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paramserializer.go
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/
paramserializer.go
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// Copyright 2019 spaGO Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package nn
import (
"bytes"
"encoding/binary"
"errors"
mat "github.com/nlpodyssey/spago/pkg/mat32"
"github.com/nlpodyssey/spago/pkg/utils"
"io"
)
// ParamSerializer allows serialization and deserialization of a single Param.
type ParamSerializer struct {
*param
}
// NewParamSerializer returns a new ParamSerializer.
// It returns an error if the Param doesn't support serialization.
func NewParamSerializer(p Param) (*ParamSerializer, error) {
switch p := p.(type) {
case *param:
return &ParamSerializer{param: p}, nil
default:
return nil, errors.New("nn: param type not supported for serialization")
}
}
// Serialize dumps the Param to the writer.
func (s *ParamSerializer) Serialize(w io.Writer) (int, error) {
return paramDataMarshalBinaryTo(¶mData{
Value: s.value.(*mat.Dense),
Payload: s.payload,
}, w)
}
// Deserialize assigns reads a Param the reader.
func (s *ParamSerializer) Deserialize(r io.Reader) (n int, err error) {
var data *paramData
data, n, err = paramDataUnmarshalBinaryFrom(r)
if err != nil {
return
}
s.value = data.Value
s.payload = data.Payload
return
}
type paramData struct {
Value *mat.Dense
Payload *Payload
}
func paramDataMarshalBinaryTo(data *paramData, w io.Writer) (int, error) {
n, err := mat.MarshalBinaryTo(data.Value, w)
if err != nil {
return n, err
}
n2, err := PayloadMarshalBinaryTo(data.Payload, w)
n += n2
if err != nil {
return n, err
}
return n, err
}
func paramDataUnmarshalBinaryFrom(r io.Reader) (*paramData, int, error) {
value, n, err := mat.NewUnmarshalBinaryFrom(r)
if err != nil {
return nil, n, err
}
supp, n2, err := NewPayloadUnmarshalBinaryFrom(r)
n += n2
if err != nil {
return nil, n, err
}
return ¶mData{Value: value, Payload: supp}, n, err
}
// PayloadMarshalBinaryTo returns the number of bytes written into w and an error, if any.
func PayloadMarshalBinaryTo(supp *Payload, w io.Writer) (int, error) {
h := header{Label: int64(supp.Label), Size: int64(len(supp.Data))}
n, err := h.marshalBinaryTo(w)
if err != nil {
return n, err
}
nn, err := mat.MarshalBinarySlice(supp.Data, w)
n += nn
return n, err
}
// NewPayloadUnmarshalBinaryFrom reads a Payload from the given reader.
func NewPayloadUnmarshalBinaryFrom(r io.Reader) (*Payload, int, error) {
var h header
n, err := h.unmarshalBinaryFrom(r)
if err != nil {
return nil, n, err
}
data := make([]mat.Matrix, h.Size)
nn, err := mat.NewUnmarshalBinarySlice(data, r)
n = +nn
if err != nil {
return nil, n, err
}
supp := &Payload{
Label: int(h.Label),
Data: data,
}
return supp, n, err
}
type header struct {
Label int64
Size int64
}
var headerSize = binary.Size(header{})
func (s header) marshalBinaryTo(w io.Writer) (int, error) {
buf := bytes.NewBuffer(make([]byte, 0, headerSize))
err := binary.Write(buf, binary.LittleEndian, s)
if err != nil {
return 0, err
}
return w.Write(buf.Bytes())
}
func (s *header) unmarshalBinary(buf []byte) error {
err := binary.Read(bytes.NewReader(buf), binary.LittleEndian, s)
if err != nil {
return err
}
return nil
}
func (s *header) unmarshalBinaryFrom(r io.Reader) (int, error) {
buf := make([]byte, headerSize)
n, err := utils.ReadFull(r, buf)
if err != nil {
return n, err
}
return n, s.unmarshalBinary(buf[:n])
}