fb762a6041
* Add draft model param to llama class, implement basic prompt lookup decoding draft model * Use samplingcontext for sampling * Use 1d array * Use draft model for sampling * Fix dumb mistake * Allow for later extensions to the LlamaDraftModel api * Cleanup * Adaptive candidate prediction * Update implementation to match hf transformers * Tuning * Fix bug where last token was not used for ngram prediction * Remove heuristic for num_pred_tokens (no benefit) * fix: n_candidates bug. * Add draft_model_num_pred_tokens server setting * Cleanup * Update README
1794 lines
71 KiB
Python
1794 lines
71 KiB
Python
from __future__ import annotations
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import os
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import sys
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import uuid
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import time
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import multiprocessing
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from typing import (
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List,
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Optional,
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Union,
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Generator,
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Sequence,
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Iterator,
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Deque,
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Callable,
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)
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from collections import deque
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import ctypes
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from .llama_types import *
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from .llama_grammar import LlamaGrammar
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from .llama_cache import (
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BaseLlamaCache,
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LlamaCache, # type: ignore
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LlamaDiskCache, # type: ignore
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LlamaRAMCache, # type: ignore
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)
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import llama_cpp.llama_cpp as llama_cpp
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import llama_cpp.llama_chat_format as llama_chat_format
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from llama_cpp.llama_speculative import LlamaDraftModel
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import numpy as np
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import numpy.typing as npt
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from ._utils import suppress_stdout_stderr
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from ._internals import (
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_LlamaModel, # type: ignore
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_LlamaContext, # type: ignore
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_LlamaBatch, # type: ignore
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_LlamaTokenDataArray, # type: ignore
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_LlamaSamplingParams, # type: ignore
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_LlamaSamplingContext, # type: ignore
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)
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class Llama:
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"""High-level Python wrapper for a llama.cpp model."""
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__backend_initialized = False
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def __init__(
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self,
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model_path: str,
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*,
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# Model Params
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n_gpu_layers: int = 0,
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split_mode: int = llama_cpp.LLAMA_SPLIT_LAYER,
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main_gpu: int = 0,
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tensor_split: Optional[List[float]] = None,
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vocab_only: bool = False,
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use_mmap: bool = True,
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use_mlock: bool = False,
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kv_overrides: Optional[Dict[str, Union[bool, int, float]]] = None,
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# Context Params
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seed: int = llama_cpp.LLAMA_DEFAULT_SEED,
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n_ctx: int = 512,
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n_batch: int = 512,
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n_threads: Optional[int] = None,
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n_threads_batch: Optional[int] = None,
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rope_scaling_type: Optional[int] = llama_cpp.LLAMA_ROPE_SCALING_UNSPECIFIED,
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rope_freq_base: float = 0.0,
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rope_freq_scale: float = 0.0,
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yarn_ext_factor: float = -1.0,
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yarn_attn_factor: float = 1.0,
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yarn_beta_fast: float = 32.0,
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yarn_beta_slow: float = 1.0,
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yarn_orig_ctx: int = 0,
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mul_mat_q: bool = True,
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logits_all: bool = False,
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embedding: bool = False,
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offload_kqv: bool = True,
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# Sampling Params
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last_n_tokens_size: int = 64,
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# LoRA Params
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lora_base: Optional[str] = None,
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lora_scale: float = 1.0,
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lora_path: Optional[str] = None,
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# Backend Params
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numa: bool = False,
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# Chat Format Params
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chat_format: Optional[str] = None,
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chat_handler: Optional[llama_chat_format.LlamaChatCompletionHandler] = None,
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# Speculative Decoding
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draft_model: Optional[LlamaDraftModel] = None,
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# Misc
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verbose: bool = True,
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# Extra Params
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**kwargs, # type: ignore
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):
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"""Load a llama.cpp model from `model_path`.
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Examples:
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Basic usage
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>>> import llama_cpp
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>>> model = llama_cpp.Llama(
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... model_path="path/to/model",
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... )
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>>> print(model("The quick brown fox jumps ", stop=["."])["choices"][0]["text"])
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the lazy dog
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Loading a chat model
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>>> import llama_cpp
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>>> model = llama_cpp.Llama(
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... model_path="path/to/model",
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... chat_format="llama-2",
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... )
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>>> print(model.create_chat_completion(
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... messages=[{
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... "role": "user",
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... "content": "what is the meaning of life?"
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... }]
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... ))
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Args:
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model_path: Path to the model.
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n_gpu_layers: Number of layers to offload to GPU (-ngl). If -1, all layers are offloaded.
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split_mode: How to split the model across GPUs. See llama_cpp.LLAMA_SPLIT_* for options.
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main_gpu: main_gpu interpretation depends on split_mode: LLAMA_SPLIT_NONE: the GPU that is used for the entire model. LLAMA_SPLIT_ROW: the GPU that is used for small tensors and intermediate results. LLAMA_SPLIT_LAYER: ignored
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tensor_split: How split tensors should be distributed across GPUs. If None, the model is not split.
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vocab_only: Only load the vocabulary no weights.
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use_mmap: Use mmap if possible.
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use_mlock: Force the system to keep the model in RAM.
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kv_overrides: Key-value overrides for the model.
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seed: RNG seed, -1 for random
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n_ctx: Text context, 0 = from model
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n_batch: Prompt processing maximum batch size
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n_threads: Number of threads to use for generation
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n_threads_batch: Number of threads to use for batch processing
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rope_scaling_type: RoPE scaling type, from `enum llama_rope_scaling_type`. ref: https://github.com/ggerganov/llama.cpp/pull/2054
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rope_freq_base: RoPE base frequency, 0 = from model
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rope_freq_scale: RoPE frequency scaling factor, 0 = from model
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yarn_ext_factor: YaRN extrapolation mix factor, negative = from model
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yarn_attn_factor: YaRN magnitude scaling factor
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yarn_beta_fast: YaRN low correction dim
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yarn_beta_slow: YaRN high correction dim
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yarn_orig_ctx: YaRN original context size
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logits_all: Return logits for all tokens, not just the last token. Must be True for completion to return logprobs.
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embedding: Embedding mode only.
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offload_kqv: Offload K, Q, V to GPU.
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last_n_tokens_size: Maximum number of tokens to keep in the last_n_tokens deque.
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lora_base: Optional path to base model, useful if using a quantized base model and you want to apply LoRA to an f16 model.
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lora_path: Path to a LoRA file to apply to the model.
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numa: Enable NUMA support. (NOTE: The initial value of this parameter is used for the remainder of the program as this value is set in llama_backend_init)
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chat_format: String specifying the chat format to use when calling create_chat_completion.
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chat_handler: Optional chat handler to use when calling create_chat_completion.
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draft_model: Optional draft model to use for speculative decoding.
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verbose: Print verbose output to stderr.
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Raises:
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ValueError: If the model path does not exist.
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Returns:
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A Llama instance.
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"""
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self.verbose = verbose
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self.numa = numa
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if not Llama.__backend_initialized:
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with suppress_stdout_stderr(disable=self.verbose):
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llama_cpp.llama_backend_init(self.numa)
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Llama.__backend_initialized = True
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self.model_path = model_path
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# Model Params
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self.model_params = llama_cpp.llama_model_default_params()
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self.model_params.n_gpu_layers = (
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0x7FFFFFFF if n_gpu_layers == -1 else n_gpu_layers
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) # 0x7FFFFFFF is INT32 max, will be auto set to all layers
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self.model_params.split_mode = split_mode
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self.model_params.main_gpu = main_gpu
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self.tensor_split = tensor_split
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self._c_tensor_split = None
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if self.tensor_split is not None:
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if len(self.tensor_split) > llama_cpp.LLAMA_MAX_DEVICES:
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raise ValueError(
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f"Attempt to split tensors that exceed maximum supported devices. Current LLAMA_MAX_DEVICES={llama_cpp.LLAMA_MAX_DEVICES}"
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)
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# Type conversion and expand the list to the length of LLAMA_MAX_DEVICES
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FloatArray = ctypes.c_float * llama_cpp.LLAMA_MAX_DEVICES
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self._c_tensor_split = FloatArray(
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*tensor_split # type: ignore
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) # keep a reference to the array so it is not gc'd
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self.model_params.tensor_split = self._c_tensor_split
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self.model_params.vocab_only = vocab_only
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self.model_params.use_mmap = use_mmap if lora_path is None else False
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self.model_params.use_mlock = use_mlock
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# kv_overrides is the original python dict
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self.kv_overrides = kv_overrides
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if kv_overrides is not None:
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# _kv_overrides_array is a ctypes.Array of llama_model_kv_override Structs
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kvo_array_len = len(kv_overrides) + 1 # for sentinel element
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self._kv_overrides_array = (
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llama_cpp.llama_model_kv_override * kvo_array_len
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)()
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for i, (k, v) in enumerate(kv_overrides.items()):
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self._kv_overrides_array[i].key = k.encode("utf-8")
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if isinstance(v, bool):
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self._kv_overrides_array[i].tag = llama_cpp.LLAMA_KV_OVERRIDE_BOOL
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self._kv_overrides_array[i].value.bool_value = v
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elif isinstance(v, int):
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self._kv_overrides_array[i].tag = llama_cpp.LLAMA_KV_OVERRIDE_INT
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self._kv_overrides_array[i].value.int_value = v
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elif isinstance(v, float):
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self._kv_overrides_array[i].tag = llama_cpp.LLAMA_KV_OVERRIDE_FLOAT
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self._kv_overrides_array[i].value.float_value = v
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else:
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raise ValueError(f"Unknown value type for {k}: {v}")
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self._kv_overrides_array[
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-1
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].key = b"\0" # ensure sentinel element is zeroed
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self.model_params.kv_overrides = self._kv_overrides_array
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self.n_batch = min(n_ctx, n_batch) # ???
