training data 数据结构:
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<br>[offset] [type] [value] [description] 0000 32 bit integer 0x00000803( 2051 ) magic number 0004 32 bit integer 60000 number of images 0008 32 bit integer 28 number of rows 0012 32 bit integer 28 number of columns 0016 unsigned byte ?? pixel 0017 unsigned byte ?? pixel ........ xxxx unsigned byte ?? pixel |
将整个文件读入:
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filename = 'train-images.idx3-ubyte' binfile = open (filename , 'rb' ) buf = binfile.read() |
读取头四个32bit的interger:
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index = 0 magic, numImages , numRows , numColumns = struct.unpack_from( '>IIII' , buf , index) index += struct.calcsize( '>IIII' ) |
读取一个图片,784=28*28 :
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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() |
感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!
原文链接:http://www.cnblogs.com/hit-wangjun/p/6923415.html