weighting is done on linear magnitude spectra (sqrt of inputs).
    *   Change `tf.contrib.distributions` docstring examples to use `tfd` alias
        rather than `ds`, `bs`.
    *   Fix docstring typos in `tf.distributions.bijectors.Bijector`.
    *   `tf.assert_equal` no longer raises `ValueError.` It now raises
        `InvalidArgumentError,` as documented.