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self.n_threads = n_threads or max(multiprocessing.cpu_count() // 2, 1)
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self.n_threads_batch = n_threads_batch or max(
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multiprocessing.cpu_count() // 2, 1
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)
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# Context Params
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self.context_params = llama_cpp.llama_context_default_params()
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self.context_params.seed = seed
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self.context_params.n_ctx = n_ctx
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self.context_params.n_batch = self.n_batch
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self.context_params.n_threads = self.n_threads
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self.context_params.n_threads_batch = self.n_threads_batch
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self.context_params.rope_scaling_type = (
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rope_scaling_type
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if rope_scaling_type is not None
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else llama_cpp.LLAMA_ROPE_SCALING_UNSPECIFIED
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)
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self.context_params.rope_freq_base = (
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rope_freq_base if rope_freq_base != 0.0 else 0
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)
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self.context_params.rope_freq_scale = (
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rope_freq_scale if rope_freq_scale != 0.0 else 0
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)
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self.context_params.yarn_ext_factor = (
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yarn_ext_factor if yarn_ext_factor != 0.0 else 0
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)
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self.context_params.yarn_attn_factor = (
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yarn_attn_factor if yarn_attn_factor != 0.0 else 0
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)
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self.context_params.yarn_beta_fast = (
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yarn_beta_fast if yarn_beta_fast != 0.0 else 0
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)
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self.context_params.yarn_beta_slow = (
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yarn_beta_slow if yarn_beta_slow != 0.0 else 0
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)
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self.context_params.yarn_orig_ctx = yarn_orig_ctx if yarn_orig_ctx != 0 else 0
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self.context_params.mul_mat_q = mul_mat_q
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self.context_params.logits_all = logits_all
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self.context_params.embedding = embedding
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self.context_params.offload_kqv = offload_kqv
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# Sampling Params
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self.last_n_tokens_size = last_n_tokens_size
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self.cache: Optional[BaseLlamaCache] = None
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self.lora_base = lora_base
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self.lora_scale = lora_scale
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self.lora_path = lora_path
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if not os.path.exists(model_path):
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raise ValueError(f"Model path does not exist: {model_path}")
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self._model = _LlamaModel(
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path_model=self.model_path, params=self.model_params, verbose=self.verbose
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)
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# Set the default value for the context and correct the batch
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if n_ctx == 0:
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n_ctx = self._model.n_ctx_train()
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self.n_batch = min(n_ctx, n_batch)
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self.context_params.n_ctx = self._model.n_ctx_train()
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self.context_params.n_batch = self.n_batch
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self._ctx = _LlamaContext(
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model=self._model,
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params=self.context_params,
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verbose=self.verbose,
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)
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self._batch = _LlamaBatch(
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n_tokens=self.n_batch,
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embd=0,
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n_seq_max=self.context_params.n_ctx,
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verbose=self.verbose,
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)
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if self.lora_path:
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if self._model.apply_lora_from_file(
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self.lora_path,
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self.lora_scale,
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self.lora_base,
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self.n_threads,
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):
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raise RuntimeError(
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f"Failed to apply LoRA from lora path: {self.lora_path} to base path: {self.lora_base}"
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)
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if self.verbose:
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print(llama_cpp.llama_print_system_info().decode("utf-8"), file=sys.stderr)
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self.chat_format = chat_format
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self.chat_handler = chat_handler
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self.draft_model = draft_model
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self._n_vocab = self.n_vocab()
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self._n_ctx = self.n_ctx()
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self._token_nl = self.token_nl()
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self._token_eos = self.token_eos()
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self._candidates = _LlamaTokenDataArray(n_vocab=self._n_vocab)
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self.n_tokens = 0
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self.input_ids: npt.NDArray[np.intc] = np.ndarray((n_ctx,), dtype=np.intc)
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self.scores: npt.NDArray[np.single] = np.ndarray(
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(n_ctx, self._n_vocab), dtype=np.single
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)
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self._mirostat_mu = ctypes.c_float(
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2.0 * 5.0
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) # TODO: Move this to sampling context
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try:
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self.metadata = self._model.metadata()
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except Exception as e:
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self.metadata = {}
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if self.verbose:
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print(f"Failed to load metadata: {e}", file=sys.stderr)
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if self.verbose:
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print(f"Model metadata: {self.metadata}", file=sys.stderr)
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if self.chat_format is None and self.chat_handler is None and "tokenizer.chat_template" in self.metadata:
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chat_format = llama_chat_format.guess_chat_format_from_gguf_metadata(self.metadata)
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if chat_format is not None:
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self.chat_format = chat_format
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if self.verbose:
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print(f"Guessed chat format: {chat_format}", file=sys.stderr)
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else:
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template = self.metadata["tokenizer.chat_template"]
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try:
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eos_token_id = int(self.metadata["tokenizer.ggml.eos_token_id"])
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except:
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eos_token_id = self.token_eos()
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try:
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bos_token_id = int(self.metadata["tokenizer.ggml.bos_token_id"])
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except:
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bos_token_id = self.token_bos()
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eos_token = self.detokenize([eos_token_id]).decode("utf-8")
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bos_token = self.detokenize([bos_token_id]).decode("utf-8")
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if self.verbose:
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print(f"Using chat template: {template}", file=sys.stderr)
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print(f"Using chat eos_token: {eos_token}", file=sys.stderr)
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print(f"Using chat bos_token: {bos_token}", file=sys.stderr)
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self.chat_handler = llama_chat_format.Jinja2ChatFormatter(
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template=template,
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eos_token=eos_token,
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bos_token=bos_token
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).to_chat_handler()
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if self.chat_format is None and self.chat_handler is None:
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self.chat_format = "llama-2"
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@property
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def ctx(self) -> llama_cpp.llama_context_p:
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assert self._ctx.ctx is not None
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return self._ctx.ctx
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@property
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def model(self) -> llama_cpp.llama_model_p:
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assert self._model.model is not None
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return self._model.model
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|
|
@property
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def _input_ids(self) -> npt.NDArray[np.intc]:
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return self.input_ids[: self.n_tokens]
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|
|
@property
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def _scores(self) -> npt.NDArray[np.single]:
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return self.scores[: self.n_tokens, :]
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|
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@property
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def eval_tokens(self) -> Deque[int]:
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return deque(self.input_ids[: self.n_tokens].tolist(), maxlen=self._n_ctx)
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|
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@property
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def eval_logits(self) -> Deque[List[float]]:
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return deque(
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self.scores[: self.n_tokens, :].tolist(),
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maxlen=self._n_ctx if self.context_params.logits_all else 1,
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)
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def tokenize(
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self, text: bytes, add_bos: bool = True, special: bool = False
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) -> List[int]:
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"""Tokenize a string.
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|
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|
Args:
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text: The utf-8 encoded string to tokenize.
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Raises:
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RuntimeError: If the tokenization failed.
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Returns:
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A list of tokens.
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"""
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return self._model.tokenize(text, add_bos, special)
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def detokenize(self, tokens: List[int]) -> bytes:
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"""Detokenize a list of tokens.
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Args:
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tokens: The list of tokens to detokenize.
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Returns:
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The detokenized string.
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"""
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return self._model.detokenize(tokens)
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def set_cache(self, cache: Optional[BaseLlamaCache]):
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"""Set the cache.
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Args:
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cache: The cache to set.
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"""
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self.cache = cache
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|
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def set_seed(self, seed: int):
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"""Set the random seed.
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Args:
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seed: The random seed.
