GH-1198: Added option to evaluate on the (subset of) train split. #1202
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PR implements option to evaluate on the subset of train split via parameters of trainer function:
eval_on_train_fraction
: The fraction of train data to do the evaluation on. If 0. the evaluation is not performed on fraction of training data. If 'dev' the size is determined from dev set size.eval_on_train_shuffle
: IfTrue
the train data fraction is determined on the start of training and kept fixed during training, otherwise it's sampled at beginning of each epoch.