mnist数字显示 python实现

# -*- coding: utf-8 -*-"""Created on Mon Dec  5 10:21:53 2016@author: haoming"""# -*- coding:utf-8  import numpy as np   import struct  import matplotlib.pyplot as plt     filename = 'train-images.idx3-ubyte'  #filename = 'C:/Users/haoming/Desktop/train-images-idx3-ubyte' binfile = open(filename,'rb')#以二进制方式打开  buf = binfile.read()    index = 0  magic, numImages, numRows, numColums = struct.unpack_from('>IIII',buf,index)#读取4个32 int  print (magic,' ',numImages,' ',numRows,' ',numColums  )index += struct.calcsize('>IIII')      im = struct.unpack_from('>784B',buf,index)#每张图是28*28=784Byte,这里只显示第一张图  index += struct.calcsize('>784B' )    im = np.array(im)  im = im.reshape(28,28)  print( im )   fig = plt.figure()  plt.imshow(im,cmap = 'binary')#黑白显示  plt.show()  

显示出来的字