目录说明

• source_mnist/ 原始MNIST数据集
• data/ numpy解析后的数据集
• model/ 训练的模型
• test/ 测试图片

解析MNIST数据集

详情参考 mnist数据集说明

1. MNIST共6000张训练图片，1000张测试图片，共有四个二进制文件

• train-images-idx3-ubyte： training set images
• train-labels-idx1-ubyte: training set labels
• t10k-images-idx3-ubyte: test set images
• t10k-labels-idx1-ubyte: test set labels

2. MNIST 文件格式说明

TRAINING SET LABEL FILE (train-labels-idx1-ubyte)

[offset]	[type]	[value]	[description]
0000	32 bit integer	0x00000801(2049)	magic number (MSB first)
0004	32 bit integer	60000	number of items
0008	unsigned byte		??
0009	unsigned byte	??	label
xxxx	unsigned byte	??	label

TRAINING SET IMAGE FILE (train-images-idx3-ubyte)

[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

Pixels are organized row-wise. Pixel values are 0 to 255. 0 means background (white), 255 means foreground (black).

TEST SET LABEL FILE (t10k-labels-idx1-ubyte): [offset] [type] [value] [description] 0000 32 bit integer 0x00000801(2049) magic number (MSB first) 0004 32 bit integer 10000 number of items 0008 unsigned byte ?? label 0009 unsigned byte ?? label ........ xxxx unsigned byte ?? label The labels values are 0 to 9.

TEST SET IMAGE FILE (t10k-images-idx3-ubyte): [offset] [type] [value] [description] 0000 32 bit integer 0x00000803(2051) magic number 0004 32 bit integer 10000 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

3 MNIST 图片格式说明 MNIST是28*28像素的灰度图片(对应PIL类型为L), 实际是一个二维矩阵，0表示无内容，1-255表示有内容，数值表示对应灰度值