Stacks a list of rank-`R` tensors into one rank-`(R+1)` tensor. Packs the list of tensors in `values` into a tensor with rank one higher than each tensor in `values`, by packing them along the `axis` dimension. Given a list of length `N` of tensors of shape `(A, B, C)`; if `axis == 0` then
(values, axis=0, name="stack")
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