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# tf.ragged.stack

Stacks a list of rank-`R` tensors into one rank-`(R+1)` `RaggedTensor`.

Given a list of tensors or ragged tensors with the same rank `R` (`R >= axis`), returns a rank-`R+1` `RaggedTensor` `result` such that `result[i0...iaxis]` is `[value[i0...iaxis] for value in values]`.

#### Example:

``````>>> t1 = tf.ragged.constant([[1, 2], [3, 4, 5]])
>>> t2 = tf.ragged.constant([, [7, 8, 9]])
>>> tf.ragged.stack([t1, t2], axis=0)
[[[1, 2], [3, 4, 5]], [, [7, 9, 0]]]
>>> tf.ragged.stack([t1, t2], axis=1)
[[[1, 2], ], [[3, 4, 5], [7, 8, 9]]]
``````

`values` A list of `tf.Tensor` or `tf.RaggedTensor`. May not be empty. All `values` must have the same rank and the same dtype; but unlike `tf.stack`, they can have arbitrary dimension sizes.
`axis` A python integer, indicating the dimension along which to stack. (Note: Unlike `tf.stack`, the `axis` parameter must be statically known.) Negative values are supported only if the rank of at least one `values` value is statically known.
`name` A name prefix for the returned tensor (optional).

A `RaggedTensor` with rank `R+1`. `result.ragged_rank=1+max(axis, max(rt.ragged_rank for rt in values]))`.

`ValueError` If `values` is empty, if `axis` is out of bounds or if the input tensors have different ranks.

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