message: Add tensorflow::ops prefix for {Read,Write}File
  ReadFile and WriteFile collide with the functions in windows.h. Tell MSVC we want Tensorflow's ones.
diff: @@ -53,7 +53,8 @@ tensorflow::Status WavToSpectrogram(const tensorflow::string& input_wav,
  // - Scales, clamps, and converts that spectrogram to 0 to 255 uint8's.
  // - Reshapes the tensor so that it's [height, width, 1] for imaging.
  // - Encodes it as a PNG stream and saves it out to a file.
  - Output file_reader = ReadFile(root.WithOpName("input_wav"), input_wav);
  + Output file_reader =
  + tensorflow::ops::ReadFile(root.WithOpName("input_wav"), input_wav);
  DecodeWav wav_decoder =
  DecodeWav(root.WithOpName("wav_decoder"), file_reader);
  Output spectrogram = AudioSpectrogram(root.WithOpName("spectrogram"),
  @@ -71,8 +72,8 @@ tensorflow::Status WavToSpectrogram(const tensorflow::string& input_wav,
  Output squeeze = Squeeze(root.WithOpName("squeeze"), expand_dims,
  Squeeze::Attrs().Axis({0}));
  Output png_encoder = EncodePng(root.WithOpName("png_encoder"), squeeze);
  - WriteFile file_writer =
  - WriteFile(root.WithOpName("output_image"), output_image, png_encoder);
  + tensorflow::ops::WriteFile file_writer = tensorflow::ops::WriteFile(
  + root.WithOpName("output_image"), output_image, png_encoder);
  tensorflow::GraphDef graph;
  TF_RETURN_IF_ERROR(root.ToGraphDef(&graph));
  