'FC' vs 'GEMM' in nnvm/frontend/onnx.py (awaiting for answers .)

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Basically FC (fully connected layer ) performs Gemm operation .But there are two separate operators in frontend/onnx.py - _get_convert_map() function .(though both calls ‘dense’ operator !)

how different is ‘FC’ from ‘Gemm’ in onnx.py ?

Thanks.