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"""
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assert self._ctx.ctx is not None
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llama_cpp.llama_set_rng_seed(self._ctx.ctx, seed)
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|
|
def reset(self):
|
|
"""Reset the model state."""
|
|
self.n_tokens = 0
|
|
|
|
def eval(self, tokens: Sequence[int]):
|
|
"""Evaluate a list of tokens.
|
|
|
|
Args:
|
|
tokens: The list of tokens to evaluate.
|
|
"""
|
|
assert self._ctx.ctx is not None
|
|
assert self._batch.batch is not None
|
|
self._ctx.kv_cache_seq_rm(-1, self.n_tokens, -1)
|
|
for i in range(0, len(tokens), self.n_batch):
|
|
batch = tokens[i : min(len(tokens), i + self.n_batch)]
|
|
n_past = self.n_tokens
|
|
n_tokens = len(batch)
|
|
self._batch.set_batch(
|
|
batch=batch, n_past=n_past, logits_all=self.context_params.logits_all
|
|
)
|
|
self._ctx.decode(self._batch)
|
|
# Save tokens
|
|
self.input_ids[n_past : n_past + n_tokens] = batch
|
|
# Save logits
|
|
rows = n_tokens
|
|
cols = self._n_vocab
|
|
offset = (
|
|
0 if self.context_params.logits_all else n_tokens - 1
|
|
) # NOTE: Only save the last token logits if logits_all is False
|
|
self.scores[n_past + offset : n_past + n_tokens, :].reshape(-1)[
|
|
:
|
|
] = self._ctx.get_logits()[offset * cols : rows * cols]
|
|
# Update n_tokens
|
|
self.n_tokens += n_tokens
|
|
|
|
def sample(
|
|
self,
|
|
top_k: int = 40,
|
|
top_p: float = 0.95,
|
|
min_p: float = 0.05,
|
|
typical_p: float = 1.0,
|
|
temp: float = 0.80,
|
|
repeat_penalty: float = 1.1,
|
|
frequency_penalty: float = 0.0,
|
|
presence_penalty: float = 0.0,
|
|
tfs_z: float = 1.0,
|
|
mirostat_mode: int = 0,
|
|
mirostat_eta: float = 0.1,
|
|
mirostat_tau: float = 5.0,
|
|
penalize_nl: bool = True,
|
|
logits_processor: Optional[LogitsProcessorList] = None,
|
|
grammar: Optional[LlamaGrammar] = None,
|
|
idx: Optional[int] = None,
|
|
):
|
|
"""Sample a token from the model.
|
|
|
|
Args:
|
|
top_k: The top-k sampling parameter.
|
|
top_p: The top-p sampling parameter.
|
|
temp: The temperature parameter.
|
|
repeat_penalty: The repeat penalty parameter.
|
|
|
|
Returns:
|
|
The sampled token.
|
|
"""
|
|
assert self._ctx is not None
|
|
assert self.n_tokens > 0
|
|
|
|
if idx is None:
|
|
logits: npt.NDArray[np.single] = self._scores[-1, :]
|
|
else:
|
|
logits = self._scores[idx, :]
|
|
|
|
if logits_processor is not None:
|
|
logits[:] = (
|
|
logits_processor(self._input_ids, logits)
|
|
if idx is None
|
|
else logits_processor(self._input_ids[:idx], logits)
|
|
)
|
|
|
|
sampling_params = _LlamaSamplingParams(
|
|
top_k=top_k,
|
|
top_p=top_p,
|
|
min_p=min_p,
|
|
tfs_z=tfs_z,
|
|
typical_p=typical_p,
|
|
temp=temp,
|
|
penalty_last_n=self.last_n_tokens_size,
|
|
penalty_repeat=repeat_penalty,
|
|
penalty_freq=frequency_penalty,
|
|
penalty_present=presence_penalty,
|
|
mirostat=mirostat_mode,
|
|
mirostat_tau=mirostat_tau,
|
|
mirostat_eta=mirostat_eta,
|
|
penalize_nl=penalize_nl,
|
|
)
|
|
sampling_context = _LlamaSamplingContext(
|
|
params=sampling_params,
|
|
grammar=grammar,
|
|
)
|
|
sampling_context.prev = list(self.eval_tokens)
|
|
id = sampling_context.sample(ctx_main=self._ctx, logits_array=logits)
|
|
sampling_context.accept(
|
|
ctx_main=self._ctx,
|
|
id=id,
|
|
apply_grammar=grammar is not None,
|
|
)
|
|
return id
|
|
|
|
def generate(
|
|
self,
|
|
tokens: Sequence[int],
|
|
top_k: int = 40,
|
|
top_p: float = 0.95,
|
|
min_p: float = 0.05,
|
|
typical_p: float = 1.0,
|
|
temp: float = 0.80,
|
|
repeat_penalty: float = 1.1,
|
|
reset: bool = True,
|
|
frequency_penalty: float = 0.0,
|
|
presence_penalty: float = 0.0,
|
|
tfs_z: float = 1.0,
|
|
mirostat_mode: int = 0,
|
|
mirostat_tau: float = 5.0,
|
|
mirostat_eta: float = 0.1,
|
|
penalize_nl: bool = True,
|
|
logits_processor: Optional[LogitsProcessorList] = None,
|
|
stopping_criteria: Optional[StoppingCriteriaList] = None,
|
|
grammar: Optional[LlamaGrammar] = None,
|
|
) -> Generator[int, Optional[Sequence[int]], None]:
|
|
"""Create a generator of tokens from a prompt.
|
|
|
|
Examples:
|
|
>>> llama = Llama("models/ggml-7b.bin")
|
|
>>> tokens = llama.tokenize(b"Hello, world!")
|
|
>>> for token in llama.generate(tokens, top_k=40, top_p=0.95, temp=1.0, repeat_penalty=1.1):
|
|
... print(llama.detokenize([token]))
|
|
|
|
Args:
|
|
tokens: The prompt tokens.
|
|
top_k: The top-k sampling parameter.
|
|
top_p: The top-p sampling parameter.
|
|
temp: The temperature parameter.
|
|
repeat_penalty: The repeat penalty parameter.
|
|
reset: Whether to reset the model state.
|
|
|
|
Yields:
|
|
The generated tokens.
|
|
"""
|
|
# Reset mirostat sampling
|
|
self._mirostat_mu = ctypes.c_float(2.0 * mirostat_tau)
|
|
|
|
# Check for kv cache prefix match
|
|
if reset and self.n_tokens > 0:
|
|
longest_prefix = 0
|
|
for a, b in zip(self._input_ids, tokens[:-1]):
|
|
if a == b:
|
|
longest_prefix += 1
|
|
else:
|
|
break
|
|
if longest_prefix > 0:
|
|
if self.verbose:
|
|
print("Llama.generate: prefix-match hit", file=sys.stderr)
|
|
reset = False
|
|
tokens = tokens[longest_prefix:]
|
|
self.n_tokens = longest_prefix
|
|
|
|
# Reset the model state
|
|
if reset:
|
|
self.reset()
|
|
|
|
# Reset the grammar
|
|
if grammar is not None:
|
|
grammar.reset()
|
|
|
|
sample_idx = self.n_tokens + len(tokens) - 1
|
|
tokens = list(tokens)
|
|
|
|
# Eval and sample
|
|
while True:
|
|
self.eval(tokens)
|
|
while sample_idx < self.n_tokens:
|
|
token = self.sample(
|
|
top_k=top_k,
|
|
top_p=top_p,
|
|
min_p=min_p,
|
|
typical_p=typical_p,
|
|
temp=temp,
|
|
repeat_penalty=repeat_penalty,
|
|
frequency_penalty=frequency_penalty,
|
|
presence_penalty=presence_penalty,
|
|
tfs_z=tfs_z,
|
|
mirostat_mode=mirostat_mode,
|
|
mirostat_tau=mirostat_tau,
|
|
mirostat_eta=mirostat_eta,
|
|
logits_processor=logits_processor,
|
|
grammar=grammar,
|
|
penalize_nl=penalize_nl,
|
|
idx=sample_idx,
|
|
)
|
|
|
|
sample_idx += 1
|
|
if stopping_criteria is not None and stopping_criteria(
|
|
self._input_ids, self._scores[-1, :]
|
|
):
|
|
return
|
|
tokens_or_none = yield token
|
|
tokens.clear()
|
|
tokens.append(token)
|
|
if tokens_or_none is not None:
|
|
tokens.extend(tokens_or_none)
|
|
|
|
if sample_idx < self.n_tokens and token != self._input_ids[sample_idx]:
|
|
self.n_tokens = sample_idx
|
|
self._ctx.kv_cache_seq_rm(-1, self.n_tokens, -1)
|
|
break
|
|
|
|
if self.draft_model is not None:
|
|
self.input_ids[self.n_tokens : self.n_tokens + len(tokens)] = tokens
|
|
draft_tokens = self.draft_model(self.input_ids[:self.n_tokens + len(tokens)])
|
|
tokens.extend(
|
|
draft_tokens.astype(int)[
|
|
: self._n_ctx - self.n_tokens - len(tokens)
|
|
]
|
|
)
|
|
|
|
def create_embedding(
|
|
self, input: Union[str, List[str]], model: Optional[str] = None
|
|
) -> CreateEmbeddingResponse:
|
|
"""Embed a string.
|
|
|
|
Args:
|
|
input: The utf-8 encoded string to embed.
|
|
|
|
Returns:
|
|
An embedding object.
|
|
"""
|
|
assert self._ctx.ctx is not None
|
|
assert self._model.model is not None
|
|
model_name: str = model if model is not None else self.model_path
|
|
|
|
if self.context_params.embedding == False:
|
|
raise RuntimeError(
|
|
"Llama model must be created with embedding=True to call this method"
|
|
)
|
|
|
|
if self.verbose:
|
|
llama_cpp.llama_reset_timings(self._ctx.ctx)
|
|
|
|
if isinstance(input, str):
|
|
inputs = [input]
|
|
else:
|
|
inputs = input
|
|
|
|
data: List[Embedding] = []
|
|
total_tokens = 0
|
|
for index, input in enumerate(inputs):
|
|
tokens = self.tokenize(input.encode("utf-8"), special=True)
|
|
self.reset()
|
|
self.eval(tokens)
|
|
n_tokens = len(tokens)
|
|
total_tokens += n_tokens
|
|
embedding = llama_cpp.llama_get_embeddings(self._ctx.ctx)[
|
|
: llama_cpp.llama_n_embd(self._model.model)
|
|
]
|
|
|
|
data.append(
|
|
{
|
|
"object": "embedding",
|
|
"embedding": embedding,
|
|
"index": index,
|
|
}
|
|
)
|
|
if self.verbose:
|
|
llama_cpp.llama_print_timings(self._ctx.ctx)
|
|
|
|
return {
|
|
"object": "list",
|
|
"data": data,
|
|
"model": model_name,
|
|
"usage": {
|
|
"prompt_tokens": total_tokens,
|
|
"total_tokens": total_tokens,
|
|
},
|
|
}
|
|
|
|
def embed(self, input: str) -> List[float]:
|
|
"""Embed a string.
