Take gradient accumulation into account when defining samplers #15095
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What does this PR do?
This PR takes the gradient accumulation steps into account when defining samplers that use the batch size (like the
LengthGroupedSampler) so that training with large batch size or training with smaller batch size and gradient accumulation (e.g. batch size 64 or batch size 8 and gradient accumulation steps of 8) yield the same results.Fixes #14638