How about adding a combined step and epoch feature to save_strategy?

[jp1924]

Feature request

Add epoch+steps functionality to save_strategy

Motivation

I often set save_strategy to epoch for saving, but sometimes I need to run experiments with steps.
Recently, I had to compare checkpoints saved at both epoch and step intervals, which required running the experiment twice and was quite cumbersome. Having a combined feature would be really helpful. What do you think?

Your contribution

I can add the epoch+steps functionality to save_strategy.