|
|
|
|
Args:
|
|
input: The utf-8 encoded string to embed.
|
|
|
|
Returns:
|
|
A list of embeddings
|
|
"""
|
|
return list(map(float, self.create_embedding(input)["data"][0]["embedding"]))
|
|
|
|
def _create_completion(
|
|
self,
|
|
prompt: Union[str, List[int]],
|
|
suffix: Optional[str] = None,
|
|
max_tokens: Optional[int] = 16,
|
|
temperature: float = 0.8,
|
|
top_p: float = 0.95,
|
|
min_p: float = 0.05,
|
|
typical_p: float = 1.0,
|
|
logprobs: Optional[int] = None,
|
|
echo: bool = False,
|
|
stop: Optional[Union[str, List[str]]] = [],
|
|
frequency_penalty: float = 0.0,
|
|
presence_penalty: float = 0.0,
|
|
repeat_penalty: float = 1.1,
|
|
top_k: int = 40,
|
|
stream: bool = False,
|
|
seed: Optional[int] = None,
|
|
tfs_z: float = 1.0,
|
|
mirostat_mode: int = 0,
|
|
mirostat_tau: float = 5.0,
|
|
mirostat_eta: float = 0.1,
|
|
model: Optional[str] = None,
|
|
stopping_criteria: Optional[StoppingCriteriaList] = None,
|
|
logits_processor: Optional[LogitsProcessorList] = None,
|
|
grammar: Optional[LlamaGrammar] = None,
|
|
logit_bias: Optional[Dict[str, float]] = None,
|
|
) -> Union[
|
|
Iterator[CreateCompletionResponse], Iterator[CreateCompletionStreamResponse]
|
|
]:
|
|
assert self._ctx is not None
|
|
assert suffix is None or suffix.__class__ is str
|
|
|
|
completion_id: str = f"cmpl-{str(uuid.uuid4())}"
|
|
created: int = int(time.time())
|
|
# If prompt is empty, initialize completion with BOS token to avoid
|
|
# detokenization including a space at the beginning of the completion
|
|
completion_tokens: List[int] = [] if len(prompt) > 0 else [self.token_bos()]
|
|
# Add blank space to start of prompt to match OG llama tokenizer
|
|
prompt_tokens: List[int] = (
|
|
(
|
|
self.tokenize(prompt.encode("utf-8"), special=True)
|
|
if prompt != ""
|
|
else [self.token_bos()]
|
|
)
|
|
if isinstance(prompt, str)
|
|
else prompt
|
|
)
|
|
text: bytes = b""
|
|
returned_tokens: int = 0
|
|
stop = (
|
|
stop if isinstance(stop, list) else [stop] if isinstance(stop, str) else []
|
|
)
|
|
model_name: str = model if model is not None else self.model_path
|
|
|
|
# NOTE: This likely doesn't work correctly for the first token in the prompt
|
|
# because of the extra space added to the start of the prompt_tokens
|
|
if logit_bias is not None:
|
|
logit_bias_map = {int(k): float(v) for k, v in logit_bias.items()}
|
|
|
|
def logit_bias_processor(
|
|
input_ids: npt.NDArray[np.intc],
|
|
scores: npt.NDArray[np.single],
|
|
) -> npt.NDArray[np.single]:
|
|
new_scores = np.copy(
|
|
scores
|
|
) # Does it make sense to copy the whole array or can we just overwrite the original one?
|
|
for input_id, score in logit_bias_map.items():
|
|
new_scores[input_id] = score + scores[input_id]
|
|
return new_scores
|
|
|
|
_logit_bias_processor = LogitsProcessorList([logit_bias_processor])
|
|
if logits_processor is None:
|
|
logits_processor = _logit_bias_processor
|
|
else:
|
|
logits_processor = logits_processor.extend(_logit_bias_processor)
|
|
|
|
if self.verbose:
|
|
self._ctx.reset_timings()
|
|
|
|
if len(prompt_tokens) >= self._n_ctx:
|
|
raise ValueError(
|
|
f"Requested tokens ({len(prompt_tokens)}) exceed context window of {llama_cpp.llama_n_ctx(self.ctx)}"
|
|
)
|
|
|
|
if max_tokens is None or max_tokens <= 0:
|
|
# Unlimited, depending on n_ctx.
|
|
max_tokens = self._n_ctx - len(prompt_tokens)
|
|
|
|
# Truncate max_tokens if requested tokens would exceed the context window
|
|
max_tokens = (
|
|
max_tokens
|
|
if max_tokens + len(prompt_tokens) < self._n_ctx
|
|
else (self._n_ctx - len(prompt_tokens))
|
|
)
|
|
|
|
if stop != []:
|
|
stop_sequences = [s.encode("utf-8") for s in stop]
|
|
else:
|
|
stop_sequences = []
|
|
|
|
if logprobs is not None and self.context_params.logits_all is False:
|
|
raise ValueError(
|
|
"logprobs is not supported for models created with logits_all=False"
|
|
)
|
|
|
|
if self.cache:
|
|
try:
|
|
cache_item = self.cache[prompt_tokens]
|
|
cache_prefix_len = Llama.longest_token_prefix(
|
|
cache_item.input_ids.tolist(), prompt_tokens
|
|
)
|
|
eval_prefix_len = Llama.longest_token_prefix(
|
|
self._input_ids.tolist(), prompt_tokens
|
|
)
|
|
if cache_prefix_len > eval_prefix_len:
|
|
self.load_state(cache_item)
|
|
if self.verbose:
|
|
print("Llama._create_completion: cache hit", file=sys.stderr)
|
|
except KeyError:
|
|
if self.verbose:
|
|
print("Llama._create_completion: cache miss", file=sys.stderr)
|
|
|
|
if seed is not None:
|
|
self._ctx.set_rng_seed(seed)
|
|
|
|
finish_reason = "length"
|
|
multibyte_fix = 0
|
|
for token in self.generate(
|
|
prompt_tokens,
|
|
top_k=top_k,
|
|
top_p=top_p,
|
|
min_p=min_p,
|
|
typical_p=typical_p,
|
|
temp=temperature,
|
|
tfs_z=tfs_z,
|
|
mirostat_mode=mirostat_mode,
|
|
mirostat_tau=mirostat_tau,
|
|
mirostat_eta=mirostat_eta,
|
|
frequency_penalty=frequency_penalty,
|
|
presence_penalty=presence_penalty,
|
|
repeat_penalty=repeat_penalty,
|
|
stopping_criteria=stopping_criteria,
|
|
logits_processor=logits_processor,
|
|
grammar=grammar,
|
|
):
|
|
if token == self._token_eos:
|
|
text = self.detokenize(completion_tokens)
|
|
finish_reason = "stop"
|
|
break
|
|
|
|
completion_tokens.append(token)
|
|
|
|
all_text = self.detokenize(completion_tokens)
|
|
|
|
# Contains multi-byte UTF8
|
|
for k, char in enumerate(all_text[-3:]):
|
|
k = 3 - k
|
|
for num, pattern in [(2, 192), (3, 224), (4, 240)]:
|
|
# Bitwise AND check
|
|
if num > k and pattern & char == pattern:
|
|
multibyte_fix = num - k
|
|
|
|
# Stop incomplete bytes from passing
|
|
if multibyte_fix > 0:
|
|
multibyte_fix -= 1
|
|
continue
|
|
|
|
any_stop = [s for s in stop_sequences if s in all_text]
|
|
if len(any_stop) > 0:
|
|
first_stop = any_stop[0]
|
|
text = all_text[: all_text.index(first_stop)]
|
|
finish_reason = "stop"
|
|
break
|
|
|
|
if stream:
|
|
remaining_tokens = completion_tokens[returned_tokens:]
|
|
remaining_text = self.detokenize(remaining_tokens)
|
|
remaining_length = len(remaining_text)
