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What does this PR do?
DataCollatorForSeq2Seq
currently only supports thelongest
and silently theno_padding
strategies. This PR adds some checks to ensure the padding strategy is respected if valid (e.g.max_length
without a given max length defaults back tolongest
).Furthermore, added tests for the collator in the style of the
DataCollatorForTokenClassification
for all kinds of supported datatypes (pt, tf, np).Something to note: The seq2seq collator causes side effects on the features' labels that are passed. I don't think it's a big deal but thought I'd clarify why I produce features twice within a single test.
Fixes #30521
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@Rocketknight1 @amyeroberts