367 lines
8.5 KiB
Go
367 lines
8.5 KiB
Go
package llm
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"strings"
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)
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type GGML struct {
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container
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model
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}
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type model interface {
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KV() KV
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Tensors() Tensors
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}
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type KV map[string]any
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func (kv KV) u64(key string) uint64 {
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switch v := kv[key].(type) {
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case uint64:
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return v
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case uint32:
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return uint64(v)
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case float64:
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return uint64(v)
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default:
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return 0
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}
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}
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func (kv KV) Architecture() string {
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if s, ok := kv["general.architecture"].(string); ok {
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return s
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}
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return "unknown"
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}
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func (kv KV) ParameterCount() uint64 {
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return kv.u64("general.parameter_count")
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}
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func (kv KV) FileType() fileType {
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if u64 := kv.u64("general.file_type"); u64 > 0 {
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return fileType(uint32(u64))
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}
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return fileTypeUnknown
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}
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func (kv KV) BlockCount() uint64 {
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return kv.u64(fmt.Sprintf("%s.block_count", kv.Architecture()))
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}
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func (kv KV) HeadCount() uint64 {
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return kv.u64(fmt.Sprintf("%s.attention.head_count", kv.Architecture()))
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}
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func (kv KV) HeadCountKV() uint64 {
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if headCountKV := kv.u64(fmt.Sprintf("%s.attention.head_count_kv", kv.Architecture())); headCountKV > 0 {
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return headCountKV
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}
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return 1
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}
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func (kv KV) GQA() uint64 {
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return kv.HeadCount() / kv.HeadCountKV()
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}
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func (kv KV) EmbeddingLength() uint64 {
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return kv.u64(fmt.Sprintf("%s.embedding_length", kv.Architecture()))
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}
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func (kv KV) ContextLength() uint64 {
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return kv.u64(fmt.Sprintf("%s.context_length", kv.Architecture()))
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}
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type Tensors []*Tensor
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func (ts Tensors) Layers() map[string]Layer {
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layers := make(map[string]Layer)
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for _, t := range ts {
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parts := strings.Split(t.Name, ".")
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if parts[0] == "blk" {
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// join first and second part, e.g. blk.%d
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parts = append([]string{fmt.Sprintf("%s.%s", parts[0], parts[1])}, parts[2:]...)
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}
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if _, ok := layers[parts[0]]; !ok {
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layers[parts[0]] = make(Layer)
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}
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layers[parts[0]][strings.Join(parts[1:], ".")] = t
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}
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return layers
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}
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type Layer map[string]*Tensor
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func (l Layer) size() (size uint64) {
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for _, t := range l {
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size += t.Size()
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}
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return size
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}
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type Tensor struct {
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Name string `json:"name"`
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Kind uint32 `json:"kind"`
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Offset uint64 `json:"-"`
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// Shape is the number of elements in each dimension
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Shape []uint64 `json:"shape"`
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io.WriterTo `json:"-"`
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}
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func (t Tensor) blockSize() uint64 {
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switch t.Kind {
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case 0, 1, 24, 25, 26, 27, 28, 31: // F32, F16, I8, I16, I32, I64, F64, BF16
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return 1
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case 2, 3, 8, 9, 20: // Q4_0, Q4_1, Q8_0, Q8_1, IQ4_NL
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return 32
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default: // All others
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return 256
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}
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}
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func (t Tensor) typeSize() uint64 {
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blockSize := t.blockSize()
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switch t.Kind {
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case 0: // FP32
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return 4
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case 1: // FP16
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return 2
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case 2: // Q4_0
