libraries and headers.
    *   TF code now resides in `tensorflow_core` and `tensorflow` is just a
        virtual pip package. No code changes are needed for projects using
        TensorFlow, the change is transparent
*   XLA
    *   XLA HLO graphs can be inspected with interactive_graphviz tool now.
*   Estimator
    *   Use tf.compat.v1.estimator.inputs instead of tf.estimator.inputs

pkg image, type YCbCr struct, YStride int
pkg image, type YCbCrSubsampleRatio int
pkg image, var Black *Uniform
pkg image, var ErrFormat error
pkg image, var Opaque *Uniform
pkg image, var Transparent *Uniform
pkg image, var White *Uniform
pkg image, var ZP Point
pkg image, var ZR Rectangle
pkg image/color, func ModelFunc(func(Color) Color) Model