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Description
🚀 Feature Request
Add a --validate-after-epochs training flag that is a companion flag to --validate-after-updates.
Note: I already have a PR for this ready that I can contribute if this gets approved.
Motivation
When your task is configured to run validation after each epoch, --validate-after-updates can be difficult to use, since you might not know how many updates are in an epoch. This would add a companion flag that allows you to delay validation until N epochs have passed, without having to know in advance how many batches are included in a single epoch.
There is already precedent to have parallel flags for epoch-based and update-based validation (e.g., --validate-interval vs --validate-interval-updates), so it seems like this wouldn't be an unusual addition.
Pitch
Add a --validate-after-epochs flag to configs.py
and to fairseq_cli/train.py
Alternatives
The work around to this is to just do so estimation on how many batches are in an epoch, or to start a task, let it run for one update so that you can see batches-per-epoch, then start it over with the correct value set.
Additional context
I already have a PR prepared for this (it's like a 5 line change), but my understanding is that things like this need to be approved via issues first.