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

1. The workaround to replace a leading slash in an OP name with wa/ is performed only when --output_signaturedefs is enabled.
2. Support for direct replacement of Slice OP with tf.strided_slice

• replace_slice.json sample Slice implements special replacements separately ignore all automatic conversions and generate tf.strided_slice directly by specifying all parameters of tf.strided_slice directly. https://www.tensorflow.org/api_docs/python/tf/strided_slice

  {
    "format_version": 1,
    "operations": [
      {
        "op_name": "/Slice",
        "param_target": "op",
        "begin": [0,0,1,0],
        "end": [0,0,0,0],
        "end_mask": 15
      },
      {
        "op_name": "/Slice_1",
        "param_target": "op",
        "begin": [0,0,0,0],
        "end": [0,0,39,0],
        "end_mask": 11
      }
    ]
  }
  

• Slice replacement by @PINTO0309 in https://github.com/PINTO0309/onnx2tf/pull/55

Full Changelog: https://github.com/PINTO0309/onnx2tf/compare/1.2.14...1.2.15