"Number of training examples" variable does not exist.

Hello,
I have a question about a variable called

> --num_of_train_examples=<NUM_OF_TRAIN_EXAMPLES> \ 

it is mentioned in the .md file, and it seems important for reproduction of the results shown in the paper. However it does not exist in the code at all. It is not in the args.py. 
Could you please tell me if that variable called differently in the code?


Thank you. 