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checkpoint_mmap.go
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checkpoint_mmap.go
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package llama2
import (
"encoding/binary"
"fmt"
"io"
"os"
"syscall"
"unsafe"
)
type MmapCheckpoint struct {
f *os.File
data []byte
dim int
hiddenDim int
nLayers int
nHeads int
nKvHeads int
vocabSize int
seqLen int
tokenEmbeddingTable []float32
rmsAttWeight []float32
wq []float32
wk []float32
wv []float32
wo []float32
rmsFfnWeight []float32
w1 []float32
w2 []float32
w3 []float32
rmsFinalWeight []float32
freqCisReal []float32
freqCisImag []float32
wcls []float32
sharedWeights bool
}
func NewMmapCheckpoint(pathname string) (*MmapCheckpoint, error) {
f, err := os.Open(pathname)
if err != nil {
return nil, fmt.Errorf("loading checkpoint file: %w", err)
}
defer func() {
if err != nil {
f.Close()
}
}()
var config struct {
Dim int32
HiddenDim int32
NLayers int32
NHeads int32
NKvHeads int32
VocabSize int32
SeqLen int32
}
if err := binary.Read(f, binary.LittleEndian, &config); err != nil {
return nil, fmt.Errorf("reading config: %w", err)
}
checkpoint := &MmapCheckpoint{
dim: int(config.Dim),
hiddenDim: int(config.HiddenDim),
nLayers: int(config.NLayers),
nHeads: int(config.NHeads),
nKvHeads: int(config.NKvHeads),
vocabSize: int(config.VocabSize),
seqLen: int(config.SeqLen),
}
checkpoint.sharedWeights = checkpoint.vocabSize > 0
if !checkpoint.sharedWeights {
checkpoint.vocabSize = -checkpoint.vocabSize
}
offset, err := f.Seek(0, io.SeekCurrent)
if err != nil {
return nil, fmt.Errorf("finding weight offset: %w", err)
}
size, err := f.Seek(0, io.SeekEnd)
if err != nil {
return nil, fmt.Errorf("finding file size: %w", err)
}
data, err := syscall.Mmap(int(f.Fd()), 0, int(size), syscall.PROT_READ, syscall.MAP_PRIVATE)
if err != nil {
return nil, fmt.Errorf("mmap: %w", err)
}
floats := unsafe.Slice((*float32)(unsafe.Pointer(&data[offset])), len(data)-int(offset)/4)
off := 0
assign := func(size int) []float32 {
field := floats[off : off+int(size)]
off += int(size)
return field
}
checkpoint.tokenEmbeddingTable = assign(checkpoint.vocabSize * checkpoint.dim)
checkpoint.rmsAttWeight = assign(checkpoint.nLayers * checkpoint.dim)
checkpoint.wq = assign(checkpoint.nLayers * checkpoint.dim * checkpoint.dim)
checkpoint.wk = assign(checkpoint.nLayers * checkpoint.dim * checkpoint.dim)
checkpoint.wv = assign(checkpoint.nLayers * checkpoint.dim * checkpoint.dim)
checkpoint.wo = assign(checkpoint.nLayers * checkpoint.dim * checkpoint.dim)
checkpoint.rmsFfnWeight = assign(checkpoint.nLayers * checkpoint.dim)
checkpoint.w1 = assign(checkpoint.nLayers * checkpoint.hiddenDim * checkpoint.dim)
checkpoint.w2 = assign(checkpoint.nLayers * checkpoint.dim * checkpoint.hiddenDim)
checkpoint.w3 = assign(checkpoint.nLayers * checkpoint.hiddenDim * checkpoint.dim)
checkpoint.rmsFinalWeight = assign(checkpoint.dim)
checkpoint.freqCisReal = assign(checkpoint.seqLen * checkpoint.dim / checkpoint.nHeads / 2)
checkpoint.freqCisImag = assign(checkpoint.seqLen * checkpoint.dim / checkpoint.nHeads / 2)
if !checkpoint.sharedWeights {
checkpoint.wcls = assign(checkpoint.vocabSize * checkpoint.dim)
} else {
checkpoint.wcls = checkpoint.tokenEmbeddingTable
}
checkpoint.f = f
checkpoint.data = data
return checkpoint, err
}
func (c *MmapCheckpoint) Error() error {
return nil
}
func (c *MmapCheckpoint) Close() error {
defer c.f.Close()
if err := syscall.Munmap(c.data); err != nil {
return err
}
return c.f.Close()
}
func (c *MmapCheckpoint) Dim() int {
return c.dim
}
func (c *MmapCheckpoint) HiddenDim() int {
return c.hiddenDim
}
func (c *MmapCheckpoint) NLayers() int {
return c.nLayers
}
func (c *MmapCheckpoint) NHeads() int {
return c.nHeads
}
func (c *MmapCheckpoint) NKvHeads() int {
return c.nKvHeads
}
func (c *MmapCheckpoint) VocabSize() int {
return c.vocabSize
}
func (c *MmapCheckpoint) SeqLen() int {
return c.seqLen
}
func (c *MmapCheckpoint) TokenEmbeddingTable(token int) []float32 {
return c.tokenEmbeddingTable[token*c.dim : (token+1)*c.dim]
}
func (c *MmapCheckpoint) RmsAttWeight(layer int) []float32 {
return c.rmsAttWeight[layer*c.dim : (layer+1)*c.dim]
}
func (c *MmapCheckpoint) RmsFfnWeight(layer int) []float32 {
return c.rmsFfnWeight[layer*c.dim : (layer+1)*c.dim]
}
func (c *MmapCheckpoint) Wq(layer int) []float32 {
return c.wq[layer*c.dim*c.dim : (layer+1)*c.dim*c.dim]
}
func (c *MmapCheckpoint) Wk(layer int) []float32 {
return c.wk[layer*c.dim*c.dim : (layer+1)*c.dim*c.dim]
}
func (c *MmapCheckpoint) Wv(layer int) []float32 {
return c.wv[layer*c.dim*c.dim : (layer+1)*c.dim*c.dim]
}
func (c *MmapCheckpoint) Wo(layer int) []float32 {
return c.wo[layer*c.dim*c.dim : (layer+1)*c.dim*c.dim]
}
func (c *MmapCheckpoint) W1(layer int) []float32 {
return c.w1[layer*c.dim*c.hiddenDim : (layer+1)*c.dim*c.hiddenDim]
}
func (c *MmapCheckpoint) W2(layer int) []float32 {
return c.w2[layer*c.dim*c.hiddenDim : (layer+1)*c.dim*c.hiddenDim]
}
func (c *MmapCheckpoint) W3(layer int) []float32 {
return c.w3[layer*c.dim*c.hiddenDim : (layer+1)*c.dim*c.hiddenDim]
}
func (c *MmapCheckpoint) RmsFinalWeight() []float32 {
return c.rmsFinalWeight
}
func (c *MmapCheckpoint) FreqCisReal(pos int) []float32 {
return c.freqCisReal[pos*c.dim/c.nHeads/2 : (pos+1)*c.dim/c.nHeads/2]
}
func (c *MmapCheckpoint) FreqCisImag(pos int) []float32 {
return c.freqCisImag[pos*c.dim/c.nHeads/2 : (pos+1)*c.dim/c.nHeads/2]
}
func (c *MmapCheckpoint) Wcls() []float32 {
return c.wcls
}