Hi,
I have a few very very simple questions. Just started learning how to use TensorFlow, am going through the first beginner tutorial. Can someone explain to me what these two numbers represent:

Number11104×463 65 KB


Number2893×477 52.1 KB

According to the tutorial, there are 70k of images. Are all 60k images used for updating the weights and biases in the neural network at every iteration or is it only 1875? Similarly, are the remaining 10k used for testing or is it 313?
Thanks.