including complex types (if supported): `tf.math.segment_prod`,
        `tf.math.segment_sum`, `tf.math.unsorted_segment_mean`,
        `tf.math.unsorted_segment_sqrt_n`, `tf.math.unsorted_segment_prod`,
        `tf.math.unsorted_segment_sum`, and therefore also
        `tf.convert_to_tensor` when `value` is of type `tf.IndexedSlices` (such
        as in the back prop though `tf.gather` into a dense embedding). See