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Serialize a SparseTensor into a 3-vector (1-D Tensor) object.

sp_input The input SparseTensor.
out_type The dtype to use for serialization.
name A name prefix for the returned tensors (optional).

A 3-vector (1-D Tensor), with each column representing the serialized SparseTensor's indices, values, and shape (respectively).

TypeError If sp_input is not a SparseTensor.