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|
package onnx
//go:generate bash scripts/gen.sh
import (
"encoding/binary"
"math"
"os"
"path/filepath"
"strconv"
"google.golang.org/protobuf/proto"
"go.jknobloc.com/x/onnx/internal/pb"
)
func ExtractInitializer(name string, initializer string) ([]float32, []int, error) {
var data []byte
if d, err := os.ReadFile(name); err != nil {
return nil, nil, err
} else {
data = d
}
model := &pb.ModelProto{}
if err := proto.Unmarshal(data, model); err != nil {
return nil, nil, err
}
g := model.GetGraph()
var result []float32
var shape []int64
ok := false
for _, init := range g.GetInitializer() {
if init.GetName() == initializer {
var raw []byte
if init.GetDataLocation() == pb.TensorProto_EXTERNAL {
raw = readExternalData(name, init.GetExternalData())
} else {
raw = init.GetRawData()
}
result = make([]float32, len(raw)/4)
for i := 0; i < len(result); i++ {
bits := binary.LittleEndian.Uint32(raw[i*4 : (i+1)*4])
result[i] = math.Float32frombits(bits)
}
shape = init.GetDims()
ok = true
break
}
}
if !ok {
panic("initializer not found")
}
shapeInt := make([]int, len(shape))
for i, v := range shape {
shapeInt[i] = int(v)
}
return result, shapeInt, nil
}
func readExternalData(name string, entries []*pb.StringStringEntryProto) []byte {
var location string
var offset, length int64
for _, e := range entries {
switch e.GetKey() {
case "location":
location = e.GetValue()
case "offset":
offset, _ = strconv.ParseInt(e.GetValue(), 10, 64)
case "length":
length, _ = strconv.ParseInt(e.GetValue(), 10, 64)
}
}
data := filepath.Join(filepath.Dir(name), location)
var file *os.File
if f, err := os.Open(data); err != nil {
panic(err)
} else {
file = f
}
defer file.Close()
if offset > 0 {
if _, err := file.Seek(offset, 0); err != nil {
panic(err)
}
}
var buf []byte
if length > 0 {
buf = make([]byte, length)
if _, err := file.Read(buf); err != nil {
panic(err)
}
} else {
var err error
buf, err = os.ReadFile(data)
if err != nil {
panic(err)
}
if offset > 0 {
buf = buf[offset:]
}
}
return buf
}
|
