Support new onnx signal operators

[hwangdeyu]

There are several signal operators added in ONNX 1.12.
Tracking issue for it.

• DFT
  ONNX: https://github.com/onnx/onnx/blob/main/docs/Operators.md#DFT
  TensorFlow: https://www.tensorflow.org/api_docs/python/tf/signal/fft
  https://www.tensorflow.org/api_docs/python/tf/signal/ifft
• STFT
  ONNX: https://github.com/onnx/onnx/blob/main/docs/Operators.md#STFT
  TensorFlow: https://www.tensorflow.org/api_docs/python/tf/signal/stft
• HannWindow
  ONNX: https://github.com/onnx/onnx/blob/main/docs/Operators.md#HannWindow
  TensorFlow: https://www.tensorflow.org/api_docs/python/tf/signal/hann_window
• HammingWindow
  ONNX: https://github.com/onnx/onnx/blob/main/docs/Operators.md#HammingWindow
  TensorFlow: https://www.tensorflow.org/api_docs/python/tf/signal/hamming_window
• MelSpectrogram
  ONNX: https://github.com/onnx/onnx/blob/main/docs/Operators.md#MelWeightMatrix
  TensorFlow: https://www.tensorflow.org/api_docs/python/tf/signal/linear_to_mel_weight_matrix

[Yannick947]

Is there anyone working on this issue?
Tensorflow models using these operations cannot be exported properly without using this hacky workaround that requires to install yet another library..

The opset is already implemented in plain onnx, so there is nothing blocking from implementing this feature for tf2onnx?

[Yilmazzn]

Ran into the same problem. It would be awesome to see this feature implemented soon

[vasanthaganeshk]

Is there anyone working on this issue? Tensorflow models using these operations cannot be exported properly without using this hacky workaround that requires to install yet another library..

The opset is already implemented in plain onnx, so there is nothing blocking from implementing this feature for tf2onnx?

Hello @Yannick947 the link has expired, can you share the link again?