find yourself using this escape hatch.
    *   Add description of shapes and a pointer to tutorial notebook in
        `tf.distributions.Distribution`.
    *   Update scatter operations:
    *   Add `tf.scatter_min` and `tf.scatter_max`
    *   Extend scatter operations to work with a scalar update parameter.
    *   Move cuDNN RNN ops to core for use in TensorFlow codebase only.