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return 2 + blockSize/2
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case 3: // Q4_1
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return 2 + 2 + blockSize/2
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case 6: // Q5_0
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return 2 + 4 + blockSize/2
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case 7: // Q5_1
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return 2 + 2 + 4 + blockSize/2
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case 8: // Q8_0
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return 2 + blockSize
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case 9: // Q8_1
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return 4 + 4 + blockSize
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case 10: // Q2_K
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return blockSize/16 + blockSize/4 + 2 + 2
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case 11: // Q3_K
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return blockSize/8 + blockSize/4 + 12 + 2
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case 12: // Q4_K
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return 2 + 2 + 12 + blockSize/2
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case 13: // Q5_K
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return 2 + 2 + 12 + blockSize/8 + blockSize/2
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case 14: // Q6_K
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return blockSize/2 + blockSize/4 + blockSize/16 + 2
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case 15: // Q8_K
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return 2 + blockSize + 2*blockSize/16
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case 16: // IQ2_XXS
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return 2 + 2*blockSize/8
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case 17: // IQ2_XS
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return 2 + 2*blockSize/8 + blockSize/32
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case 18: // IQ3_XXS
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return 2 + blockSize/4 + blockSize/8
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case 19: // IQ1_S
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return 2 + blockSize/8 + blockSize/16
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case 20: // IQ4_NL
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return 2 + blockSize/2
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case 21: // IQ3_S
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return 2 + blockSize/4 + blockSize/8 + blockSize/32 + 4
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case 22: // IQ2_S
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return 2 + blockSize/4 + blockSize/16
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case 23: // IQ4_XS
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return 2 + 2 + blockSize/2 + blockSize/64
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case 24: // I8
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return 1
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case 25: // I16
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return 2
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case 26: // I32
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return 4
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case 27: // I64
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return 8
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case 28: // F64
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return 8
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case 29: // IQ1_M
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return blockSize/8 + blockSize/16 + blockSize/32
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default:
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return 0
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}
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}
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func (t Tensor) parameters() uint64 {
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var count uint64 = 1
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for _, n := range t.Shape {
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count *= n
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}
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return count
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}
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func (t Tensor) Size() uint64 {
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return t.parameters() * t.typeSize() / t.blockSize()
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}
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type container interface {
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Name() string
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Decode(io.ReadSeeker) (model, error)
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}
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const (
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// Magic constant for `ggml` files (unversioned).
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FILE_MAGIC_GGML = 0x67676d6c
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// Magic constant for `ggml` files (versioned, ggmf).
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FILE_MAGIC_GGMF = 0x67676d66
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// Magic constant for `ggml` files (versioned, ggjt).
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FILE_MAGIC_GGJT = 0x67676a74
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// Magic constant for `ggla` files (LoRA adapter).
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FILE_MAGIC_GGLA = 0x67676C61
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// Magic constant for `gguf` files (versioned, gguf)
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FILE_MAGIC_GGUF_LE = 0x46554747
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FILE_MAGIC_GGUF_BE = 0x47475546
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)
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var ErrUnsupportedFormat = errors.New("unsupported model format")
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func DetectGGMLType(b []byte) string {
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switch binary.LittleEndian.Uint32(b[:4]) {
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case FILE_MAGIC_GGML:
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return "ggml"
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case FILE_MAGIC_GGMF:
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return "ggmf"
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case FILE_MAGIC_GGJT:
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return "ggjt"
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case FILE_MAGIC_GGLA:
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return "ggla"
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case FILE_MAGIC_GGUF_LE, FILE_MAGIC_GGUF_BE:
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return "gguf"
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default:
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return ""
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}
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}
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func DecodeGGML(rs io.ReadSeeker) (*GGML, int64, error) {
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var magic uint32
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if err := binary.Read(rs, binary.LittleEndian, &magic); err != nil {
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return nil, 0, err
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}
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var c container
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switch magic {
