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Splits elements of a dataset into multiple elements on the batch dimension. (deprecated)

For example, if elements of the dataset are shaped [B, a0, a1, ...], where B may vary for each input element, then for each element in the dataset, the unbatched dataset will contain B consecutive elements of shape [a0, a1, ...].

# NOTE: The following example uses `{ ... }` to represent the contents
# of a dataset.
a = { ['a', 'b', 'c'], ['a', 'b'], ['a', 'b', 'c', 'd'] }

a.unbatch() == {
    'a', 'b', 'c', 'a', 'b', 'a', 'b', 'c', 'd'}

A Dataset transformation function, which can be passed to