Python reads binary mnist

Training data data structure:

[Offset] [Type]          [Value]          [description] 0000     -bit integer  0x00000803 (2051) magic number 0004-     bit integer  60000            number of Images 0008-     bit integer number of               rows 0012 a     bit integer number  of               columns 0016
   unsigned byte   ??               Pixel 0017     unsigned byte   ??               Pixel ... xxxx     unsigned byte   ??               Pixel

To read the entire file in:

filename = ' train-images.idx3-ubyte ' binfile = open (filename, ' rb ') BUF = Binfile.read ()

Read the first four 32bit Interger:

index = 0magic, Numimages, numrows, NumColumns = Struct.unpack_from (' >iiii ', buf, index) Index + = struct.calcsize (' & GT;IIII ')

Read a picture, 784=28*28:

im = Struct.unpack_from (' >784b ', buf, index) Index + = struct.calcsize (' >784b ') im = Np.array (im) im = Im.reshape ( 28,28) FIG = plt.figure () Plotwindow = Fig.add_subplot (111) Plt.imshow (IM, cmap= ' gray ') plt.show ()

Python reads binary mnist