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Reduce overhead in sg_onednn_fully_connected for floats #21092
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Description
Subgraph fully connected implementation introduces overhead in float execution path - this change removes this overhead:
Benchmark on GPT-2 sample generation from gluon-nlp scripts on AWS.c6i.x12large
![image](https://user-images.githubusercontent.com/59644968/178224005-a7fd650e-b1ea-4dfb-b0d7-56c672bcaa2f.png)
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