|
|
|
|
# We want to avoid yielding any characters from
|
|
# the generated text if they are part of a stop
|
|
# sequence.
|
|
first_stop_position = 0
|
|
for s in stop_sequences:
|
|
for i in range(min(len(s), remaining_length), 0, -1):
|
|
if remaining_text.endswith(s[:i]):
|
|
if i > first_stop_position:
|
|
first_stop_position = i
|
|
break
|
|
|
|
token_end_position = 0
|
|
|
|
if logprobs is not None:
|
|
# not sure how to handle this branch when dealing
|
|
# with CJK output, so keep it unchanged
|
|
for token in remaining_tokens:
|
|
if token == self.token_bos():
|
|
continue
|
|
token_end_position += len(self.detokenize([token]))
|
|
# Check if stop sequence is in the token
|
|
if token_end_position > (
|
|
remaining_length - first_stop_position
|
|
):
|
|
break
|
|
token_str = self.detokenize([token]).decode(
|
|
"utf-8", errors="ignore"
|
|
)
|
|
text_offset = len(prompt) + len(
|
|
self.detokenize(completion_tokens[:returned_tokens]).decode(
|
|
"utf-8", errors="ignore"
|
|
)
|
|
)
|
|
token_offset = len(prompt_tokens) + returned_tokens
|
|
logits = self._scores[token_offset - 1, :]
|
|
current_logprobs = Llama.logits_to_logprobs(logits).tolist()
|
|
sorted_logprobs = list(
|
|
sorted(
|
|
zip(current_logprobs, range(len(current_logprobs))),
|
|
reverse=True,
|
|
)
|
|
)
|
|
top_logprob = {
|
|
self.detokenize([i]).decode(
|
|
"utf-8", errors="ignore"
|
|
): logprob
|
|
for logprob, i in sorted_logprobs[:logprobs]
|
|
}
|
|
top_logprob.update({token_str: current_logprobs[int(token)]})
|
|
logprobs_or_none = {
|
|
"tokens": [
|
|
self.detokenize([token]).decode(
|
|
"utf-8", errors="ignore"
|
|
)
|
|
],
|
|
"text_offset": [text_offset],
|
|
"token_logprobs": [current_logprobs[int(token)]],
|
|
"top_logprobs": [top_logprob],
|
|
}
|
|
returned_tokens += 1
|
|
yield {
|
|
"id": completion_id,
|
|
"object": "text_completion",
|
|
"created": created,
|
|
"model": model_name,
|
|
"choices": [
|
|
{
|
|
"text": self.detokenize([token]).decode(
|
|
"utf-8", errors="ignore"
|
|
),
|
|
"index": 0,
|
|
"logprobs": logprobs_or_none,
|
|
"finish_reason": None,
|
|
}
|
|
],
|
|
}
|
|
else:
|
|
while len(remaining_tokens) > 0:
|
|
decode_success = False
|
|
for i in range(1, len(remaining_tokens) + 1):
|
|
try:
|
|
bs = self.detokenize(remaining_tokens[:i])
|
|
ts = bs.decode("utf-8")
|
|
decode_success = True
|
|
break
|
|
except UnicodeError:
|
|
pass
|
|
else:
|
|
break
|
|
if not decode_success:
|
|
# all remaining tokens cannot be decoded to a UTF-8 character
|
|
break
|
|
token_end_position += len(bs)
|
|
if token_end_position > (
|
|
remaining_length - first_stop_position
|
|
):
|
|
break
|
|
remaining_tokens = remaining_tokens[i:]
|
|
returned_tokens += i
|
|
|
|
yield {
|
|
"id": completion_id,
|
|
"object": "text_completion",
|
|
"created": created,
|
|
"model": model_name,
|
|
"choices": [
|
|
{
|
|
"text": ts,
|
|
"index": 0,
|
|
"logprobs": None,
|
|
"finish_reason": None,
|
|
}
|
|
],
|
|
}
|
|
|
|
if len(completion_tokens) >= max_tokens:
|
|
text = self.detokenize(completion_tokens)
|
|
finish_reason = "length"
|
|
break
|
|
|
|
if stopping_criteria is not None and stopping_criteria(
|
|
self._input_ids, self._scores[-1, :]
|
|
):
|
|
text = self.detokenize(completion_tokens)
|
|
finish_reason = "stop"
|
|
|
|
if self.verbose:
|
|
self._ctx.print_timings()
|
|
|
|
if stream:
|
|
remaining_tokens = completion_tokens[returned_tokens:]
|
|
all_text = self.detokenize(remaining_tokens)
|
|
any_stop = [s for s in stop_sequences if s in all_text]
|
|
if len(any_stop) > 0:
|
|
end = min(all_text.index(stop) for stop in any_stop)
|
|
else:
|
|
end = len(all_text)
|
|
|
|
token_end_position = 0
|
|
for token in remaining_tokens:
|
|
token_end_position += len(self.detokenize([token]))
|
|
|
|
logprobs_or_none: Optional[CompletionLogprobs] = None
|
|
if logprobs is not None:
|
|
if token == self.token_bos():
|
|
continue
|
|
token_str = self.detokenize([token]).decode(
|
|
"utf-8", errors="ignore"
|
|
)
|
|
text_offset = len(prompt) + len(
|
|
self.detokenize(completion_tokens[:returned_tokens])
|
|
)
|
|
token_offset = len(prompt_tokens) + returned_tokens - 1
|
|
logits = self._scores[token_offset, :]
|
|
current_logprobs = Llama.logits_to_logprobs(logits).tolist()
|
|
sorted_logprobs = list(
|
|
sorted(
|
|
zip(current_logprobs, range(len(current_logprobs))),
|
|
reverse=True,
|
|
)
|
|
)
|
|
top_logprob = {
|
|
self.detokenize([i]).decode("utf-8", errors="ignore"): logprob
|
|
for logprob, i in sorted_logprobs[:logprobs]
|
|
}
|
|
top_logprob.update({token_str: current_logprobs[int(token)]})
|
|
logprobs_or_none = {
|
|
"tokens": [
|
|
self.detokenize([token]).decode("utf-8", errors="ignore")
|
|
],
|
|
"text_offset": [text_offset],
|
|
"token_logprobs": [current_logprobs[int(token)]],
|
|
"top_logprobs": [top_logprob],
|
|
}
|
|
|
|
if token_end_position >= end:
|
|
last_text = self.detokenize([token])
|
|
if token_end_position == end - 1:
|
|
break
|
|
returned_tokens += 1
|
|
yield {
|
|
"id": completion_id,
|
|
"object": "text_completion",
|
|
"created": created,
|
|
"model": model_name,
|
|
"choices": [
|
|
{
|
|
"text": last_text[
|
|
: len(last_text) - (token_end_position - end)
|
|
].decode("utf-8", errors="ignore"),
|
|
"index": 0,
|
|
"logprobs": logprobs_or_none,
|
|
"finish_reason": None,
|
|
}
|
|
],
|
|
}
|
|
break
|
|
returned_tokens += 1
|
|
yield {
|
|
"id": completion_id,
|
|
"object": "text_completion",
|
|
"created": created,
|
|
"model": model_name,
|
|
"choices": [
|
|
{
|
|
"text": self.detokenize([token]).decode(
|
|
"utf-8", errors="ignore"
|
|
),
|
|
"index": 0,
|
|
"logprobs": logprobs_or_none,
|
|
"finish_reason": None,
|
|
}
|
|
],
|
|
}
|
|
yield {
|
|
"id": completion_id,
|
|
"object": "text_completion",
|
|
"created": created,
|
|
"model": model_name,
|
|
"choices": [
|
|
{
|
|
"text": "",
|
|
"index": 0,
|
|
"logprobs": None,
|
|
"finish_reason": finish_reason,
|
|
}
|
|
],
|
|
}
|
|
if self.cache:
|
|
if self.verbose:
|
|
print("Llama._create_completion: cache save", file=sys.stderr)
|
|
self.cache[prompt_tokens + completion_tokens] = self.save_state()
|
|
print("Llama._create_completion: cache saved", file=sys.stderr)
|
|
return
|
|
|
|
if self.cache:
|
|
if self.verbose:
|
|
print("Llama._create_completion: cache save", file=sys.stderr)
|
|
self.cache[prompt_tokens + completion_tokens] = self.save_state()
|
|
|
|
text_str = text.decode("utf-8", errors="ignore")
|
|
|
|
if echo:
|
|
text_str = prompt + text_str
|
|
|
|
if suffix is not None:
|
|
text_str = text_str + suffix
|
|
|
|
logprobs_or_none: Optional[CompletionLogprobs] = None
|
|
if logprobs is not None:
|
|
text_offset = 0 if echo else len(prompt)
|
|
token_offset = 0 if echo else len(prompt_tokens[1:])
|
|
text_offsets: List[int] = []
|
|
token_logprobs: List[Optional[float]] = []
|
|
tokens: List[str] = []
|
|
top_logprobs: List[Optional[Dict[str, float]]] = []
|
|
|
|
if echo:
|
|
# Remove leading BOS token
|
|
all_tokens = prompt_tokens[1:] + completion_tokens
|
|
else:
|
|
all_tokens = completion_tokens
|
|
|
|
all_token_strs = [
|
|
self.detokenize([token]).decode("utf-8", errors="ignore")
|
|
for token in all_tokens
|
|
]
|
|
all_logprobs = Llama.logits_to_logprobs(self._scores)[token_offset:]
|
|
# TODO: may be able to change this loop to use np.take_along_dim
|
|
for idx, (token, token_str, logprobs_token) in enumerate(
|
|
zip(all_tokens, all_token_strs, all_logprobs)
|
|
):
|
|
if token == self.token_bos():
|
|
continue
|
|
text_offsets.append(
|
|
text_offset
|
|
+ len(
|
|
self.detokenize(all_tokens[:idx]).decode(
|
|
"utf-8", errors="ignore"
|
|
)
|
|
)
|
|
)
|
|
tokens.append(token_str)
|
|
sorted_logprobs = list(
|
|
sorted(
|
|
zip(logprobs_token, range(len(logprobs_token))), reverse=True
|
|
)
|
|
)
|
|
token_logprobs.append(logprobs_token[int(token)])
|
|
top_logprob: Optional[Dict[str, float]] = {
|
|
self.detokenize([i]).decode("utf-8", errors="ignore"): logprob
|
|
for logprob, i in sorted_logprobs[:logprobs]
|
|
}
|
|
top_logprob.update({token_str: logprobs_token[int(token)]})
|
|
top_logprobs.append(top_logprob)
