How to use created dataset in others neural networks???

[ArtemGuy]

Hello! I found out that the MNIST dataset is loaded with one .NPZ file while training NN!
But output of this code is very strange! Why it 4 output file? How can i load my own dataset it to NN??
Where is here x_train, y_train/ x_test, y_test?
I understand that largest files is train files, small - test. But it named very strange (for example: ---idx3, ---idx1 ). I was confused.
Hope for your advices and help.
P.S. For example - how can i use it in that code https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/tutorials/mnist/mnist_softmax.py

[Lighthouse-Yang]

You can use the TensorFlow tool to read your data.it's so easy