Tools to convert ONNX files (NCHW) to TensorFlow format (NHWC)

• Improved conversion stability when multiple undefined dimensions exist in the input tensor.
• Gather
  • Fix parameter substitution logic.
  • Cannot use converted model with dynamic input shape #521
  • retinaface_onnx_dynamic.onnx.zip
  • https://github.com/PINTO0309/onnx2tf/blob/main/json_samples/replace_retinaface_dynamic_shape.json |onnx|tflite| |:-:|:-:| |||
• onnx2tf.py
  • Fix parameter replacement logic.
• Concat, common_functions.py
  • Added the ability to swap axes using Gather instead of Transpose when the tensor to be concatenated is a 1D tensor.

• Fix Gather parameter substitution logic by @PINTO0309 in https://github.com/PINTO0309/onnx2tf/pull/522

Full Changelog: https://github.com/PINTO0309/onnx2tf/compare/1.18.1...1.18.2