|
|
# Weird idosincracy of the OpenAI API where
|
|
# token_logprobs and top_logprobs are null for
|
|
# the first token.
|
|
if echo and len(all_tokens) > 0:
|
|
token_logprobs[0] = None
|
|
top_logprobs[0] = None
|
|
logprobs_or_none = {
|
|
"tokens": tokens,
|
|
"text_offset": text_offsets,
|
|
"token_logprobs": token_logprobs,
|
|
"top_logprobs": top_logprobs,
|
|
}
|
|
|
|
yield {
|
|
"id": completion_id,
|
|
"object": "text_completion",
|
|
"created": created,
|
|
"model": model_name,
|
|
"choices": [
|
|
{
|
|
"text": text_str,
|
|
"index": 0,
|
|
"logprobs": logprobs_or_none,
|
|
"finish_reason": finish_reason,
|
|
}
|
|
],
|
|
"usage": {
|
|
"prompt_tokens": len(prompt_tokens),
|
|
"completion_tokens": len(completion_tokens),
|
|
"total_tokens": len(prompt_tokens) + len(completion_tokens),
|
|
},
|
|
}
|
|
|
|
def create_completion(
|
|
self,
|
|
prompt: Union[str, List[int]],
|
|
suffix: Optional[str] = None,
|
|
max_tokens: Optional[int] = 16,
|
|
temperature: float = 0.8,
|
|
top_p: float = 0.95,
|
|
min_p: float = 0.05,
|
|
typical_p: float = 1.0,
|
|
logprobs: Optional[int] = None,
|
|
echo: bool = False,
|
|
stop: Optional[Union[str, List[str]]] = [],
|
|
frequency_penalty: float = 0.0,
|
|
presence_penalty: float = 0.0,
|
|
repeat_penalty: float = 1.1,
|
|
top_k: int = 40,
|
|
stream: bool = False,
|
|
seed: Optional[int] = None,
|
|
tfs_z: float = 1.0,
|
|
mirostat_mode: int = 0,
|
|
mirostat_tau: float = 5.0,
|
|
mirostat_eta: float = 0.1,
|
|
model: Optional[str] = None,
|
|
stopping_criteria: Optional[StoppingCriteriaList] = None,
|
|
logits_processor: Optional[LogitsProcessorList] = None,
|
|
grammar: Optional[LlamaGrammar] = None,
|
|
logit_bias: Optional[Dict[str, float]] = None,
|
|
) -> Union[CreateCompletionResponse, Iterator[CreateCompletionStreamResponse]]:
|
|
"""Generate text from a prompt.
|
|
|
|
Args:
|
|
prompt: The prompt to generate text from.
|
|
suffix: A suffix to append to the generated text. If None, no suffix is appended.
|
|
max_tokens: The maximum number of tokens to generate. If max_tokens <= 0 or None, the maximum number of tokens to generate is unlimited and depends on n_ctx.
|
|
temperature: The temperature to use for sampling.
|
|
top_p: The top-p value to use for nucleus sampling. Nucleus sampling described in academic paper "The Curious Case of Neural Text Degeneration" https://arxiv.org/abs/1904.09751
|
|
min_p: The min-p value to use for minimum p sampling. Minimum P sampling as described in https://github.com/ggerganov/llama.cpp/pull/3841
|
|
typical_p: The typical-p value to use for sampling. Locally Typical Sampling implementation described in the paper https://arxiv.org/abs/2202.00666.
|
|
logprobs: The number of logprobs to return. If None, no logprobs are returned.
|
|
echo: Whether to echo the prompt.
|
|
stop: A list of strings to stop generation when encountered.
|
|
frequency_penalty: The penalty to apply to tokens based on their frequency in the prompt.
|
|
presence_penalty: The penalty to apply to tokens based on their presence in the prompt.
|
|
repeat_penalty: The penalty to apply to repeated tokens.
|
|
top_k: The top-k value to use for sampling. Top-K sampling described in academic paper "The Curious Case of Neural Text Degeneration" https://arxiv.org/abs/1904.09751
|
|
stream: Whether to stream the results.
|
|
seed: The seed to use for sampling.
|
|
tfs_z: The tail-free sampling parameter. Tail Free Sampling described in https://www.trentonbricken.com/Tail-Free-Sampling/.
|
|
mirostat_mode: The mirostat sampling mode.
|
|
mirostat_tau: The target cross-entropy (or surprise) value you want to achieve for the generated text. A higher value corresponds to more surprising or less predictable text, while a lower value corresponds to less surprising or more predictable text.
|
|
mirostat_eta: The learning rate used to update `mu` based on the error between the target and observed surprisal of the sampled word. A larger learning rate will cause `mu` to be updated more quickly, while a smaller learning rate will result in slower updates.
|
|
model: The name to use for the model in the completion object.
|
|
stopping_criteria: A list of stopping criteria to use.
|
|
logits_processor: A list of logits processors to use.
|
|
grammar: A grammar to use for constrained sampling.
|
|
logit_bias: A logit bias to use.
|
|
|
|
Raises:
|
|
ValueError: If the requested tokens exceed the context window.
|
|
RuntimeError: If the prompt fails to tokenize or the model fails to evaluate the prompt.
|
|
|
|
Returns:
|
|
Response object containing the generated text.
|
|
"""
|
|
completion_or_chunks = self._create_completion(
|
|
prompt=prompt,
|
|
suffix=suffix,
|
|
max_tokens=-1 if max_tokens is None else max_tokens,
|
|
temperature=temperature,
|
|
top_p=top_p,
|
|
min_p=min_p,
|
|
typical_p=typical_p,
|
|
logprobs=logprobs,
|
|
echo=echo,
|
|
stop=stop,
|
|
frequency_penalty=frequency_penalty,
|
|
presence_penalty=presence_penalty,
|
|
repeat_penalty=repeat_penalty,
|
|
top_k=top_k,
|
|
stream=stream,
|
|
seed=seed,
|
|
tfs_z=tfs_z,
|
|
mirostat_mode=mirostat_mode,
|
|
mirostat_tau=mirostat_tau,
|
|
mirostat_eta=mirostat_eta,
|
|
model=model,
|
|
stopping_criteria=stopping_criteria,
|
|
logits_processor=logits_processor,
|
|
grammar=grammar,
|
|
logit_bias=logit_bias,
|
|
)
|
|
if stream:
|
|
chunks: Iterator[CreateCompletionStreamResponse] = completion_or_chunks
|
|
return chunks
|
|
completion: Completion = next(completion_or_chunks) # type: ignore
|
|
return completion
|
|
|
|
def __call__(
|
|
self,
|
|
prompt: str,
|
|
suffix: Optional[str] = None,
|
|
max_tokens: Optional[int] = 16,
|
|
temperature: float = 0.8,
|
|
top_p: float = 0.95,
|
|
min_p: float = 0.05,
|
|
typical_p: float = 1.0,
|
|
logprobs: Optional[int] = None,
|
|
echo: bool = False,
|
|
stop: Optional[Union[str, List[str]]] = [],
|
|
frequency_penalty: float = 0.0,
|
|
presence_penalty: float = 0.0,
|
|
repeat_penalty: float = 1.1,
|
|
top_k: int = 40,
|
|
stream: bool = False,
|
|
seed: Optional[int] = None,
|
|
tfs_z: float = 1.0,
|
|
mirostat_mode: int = 0,
|
|
mirostat_tau: float = 5.0,
|
|
mirostat_eta: float = 0.1,
|
|
model: Optional[str] = None,
|
|
stopping_criteria: Optional[StoppingCriteriaList] = None,
|
|
logits_processor: Optional[LogitsProcessorList] = None,
|
|
grammar: Optional[LlamaGrammar] = None,
|
|
logit_bias: Optional[Dict[str, float]] = None,
|
|
) -> Union[CreateCompletionResponse, Iterator[CreateCompletionStreamResponse]]:
|
|
"""Generate text from a prompt.
|
|
|
|
Args:
|
|
prompt: The prompt to generate text from.
|
|
suffix: A suffix to append to the generated text. If None, no suffix is appended.
|
|
max_tokens: The maximum number of tokens to generate. If max_tokens <= 0 or None, the maximum number of tokens to generate is unlimited and depends on n_ctx.
|
|
temperature: The temperature to use for sampling.
|
|
top_p: The top-p value to use for nucleus sampling. Nucleus sampling described in academic paper "The Curious Case of Neural Text Degeneration" https://arxiv.org/abs/1904.09751
|
|
min_p: The min-p value to use for minimum p sampling. Minimum P sampling as described in https://github.com/ggerganov/llama.cpp/pull/3841
|
|
typical_p: The typical-p value to use for sampling. Locally Typical Sampling implementation described in the paper https://arxiv.org/abs/2202.00666.
|
|
logprobs: The number of logprobs to return. If None, no logprobs are returned.
|
|
echo: Whether to echo the prompt.
|
|
stop: A list of strings to stop generation when encountered.
|
|
frequency_penalty: The penalty to apply to tokens based on their frequency in the prompt.
