This page shows up underneath the data files. Here you describe what files you have provided and the format of each. There is no single format for this page that is appropriate for all competitons, but you should strive to describe as much as you can here. A little time spent describing the data here can save a lot of time answering questions later.
Participants should be able to answer questions like these after reading the data description: What files do I need? What should I expect the data format to be? What am I predicting? What acroynms will I encounter?
File descriptions
mnist_train.csv
- the training set
mnist_test.csv
- the test set
sampleSubmission.csv
- a sample submission file in the correct format
Train File
The train file consist of first column as the Labels of the digit. The 28x28 image of digits has been flattened into an array of 1x784 and appended next to the label, making the first entry of 1x785. 
The test only consists of flattened pixels and no labels. So the dimension of row will be 1x784 corresponding to 28x28 pixels of some digit.