The data is the same data as in the previous chapter: the MNIST dataset. It can be found in the repository for this chapter, and we'll be using a function we wrote in the previous chapter to acquire the data:
// Image holds the pixel intensities of an image.// 255 is foreground (black), 0 is background (white).type RawImage []byte// Label is a digit label in 0 to 9type Label uint8const numLabels = 10const pixelRange = 255const ( imageMagic = 0x00000803 labelMagic = 0x00000801 Width = 28 Height = 28)func readLabelFile(r io.Reader, e error) (labels []Label, err error) { if e != nil { return nil, e } var magic, n int32 if err = binary.Read(r, binary.BigEndian, &magic); err != nil { return nil, err } if magic != labelMagic { ...
