The `--n_epochs` argument is in fact an iteration, which updates the weight based on a random sample of data points. There is no conclusive definition, but the community generally define epoch to be an entire pass of the whole dataset. See [this](https://deeplearning4j.org/glossary#epoch-vs-iteration) and [this](https://www.quora.com/What-is-an-epoch-in-deep-learning)
