[relay][op] add expand op (from ONNX) to relay frontend#4483

Merged

zhiics merged 5 commits intoapache:masterfrom ymd8bit:feature/add_expand_op

Dec 18, 2019

+88

Commits on Dec 17, 2019

Add Expand to onnx.py
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add test function for expand
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Fix a onnx frontend test
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Add tests for the value itself instead of shape only on test_expand
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Commits on Dec 18, 2019

Cleaned up some unnecessary modifications.
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