|
|
presence_penalty: The penalty to apply to tokens based on their presence in the prompt.
|
|
repeat_penalty: The penalty to apply to repeated tokens.
|
|
top_k: The top-k value to use for sampling. Top-K sampling described in academic paper "The Curious Case of Neural Text Degeneration" https://arxiv.org/abs/1904.09751
|
|
stream: Whether to stream the results.
|
|
seed: The seed to use for sampling.
|
|
tfs_z: The tail-free sampling parameter. Tail Free Sampling described in https://www.trentonbricken.com/Tail-Free-Sampling/.
|
|
mirostat_mode: The mirostat sampling mode.
|
|
mirostat_tau: The target cross-entropy (or surprise) value you want to achieve for the generated text. A higher value corresponds to more surprising or less predictable text, while a lower value corresponds to less surprising or more predictable text.
|
|
mirostat_eta: The learning rate used to update `mu` based on the error between the target and observed surprisal of the sampled word. A larger learning rate will cause `mu` to be updated more quickly, while a smaller learning rate will result in slower updates.
|
|
model: The name to use for the model in the completion object.
|
|
stopping_criteria: A list of stopping criteria to use.
|
|
logits_processor: A list of logits processors to use.
|
|
grammar: A grammar to use for constrained sampling.
|
|
logit_bias: A logit bias to use.
|
|
|
|
Raises:
|
|
ValueError: If the requested tokens exceed the context window.
|
|
RuntimeError: If the prompt fails to tokenize or the model fails to evaluate the prompt.
|
|
|
|
Returns:
|
|
Response object containing the generated text.
|
|
"""
|
|
return self.create_completion(
|
|
prompt=prompt,
|
|
suffix=suffix,
|
|
max_tokens=max_tokens,
|
|
temperature=temperature,
|
|
top_p=top_p,
|
|
min_p=min_p,
|
|
typical_p=typical_p,
|
|
logprobs=logprobs,
|
|
echo=echo,
|
|
stop=stop,
|
|
frequency_penalty=frequency_penalty,
|
|
presence_penalty=presence_penalty,
|
|
repeat_penalty=repeat_penalty,
|
|
top_k=top_k,
|
|
stream=stream,
|
|
seed=seed,
|
|
tfs_z=tfs_z,
|
|
mirostat_mode=mirostat_mode,
|
|
mirostat_tau=mirostat_tau,
|
|
mirostat_eta=mirostat_eta,
|
|
model=model,
|
|
stopping_criteria=stopping_criteria,
|
|
logits_processor=logits_processor,
|
|
grammar=grammar,
|
|
logit_bias=logit_bias,
|
|
)
|
|
|
|
def create_chat_completion(
|
|
self,
|
|
messages: List[ChatCompletionRequestMessage],
|
|
functions: Optional[List[ChatCompletionFunction]] = None,
|
|
function_call: Optional[ChatCompletionRequestFunctionCall] = None,
|
|
tools: Optional[List[ChatCompletionTool]] = None,
|
|
tool_choice: Optional[ChatCompletionToolChoiceOption] = None,
|
|
temperature: float = 0.2,
|
|
top_p: float = 0.95,
|
|
top_k: int = 40,
|
|
min_p: float = 0.05,
|
|
typical_p: float = 1.0,
|
|
stream: bool = False,
|
|
stop: Optional[Union[str, List[str]]] = [],
|
|
seed: Optional[int] = None,
|
|
response_format: Optional[ChatCompletionRequestResponseFormat] = None,
|
|
max_tokens: Optional[int] = None,
|
|
presence_penalty: float = 0.0,
|
|
frequency_penalty: float = 0.0,
|
|
repeat_penalty: float = 1.1,
|
|
tfs_z: float = 1.0,
|
|
mirostat_mode: int = 0,
|
|
mirostat_tau: float = 5.0,
|
|
mirostat_eta: float = 0.1,
|
|
model: Optional[str] = None,
|
|
logits_processor: Optional[LogitsProcessorList] = None,
|
|
grammar: Optional[LlamaGrammar] = None,
|
|
logit_bias: Optional[Dict[str, float]] = None,
|
|
) -> Union[
|
|
CreateChatCompletionResponse, Iterator[CreateChatCompletionStreamResponse]
|
|
]:
|
|
"""Generate a chat completion from a list of messages.
|
|
|
|
Args:
|
|
messages: A list of messages to generate a response for.
|
|
functions: A list of functions to use for the chat completion.
|
|
function_call: A function call to use for the chat completion.
|
|
tools: A list of tools to use for the chat completion.
|
|
tool_choice: A tool choice to use for the chat completion.
|
|
temperature: The temperature to use for sampling.
|
|
top_p: The top-p value to use for nucleus sampling. Nucleus sampling described in academic paper "The Curious Case of Neural Text Degeneration" https://arxiv.org/abs/1904.09751
|
|
top_k: The top-k value to use for sampling. Top-K sampling described in academic paper "The Curious Case of Neural Text Degeneration" https://arxiv.org/abs/1904.09751
|
|
min_p: The min-p value to use for minimum p sampling. Minimum P sampling as described in https://github.com/ggerganov/llama.cpp/pull/3841
|
|
typical_p: The typical-p value to use for sampling. Locally Typical Sampling implementation described in the paper https://arxiv.org/abs/2202.00666.
|
|
stream: Whether to stream the results.
|
|
stop: A list of strings to stop generation when encountered.
|
|
seed: The seed to use for sampling.
|
|
response_format: The response format to use for the chat completion. Use { "type": "json_object" } to contstrain output to only valid json.
|
|
max_tokens: The maximum number of tokens to generate. If max_tokens <= 0 or None, the maximum number of tokens to generate is unlimited and depends on n_ctx.
|
|
presence_penalty: The penalty to apply to tokens based on their presence in the prompt.
|
|
frequency_penalty: The penalty to apply to tokens based on their frequency in the prompt.
|
|
repeat_penalty: The penalty to apply to repeated tokens.
|
|
tfs_z: The tail-free sampling parameter.
|
|
mirostat_mode: The mirostat sampling mode.
|
|
mirostat_tau: The mirostat sampling tau parameter.
|
|
mirostat_eta: The mirostat sampling eta parameter.
|
|
model: The name to use for the model in the completion object.
|
|
logits_processor: A list of logits processors to use.
|
|
grammar: A grammar to use.
|
|
logit_bias: A logit bias to use.
|
|
|
|
Returns:
|
|
Generated chat completion or a stream of chat completion chunks.
|
|
"""
|
|
handler = self.chat_handler or llama_chat_format.get_chat_completion_handler(
|
|
self.chat_format
|
|
)
|
|
return handler(
|
|
llama=self,
|
|
messages=messages,
|
|
functions=functions,
|
|
function_call=function_call,
|
|
tools=tools,
|
|
tool_choice=tool_choice,
|
|
temperature=temperature,
|
|
top_p=top_p,
|
|
top_k=top_k,
|
|
min_p=min_p,
|
|
typical_p=typical_p,
|
|
stream=stream,
|
|
stop=stop,
|
|
seed=seed,
|
|
response_format=response_format,
|
|
max_tokens=max_tokens,
|
|
presence_penalty=presence_penalty,
|
|
frequency_penalty=frequency_penalty,
|
|
repeat_penalty=repeat_penalty,
|
|
tfs_z=tfs_z,
|
|
mirostat_mode=mirostat_mode,
|
|
mirostat_tau=mirostat_tau,
|
|
mirostat_eta=mirostat_eta,
|
|
model=model,
|
|
logits_processor=logits_processor,
|
|
grammar=grammar,
|
|
logit_bias=logit_bias,
|
|
)
|
|
|
|
def __getstate__(self):
|
|
return dict(
|
|
model_path=self.model_path,
|
|
# Model Params
|
|
n_gpu_layers=self.model_params.n_gpu_layers,
|
|
split_mode=self.model_params.split_mode,
|
|
main_gpu=self.model_params.main_gpu,
|
|
tensor_split=self.tensor_split,
|
|
vocab_only=self.model_params.vocab_only,
|
|
use_mmap=self.model_params.use_mmap,
|
|
use_mlock=self.model_params.use_mlock,
|
|
kv_overrides=self.kv_overrides,
|
|
# Context Params
|
|
seed=self.context_params.seed,
|
|
n_ctx=self.context_params.n_ctx,
|
|
n_batch=self.n_batch,
|
|
n_threads=self.context_params.n_threads,
|
|
n_threads_batch=self.context_params.n_threads_batch,
|
|
rope_scaling_type=self.context_params.rope_scaling_type,
|
|
rope_freq_base=self.context_params.rope_freq_base,
