Onnxconverter-common

e87c572 port the topology bug fixing. (49)
2ffbcad Support dynamic inputs for apply_slice (48)
7185620 A better operator builder for ONNXConverter-Common (46)
c452903 Support dynamic pads for Pad opset 11 (45)
9bc1744 Use axes for Squeeze/Unsqueeze (44)
66f8887 Allow repeats be string type for apply_tile (43)
47a6c35 Add apply_conv (42)
98ee169 Add apply_squeeze (40)
82f08ed Add apply_gather, apply_greater, apply_gru, etc (39)
672c5f7 Reformat and clean up some codes.
f684aeb Use coordinate_transformation_mode as default parameter (tf 2.0 will change it) (38)
85e9bcf Add support for detecting if h2o is installed. (37)
b5f216b Handle dynamic shape in apply_reshape (36)
b9700d1 Handle case input_name is list for apply_reshape (35)
511a071 Generate graph after optimizing onnx model (34)

A patch release for the issue if there is a new onnx release.

Major updates:
1. Support opset 11
2. Add fp16 conversion on attributes

Major updates:
1. Fix pad computation for auto_pad=NOTSET in MergePadConvSolution
2. Support min.shape=0 case for apply_clip

Major updates:

1. Update Clip operator
2. Fix on optimization, unit test added.

Major update:
1. Perform topological sorting on node list when we make onnx model.
2. Several changes on optimizer.