/
io.go
89 lines (82 loc) · 1.64 KB
/
io.go
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package mnist
import (
"encoding/binary"
"io"
"os"
)
const numLabels = 10
const pixelRange = 255
const (
imageMagic = 0x00000803
labelMagic = 0x00000801
// Width of the input tensor / picture
Width = 28
// Height of the input tensor / picture
Height = 28
)
func readLabelFile(r io.Reader, e error) (labels []Label, err error) {
if e != nil {
return nil, e
}
var (
magic int32
n int32
)
if err = binary.Read(r, binary.BigEndian, &magic); err != nil {
return nil, err
}
if magic != labelMagic {
return nil, os.ErrInvalid
}
if err = binary.Read(r, binary.BigEndian, &n); err != nil {
return nil, err
}
labels = make([]Label, n)
for i := 0; i < int(n); i++ {
var l Label
if err := binary.Read(r, binary.BigEndian, &l); err != nil {
return nil, err
}
labels[i] = l
}
return labels, nil
}
func readImageFile(r io.Reader, e error) (imgs []RawImage, err error) {
if e != nil {
return nil, e
}
var (
magic int32
n int32
nrow int32
ncol int32
)
if err = binary.Read(r, binary.BigEndian, &magic); err != nil {
return nil, err
}
if magic != imageMagic {
return nil, err /*os.ErrInvalid*/
}
if err = binary.Read(r, binary.BigEndian, &n); err != nil {
return nil, err
}
if err = binary.Read(r, binary.BigEndian, &nrow); err != nil {
return nil, err
}
if err = binary.Read(r, binary.BigEndian, &ncol); err != nil {
return nil, err
}
imgs = make([]RawImage, n)
m := int(nrow * ncol)
for i := 0; i < int(n); i++ {
imgs[i] = make(RawImage, m)
m_, err := io.ReadFull(r, imgs[i])
if err != nil {
return nil, err
}
if m_ != int(m) {
return nil, os.ErrInvalid
}
}
return imgs, nil
}