*   Fix `tf.sqrt` handling of negative arguments.
*   Fixed bug causing incorrect number of threads to be used for multi-threaded
    benchmarks.
*   Performance optimizations for `batch_matmul` on multi-core CPUs.
*   Improve trace, `matrix_set_diag`, `matrix_diag_part` and their gradients to
    work for rectangular matrices.
*   Support for SVD of complex valued matrices.