[Datasets] Transmit format to children
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Closing as #607 was merged
2020-09-10T16:15:21Z
https://github.com/huggingface/datasets/pull/605#issuecomment-690427040
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2020-09-10T16:15:21Z
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Transmit format to children obtained when processing a dataset.

Added a test.

When concatenating datasets, if the formats are disparate, the concatenated dataset has a format reset to defaults.