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feature.go
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feature.go
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package tfutils
import (
"fmt"
"reflect"
tf "github.com/desertbit/tfutils/tensorflow/core/example"
"github.com/golang/protobuf/proto"
)
// GetFeatureFromGoType returns a tensorflow Feature instance for the
// underlying golang type. Note that not all primitive types are massaged
// into one of the feature types here (yet).
func GetFeatureFromGoType(x interface{}) (*tf.Feature, error) {
tstr := reflect.TypeOf(x).String()
switch tstr {
case "int":
return &tf.Feature{Kind: &tf.Feature_Int64List{Int64List: &tf.Int64List{Value: []int64{int64(x.(int))}}}}, nil
case "string":
return &tf.Feature{Kind: &tf.Feature_BytesList{BytesList: &tf.BytesList{Value: [][]byte{[]byte(x.(string))}}}}, nil
case "[]string":
ss := x.([]string)
bs := make([][]byte, len(ss))
for i, s := range ss {
bs[i] = []byte(s)
}
return &tf.Feature{Kind: &tf.Feature_BytesList{BytesList: &tf.BytesList{Value: bs}}}, nil
case "[]uint8":
return &tf.Feature{Kind: &tf.Feature_BytesList{BytesList: &tf.BytesList{Value: [][]byte{[]byte(x.([]uint8))}}}}, nil
case "[]int64":
return &tf.Feature{Kind: &tf.Feature_Int64List{Int64List: &tf.Int64List{Value: x.([]int64)}}}, nil
case "[][]uint8":
return &tf.Feature{Kind: &tf.Feature_BytesList{BytesList: &tf.BytesList{Value: x.([][]byte)}}}, nil
case "[]float32":
return &tf.Feature{Kind: &tf.Feature_FloatList{FloatList: &tf.FloatList{Value: x.([]float32)}}}, nil
}
return nil, fmt.Errorf("unknown base type %s", tstr)
}
// GetFeaturesFromMap returns a tensorflow Features instance based on
// the generic map of string->value being passed in.
func GetFeaturesFromMap(m map[string]interface{}) (*tf.Features, error) {
fs := map[string]*tf.Feature{}
for k, v := range m {
f, err := GetFeatureFromGoType(v)
if err != nil {
return nil, err
}
fs[k] = f
}
return &tf.Features{Feature: fs}, nil
}
// GetTFRecordStringForFeatures returns a serialized version of an "Example"
// protobuffer for writing using a TF RecordWriter.
func GetTFRecordStringForFeatures(fs *tf.Features) ([]byte, error) {
ex := &tf.Example{
Features: fs,
}
return proto.Marshal(ex)
}
func GetFeatureMapFromTFRecord(data []byte) (*tf.Features, error) {
ex := tf.Example{}
if err := proto.Unmarshal(data, &ex); err != nil {
return nil, err
}
return ex.Features, nil
}