What's the difference between train.txt and val.txt?

There are four data files: src-train.txt, target-train.txt, src-val.txt, tgt-val.txt in OpenNMT.

I know that the difference between src and target is language.
But I can’t guess what the difference is between a train and val file.

Could you explain about it? Thank you :slight_smile:

This post should help:

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I didn’t know the abbreviation for ‘val’ was validation. :sweat_smile:
Thank you so much.