Fix crash when using --distributed
#114
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The distributed mode (evaluation in parallel) uses a world size greater than 1, by definition. However,
WebDatasetdefaultnodesplittersupposes that the dataset will be sharded throughout multiple nodes if using the distributed mode, which is not the case here (each node gets a different dataset).WebDatasetdefaultnodesplitteruses a sanity check for this, and the program crashes. This change substitutes the defaultnodesplitterfunction with an identity function (the same functionality as before) but without this assertion.