Update to more sensible return signature

llama_cpp/llama.py

@@ -2,7 +2,7 @@ import os
 import uuid
 import time
 import multiprocessing
-from typing import List, Optional, Union, Generator, Sequence
+from typing import List, Optional, Union, Generator, Sequence, Iterator
 from collections import deque
 
 from . import llama_cpp
@@ -286,10 +286,7 @@ class Llama:
         repeat_penalty: float = 1.1,
         top_k: int = 40,
         stream: bool = False,
-    ) -> Union[
-        Generator[Completion, None, None],
-        Generator[CompletionChunk, None, None],
-    ]:
+    ) -> Union[Iterator[Completion], Iterator[CompletionChunk],]:
         assert self.ctx is not None
         completion_id = f"cmpl-{str(uuid.uuid4())}"
         created = int(time.time())
@@ -428,7 +425,7 @@ class Llama:
         repeat_penalty: float = 1.1,
         top_k: int = 40,
         stream: bool = False,
-    ) -> Union[Completion, Generator[CompletionChunk, None, None]]:
+    ) -> Union[Completion, Iterator[CompletionChunk]]:
         """Generate text from a prompt.
 
         Args:
@@ -465,7 +462,7 @@ class Llama:
             stream=stream,
         )
         if stream:
-            chunks: Generator[CompletionChunk, None, None] = completion_or_chunks
+            chunks: Iterator[CompletionChunk] = completion_or_chunks
             return chunks
         completion: Completion = next(completion_or_chunks)  # type: ignore
         return completion