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Concats all tensors in the list along the 0th dimension.

Requires that all tensors have the same shape except the first dimension.

input_handle: The input list. tensor: The concated result. lengths: Output tensor containing sizes of the 0th dimension of tensors in the list, used for computing the gradient.

input_handle A Tensor of type variant.
element_dtype A tf.DType.
element_shape An optional tf.TensorShape or list of ints. Defaults to None.
name A name for the operation (optional).

A tuple of Tensor objects (tensor, lengths).
tensor A Tensor of type element_dtype.
lengths A Tensor of type int64.