Sample subgraph per step or per epoch?

[ultmaster]

Hi.

I've been recently writing ENAS myself, and I notice this project as a great reference for implementing ENAS in Keras.

After reading your code, I have a concern that in your code, a subgraph is sampled per epoch. However, according to ENAS paper, this should be done at each mini-batch. The same is true for validation (training RL controller).

Any comments on that?