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Asserts that the given tensor is a scalar.

This function raises ValueError unless it can be certain that the given tensor is a scalar. ValueError is also raised if the shape of tensor is unknown.

This is always checked statically, so this method returns nothing.

tensor A Tensor.
message A string to prefix to the default message.
name A name for this operation. Defaults to "assert_scalar"

ValueError If the tensor is not scalar (rank 0), or if its shape is unknown.