Do not consume unnecessary memory during sharding #7136
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There is no need to create a temporary list of a potentially very large step/world size.
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Patching can be removed once LLM Foundry uses a `datasets` version that has huggingface/datasets#7136 integrated.
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When sharding
IterableDatasets, a temporary list is created that is then indexed. There is no need to create a temporary list of a potentially very large step/world size, with standardislicefunctionality, so we avoid it.Runs successfully.