|
|
rope_freq_scale=self.context_params.rope_freq_scale,
|
|
yarn_ext_factor=self.context_params.yarn_ext_factor,
|
|
yarn_attn_factor=self.context_params.yarn_attn_factor,
|
|
yarn_beta_fast=self.context_params.yarn_beta_fast,
|
|
yarn_beta_slow=self.context_params.yarn_beta_slow,
|
|
yarn_orig_ctx=self.context_params.yarn_orig_ctx,
|
|
mul_mat_q=self.context_params.mul_mat_q,
|
|
logits_all=self.context_params.logits_all,
|
|
embedding=self.context_params.embedding,
|
|
# Sampling Params
|
|
last_n_tokens_size=self.last_n_tokens_size,
|
|
# LoRA Params
|
|
lora_base=self.lora_base,
|
|
lora_scale=self.lora_scale,
|
|
lora_path=self.lora_path,
|
|
# Backend Params
|
|
numa=self.numa,
|
|
# Chat Format Params
|
|
chat_format=self.chat_format,
|
|
chat_handler=self.chat_handler,
|
|
# Misc
|
|
verbose=self.verbose,
|
|
)
|
|
|
|
def __setstate__(self, state):
|
|
self.__init__(
|
|
model_path=state["model_path"],
|
|
# Model Params
|
|
n_gpu_layers=state["n_gpu_layers"],
|
|
split_mode=state["split_mode"],
|
|
main_gpu=state["main_gpu"],
|
|
tensor_split=state["tensor_split"],
|
|
vocab_only=state["vocab_only"],
|
|
use_mmap=state["use_mmap"],
|
|
use_mlock=state["use_mlock"],
|
|
kv_overrides=state["kv_overrides"],
|
|
# Context Params
|
|
seed=state["seed"],
|
|
n_ctx=state["n_ctx"],
|
|
n_batch=state["n_batch"],
|
|
n_threads=state["n_threads"],
|
|
n_threads_batch=state["n_threads_batch"],
|
|
rope_freq_base=state["rope_freq_base"],
|
|
rope_freq_scale=state["rope_freq_scale"],
|
|
rope_scaling_type=state["rope_scaling_type"],
|
|
yarn_ext_factor=state["yarn_ext_factor"],
|
|
yarn_attn_factor=state["yarn_attn_factor"],
|
|
yarn_beta_fast=state["yarn_beta_fast"],
|
|
yarn_beta_slow=state["yarn_beta_slow"],
|
|
yarn_orig_ctx=state["yarn_orig_ctx"],
|
|
mul_mat_q=state["mul_mat_q"],
|
|
logits_all=state["logits_all"],
|
|
embedding=state["embedding"],
|
|
# Sampling Params
|
|
last_n_tokens_size=state["last_n_tokens_size"],
|
|
# LoRA Params
|
|
lora_base=state["lora_base"],
|
|
lora_path=state["lora_path"],
|
|
# Backend Params
|
|
numa=state["numa"],
|
|
# Chat Format Params
|
|
chat_format=state["chat_format"],
|
|
chat_handler=state["chat_handler"],
|
|
# Misc
|
|
verbose=state["verbose"],
|
|
)
|
|
|
|
def save_state(self) -> LlamaState:
|
|
assert self._ctx.ctx is not None
|
|
if self.verbose:
|
|
print("Llama.save_state: saving llama state", file=sys.stderr)
|
|
state_size = llama_cpp.llama_get_state_size(self._ctx.ctx)
|
|
if self.verbose:
|
|
print(f"Llama.save_state: got state size: {state_size}", file=sys.stderr)
|
|
llama_state = (llama_cpp.c_uint8 * int(state_size))()
|
|
if self.verbose:
|
|
print("Llama.save_state: allocated state", file=sys.stderr)
|
|
n_bytes = llama_cpp.llama_copy_state_data(self._ctx.ctx, llama_state)
|
|
if self.verbose:
|
|
print(f"Llama.save_state: copied llama state: {n_bytes}", file=sys.stderr)
|
|
if int(n_bytes) > int(state_size):
|
|
raise RuntimeError("Failed to copy llama state data")
|
|
llama_state_compact = (llama_cpp.c_uint8 * int(n_bytes))()
|
|
llama_cpp.ctypes.memmove(llama_state_compact, llama_state, int(n_bytes))
|
|
if self.verbose:
|
|
print(
|
|
f"Llama.save_state: saving {n_bytes} bytes of llama state",
|
|
file=sys.stderr,
|
|
)
|
|
return LlamaState(
|
|
scores=self.scores.copy(),
|
|
input_ids=self.input_ids.copy(),
|
|
n_tokens=self.n_tokens,
|
|
llama_state=bytes(llama_state_compact),
|
|
llama_state_size=n_bytes,
|
|
)
|
|
|
|
def load_state(self, state: LlamaState) -> None:
|
|
assert self._ctx.ctx is not None
|
|
self.scores = state.scores.copy()
|
|
self.input_ids = state.input_ids.copy()
|
|
self.n_tokens = state.n_tokens
|
|
state_size = state.llama_state_size
|
|
LLamaStateArrayType = llama_cpp.c_uint8 * state_size
|
|
llama_state = LLamaStateArrayType.from_buffer_copy(state.llama_state)
|
|
|
|
if llama_cpp.llama_set_state_data(self._ctx.ctx, llama_state) != state_size:
|
|
raise RuntimeError("Failed to set llama state data")
|
|
|
|
def n_ctx(self) -> int:
|
|
"""Return the context window size."""
|
|
return self._ctx.n_ctx()
|
|
|
|
def n_embd(self) -> int:
|
|
"""Return the embedding size."""
|
|
return self._model.n_embd()
|
|
|
|
def n_vocab(self) -> int:
|
|
"""Return the vocabulary size."""
|
|
return self._model.n_vocab()
|
|
|
|
def tokenizer(self) -> "LlamaTokenizer":
|
|
"""Return the tokenizer for this model."""
|
|
return LlamaTokenizer(self)
|
|
|
|
def token_eos(self) -> int:
|
|
"""Return the end-of-sequence token."""
|
|
return self._model.token_eos()
|
|
|
|
def token_bos(self) -> int:
|
|
"""Return the beginning-of-sequence token."""
|
|
return self._model.token_bos()
|
|
|
|
def token_nl(self) -> int:
|
|
"""Return the newline token."""
|
|
return self._model.token_nl()
|
|
|
|
@staticmethod
|
|
def logits_to_logprobs(
|
|
logits: Union[npt.NDArray[np.single], List], axis: int = -1
|
|
) -> npt.NDArray[np.single]:
|
|
# https://docs.scipy.org/doc/scipy/reference/generated/scipy.special.log_softmax.html
|
|
logits_maxs: np.ndarray = np.amax(logits, axis=axis, keepdims=True)
|
|
if logits_maxs.ndim > 0:
|
|
logits_maxs[~np.isfinite(logits_maxs)] = 0
|
|
elif not np.isfinite(logits_maxs):
|
|
logits_maxs = 0
|
|
subtract_maxs = np.subtract(logits, logits_maxs, dtype=np.single)
|
|
exp = np.exp(subtract_maxs)
|
|
# Suppress warnings about log of zero
|
|
with np.errstate(divide="ignore"):
|
|
summed = np.sum(exp, axis=axis, keepdims=True)
|
|
out = np.log(summed)
|
|
return subtract_maxs - out
|
|
|
|
@staticmethod
|
|
def longest_token_prefix(a: Sequence[int], b: Sequence[int]):
|
|
longest_prefix = 0
|
|
for _a, _b in zip(a, b):
|
|
if _a == _b:
|
|
longest_prefix += 1
|
|
else:
|
|
break
|
|
return longest_prefix
|
|
|
|
|
|
class LlamaTokenizer:
|
|
def __init__(self, llama: Llama):
|
|
self.llama = llama
|
|
|
|
def encode(self, text: str, add_bos: bool = True) -> List[int]:
|
|
return self.llama.tokenize(
|
|
text.encode("utf-8", errors="ignore"), add_bos=add_bos, special=True
|
|
)
|
|
|
|
def decode(self, tokens: List[int]) -> str:
|
|
return self.llama.detokenize(tokens).decode("utf-8", errors="ignore")
|
|
|
|
@classmethod
|
|
def from_ggml_file(cls, path: str) -> "LlamaTokenizer":
|
|
return cls(Llama(model_path=path, vocab_only=True))
|
|
|
|
|
|
class LlamaState:
|
|
def __init__(
|
|
self,
|
|
input_ids: npt.NDArray[np.intc],
|
|
scores: npt.NDArray[np.single],
|
|
n_tokens: int,
|
|
llama_state: bytes,
|
|
llama_state_size: int,
|
|
):
|
|
self.input_ids = input_ids
|
|
self.scores = scores
|
|
self.n_tokens = n_tokens
|
|
self.llama_state = llama_state
|
|
self.llama_state_size = llama_state_size
|
|
|
|
|
|
LogitsProcessor = Callable[
|
|
[npt.NDArray[np.intc], npt.NDArray[np.single]], npt.NDArray[np.single]
|
|
]
|
|
|
|
|
|
class LogitsProcessorList(List[LogitsProcessor]):
|
|
def __call__(
|
|
self, input_ids: npt.NDArray[np.intc], scores: npt.NDArray[np.single]
|
|
) -> npt.NDArray[np.single]:
|
|
for processor in self:
|
|
scores = processor(input_ids, scores)
|
|
return scores
|
|
|
|
|
|
StoppingCriteria = Callable[[npt.NDArray[np.intc], npt.NDArray[np.single]], bool]
|
|
|
|
|
|
class StoppingCriteriaList(List[StoppingCriteria]):
|
|
def __call__(
|
|
self, input_ids: npt.NDArray[np.intc], logits: npt.NDArray[np.single]
|
|
) -> bool:
|
|
return any([stopping_criteria(input_ids, logits) for stopping_criteria in self])
|