def map_fn(shape):
    dense_to_sparse = self._make_dense_to_sparse_fn(False)
    return dense_to_sparse(array_ops.zeros(shape, dtype=dtype))
def map_fn(shape):
    dense_to_sparse = self._make_dense_to_sparse_fn(False)
    return dense_to_sparse(array_ops.zeros(shape, dtype=dtype))