epoch!

			epoch!(learner, phase[, dataiter])

Train learner for one epoch on dataiter. Iterates through dataiter and step!s for each batch/item.

If no data iterator is passed in, use learner.data[phasedataiter(phase)].

Extending

The default implementation iterates over every batch in dataiter and calls step! for each. This behavior can be overloaded by implementing epoch!(learner, ::MyPhase, dataiter).

If you're implementing a custom epoch! method, it is recommended you make use of runepoch to get begin and end events as well as proper handling of CancelEpochExceptions.

See the default implementation for reference.