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# tf.raw_ops.SparseConcat

Concatenates a list of `SparseTensor` along the specified dimension.

Concatenation is with respect to the dense versions of these sparse tensors. It is assumed that each input is a `SparseTensor` whose elements are ordered along increasing dimension number.

All inputs' shapes must match, except for the concat dimension. The `indices`, `values`, and `shapes` lists must have the same length.

The output shape is identical to the inputs', except along the concat dimension, where it is the sum of the inputs' sizes along that dimension.

The output elements will be resorted to preserve the sort order along increasing dimension number.

This op runs in `O(M log M)` time, where `M` is the total number of non-empty values across all inputs. This is due to the need for an internal sort in order to concatenate efficiently across an arbitrary dimension.

For example, if `concat_dim = 1` and the inputs are

``````sp_inputs[0]: shape = [2, 3]
[0, 2]: "a"
[1, 0]: "b"
[1, 1]: "c"

sp_inputs[1]: shape = [2, 4]
[0, 1]: "d"
[0, 2]: "e"
``````

then the output will be

``````shape = [2, 7]
[0, 2]: "a"
[0, 4]: "d"
[0, 5]: "e"
[1, 0]: "b"
[1, 1]: "c"
``````

Graphically this is equivalent to doing

``````[    a] concat [  d e  ] = [    a   d e  ]
[b c  ]        [       ]   [b c          ]
``````

`indices` A list of at least 2 `Tensor` objects with type `int64`. 2-D. Indices of each input `SparseTensor`.
`values` A list with the same length as `indices` of `Tensor` objects with the same type. 1-D. Non-empty values of each `SparseTensor`.
`shapes` A list with the same length as `indices` of `Tensor` objects with type `int64`. 1-D. Shapes of each `SparseTensor`.
`concat_dim` An `int`. Dimension to concatenate along. Must be in range [-rank, rank), where rank is the number of dimensions in each input `SparseTensor`.
`name` A name for the operation (optional).

A tuple of `Tensor` objects (output_indices, output_values, output_shape).
`output_indices` A `Tensor` of type `int64`.
`output_values` A `Tensor`. Has the same type as `values`.
`output_shape` A `Tensor` of type `int64`.

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