*   Added gradient for `SparseToDense` op.
    *   Expose a flag that allows the number of threads to vary across Python
        benchmarks.
    *   `image.resize` in 2.0 now supports gradients for the new resize kernels.
    *   `image.resize` now considers proper pixel centers and has new kernels
        (incl. anti-aliasing).
    *   Renamed `tf.image` functions to remove duplicate "image" where it is
        redundant.

    // We can provide a hint to the builder to preallocate the correct size when the iterable is
    // either a List (which likely has a fast size() implementation), or an ImmutableCollection
    // (which definitely has a fast size() implementation). While Collection also has a size()
    // implementation, it _may_ require iteration over the entire collection (e.g., a

    // We can provide a hint to the builder to preallocate the correct size when the iterable is
    // either a List (which likely has a fast size() implementation), or an ImmutableCollection
    // (which definitely has a fast size() implementation). While Collection also has a size()
    // implementation, it _may_ require iteration over the entire collection (e.g., a