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Summary:
The AlternatingRandomizedBatchSampler is a RandomizedBatchSampler that alternates creating batches from two sets of keys. It takes two dictionaries of unnormalized iterator probabilities and chooses a batch using a key from the first dictionary using the corresponding probabilities and then a batch from the other dictionary the next round.
The AlternatingRandomizedBatchSampler is intended to be used during XLM pre-training to enforce a pattern of MLM, TLM, MLM, TLM tasks.
Differential Revision: D15931223