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case FILE_MAGIC_GGML, FILE_MAGIC_GGMF, FILE_MAGIC_GGJT:
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return nil, 0, ErrUnsupportedFormat
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case FILE_MAGIC_GGLA:
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c = &containerGGLA{}
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case FILE_MAGIC_GGUF_LE:
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c = &containerGGUF{ByteOrder: binary.LittleEndian}
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case FILE_MAGIC_GGUF_BE:
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c = &containerGGUF{ByteOrder: binary.BigEndian}
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default:
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return nil, 0, errors.New("invalid file magic")
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}
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model, err := c.Decode(rs)
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if errors.Is(err, io.EOF) {
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// noop
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} else if err != nil {
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return nil, 0, err
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}
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offset, err := rs.Seek(0, io.SeekCurrent)
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if err != nil {
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return nil, 0, err
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}
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// final model type
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return &GGML{
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container: c,
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model: model,
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}, offset, nil
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}
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func (llm GGML) GraphSize(context, batch uint64) (partialOffload, fullOffload uint64) {
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embedding := llm.KV().EmbeddingLength()
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heads := llm.KV().HeadCount()
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headsKV := llm.KV().HeadCountKV()
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vocab := uint64(len(llm.KV()["tokenizer.ggml.tokens"].([]any)))
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layers := llm.Tensors().Layers()
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switch llm.KV().Architecture() {
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case "llama":
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fullOffload = 4 * batch * (1 + 4*embedding + context*(1+heads))
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partialOffload = 4 * batch * embedding
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partialOffload += max(
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4*batch*(1+embedding+max(context, embedding))+embedding*embedding*9/16+4*context*(batch*heads+embedding/heads*headsKV),
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4*batch*(embedding+vocab)+embedding*vocab*105/128,
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)
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if ffnGateExpsWeight, ok := layers["blk.0"]["ffn_gate_exps.weight"]; ok {
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// mixtral 8x22b
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ff := uint64(llm.KV()["llama.feed_forward_length"].(uint32))
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partialOffload = max(
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3*ffnGateExpsWeight.Size()+4*batch*(2*ff+headsKV+embedding+context+embedding/heads*headsKV),
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4*(context*batch*heads+context*embedding/heads*headsKV+batch*1024+embedding/heads*headsKV*batch),
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)
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} else if ffnGateWeight, ok := layers["blk.0"]["ffn_gate.0.weight"]; ok {
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// mixtral 8x7b
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ffnGateWeight1 := ffnGateWeight.Shape[1]
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fullOffload = 4 * batch * (2 + 3*embedding + context*(1+heads) + 2*headsKV + ffnGateWeight1)
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partialOffload = max(
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4*batch*(3+embedding/heads*headsKV+embedding+context*(1+heads)+ffnGateWeight1)+(embedding*embedding+3*embedding*headsKV*ffnGateWeight1)*9/16,
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4*batch*(1+2*embedding+context*(1+heads))+embedding*(6*context*headsKV/heads+embedding*9/16),
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)
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}
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case "gemma":
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fullOffload = 4 * batch * (embedding + vocab)
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partialOffload = 4*batch*(2*embedding+vocab+1) + embedding*vocab*105/128
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case "command-r":
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fullOffload = max(
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4*batch*(embedding+vocab),
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4*batch*(2+4*embedding+context*(1+heads)),
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)
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partialOffload = max(
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4*batch*(embedding+vocab)+embedding*vocab*105/128,
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4*batch*(1+2*embedding+context*(1+heads))+4*embedding*context+embedding*embedding*9/16,
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)
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case "qwen2":
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fullOffload = max(
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4*batch*(embedding+vocab),
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4*batch*(1+2*embedding+context+context*heads),
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)
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partialOffload = max(
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4*batch*(embedding+vocab)+embedding*vocab*105/128,
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4*(batch*(1+2*embedding+context*(1+heads))+embedding*(1+context)),
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)
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case "phi2":
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fullOffload = max(
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4*batch*(embedding+vocab),
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4*batch*(1+4*embedding+context+context*heads),
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)
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partialOffload = max(
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4*batch*(2*embedding+vocab)+embedding*vocab*105/128,
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4*batch*(2+3*embedding+context+context*heads),
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)
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case "stablelm":
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fullOffload = 4 * batch * (context*(1+heads) + 3*embedding + 2)
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partialOffload = max(
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4*batch*(vocab+2*embedding),
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fullOffload,
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)
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}
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return
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}
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