Refactor ContrastiveDataset and ContrastiveDistillationDataset #579
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…with bigger dataset
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Refactor of ContrastiveDataset and ContrastiveDistillationDataset to generate pairs lazily. Also the trainer code is updated to create dataset from iterator. This targets how pairs are generated more motivation - #578
dataset = Dataset.from_generator(data_sampler.__iter__)this change allows to work with arbitrary big dataset (although the trade off is the cache on the disk managed by arrow dataset)This also targets the ContrastiveDistillationDataset bug in #578
fixes: #578