the same sequence of elements as `Dataset.shuffle(..., seed=0)`.
    *   Add `num_parallel_reads` argument to `tf.data.TFRecordDataset`.
*   `tf.contrib`:
    *   `tf.contrib.bayesflow.halton_sequence` now supports randomization.
    *   Add support for scalars in `tf.contrib.all_reduce`.
    *   Add `effective_sample_size` to `tf.contrib.bayesflow.mcmc_diagnostics`.
    *   Add `potential_scale_reduction` to