【原】Dataset之MNIST：MNIST(手写数字图片识别+csv文件)数据集简介、下载、使用方法之详细攻略

Dataset之MNIST：MNIST(手写数字图片识别+csv文件)数据集简介、下载、使用方法之详细攻略

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MNIST数据集简介

MNIS下手写体数字图片像素表示矩阵

      带有数字类别的train.csv、测试文件test.csv。每个手写体数字图像在这两份文件中都被首尾拼接为一个28*28=784维的像素向量，而且每个像素都使用[0，1]之间的灰度值来显示手写笔画的明暗程度。

参考文章：Dataset之MNIST：MNIST(手写数字图片识别+ubyte.gz文件)数据集简介、下载、使用方法(包括数据集增强)之详细攻略

1、train.csv

2、test.csv

MNIST数据集下载

MNIST(手写数字图片识别+csv文件)数据集下载

MNIST数据集使用方法

案例：DL之LiR&DNN&CNN：利用LiR、DNN、CNN算法对MNIST手写数字图片(csv)识别数据集实现(10)分类预测

The data files train.csv and test.csv contain gray-scale images of hand-drawn digits, from zero through nine.

Each image is 28 pixels in height and 28 pixels in width, for a total of 784 pixels in total. Each pixel has a single pixel-value associated with it, indicating the lightness or darkness of that pixel, with higher numbers meaning darker. This pixel-value is an integer between 0 and 255, inclusive.

The training data set, (train.csv), has 785 columns. The first column, called "label", is the digit that was drawn by the user. The rest of the columns contain the pixel-values of the associated image.

Each pixel column in the training set has a name like pixelx, where x is an integer between 0 and 783, inclusive. To locate this pixel on the image, suppose that we have decomposed x as x = i * 28 + j, where i and j are integers between 0 and 27, inclusive. Then pixelx is located on row i and column j of a 28 x 28 matrix, (indexing by zero).

For example, pixel31 indicates the pixel that is in the fourth column from the left, and the second row from the top, as in the ascii-diagram below.

Visually, if we omit the "pixel" prefix, the pixels make up the image like this:

000 001 002 003 ... 026 027
028 029 030 031 ... 054 055
056 057 058 059 ... 082 083
 |   |   |   |  ...  |   |
728 729 730 731 ... 754 755
756 757 758 759 ... 782 783 

The test data set, (test.csv), is the same as the training set, except that it does not contain the "label" column.

Your submission file should be in the following format: For each of the 28000 images in the test set, output a single line containing the ImageId and the digit you predict. For example, if you predict that the first image is of a 3, the second image is of a 7, and the third image is of a 8, then your submission file would look like:

ImageId,Label
1,3
2,7
3,8 
(27997 more lines)

The evaluation metric for this contest is the categorization accuracy, or the proportion of test images that are correctly classified. For example, a categorization accuracy of 0.97 indicates that you have correctly classified all but 3% of the images.