title: How could I convert trained model from ONNX to PyTorch
body: <p>I have a trained model in ONNX format.
  <a href="https://github.com/onnx/models/tree/main/vision/object_detection_segmentation/faster-rcnn" rel="nofollow noreferrer">https://github.com/onnx/models/tree/main/vision/object_detection_segmentation/faster-rcnn</a></p>
  <p>I need to convert it to PyTorch to make some modification with outputs like change number of classes, get network to tune on my dataset.</p>