open source release was already scalar strict, so outside Google `IsScalar`
    and `IsVector` are exact replacements.
*   The following files are being removed from `tensorflow/core/public/`:
    *   `env.h` -> `../platform/env.h`
    *   `status.h` -> `../lib/core/status.h`
    *   `tensor.h` -> `../framework/tensor.h`
    *   `tensor_shape.h` -> `../framework/tensor_shape.h`