message: Clarify the need for calling tensorflow::port::InitMain() before using the rest of TensorFlow.
diff: @@ -19,10 +19,10 @@ limitations under the License.
  namespace tensorflow {
  namespace port {
  -// Platform-specific initialization routine that may be invoked by a
  +// Platform-specific initialization routine that should be invoked by a
  // main() program that uses TensorFlow.
  -//
  -// Default implementation does nothing.
  +// This performs necessary initialization on some platforms; TensorFlow
  +// may not work unless it has been called.
  void InitMain(const char* usage, int* argc, char*** argv);
  } // namespace port
  