Fixes in CRF #9
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Fixes in CRF #9
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This PR customize CRF layers to remove attention from padded tokens and ignore -100 tagged entity while scoring.
Benchmarks on Inspec:
BERT BIO tagging f1 : 51.8
KBIR BIO tagging f1: 58.15
KBIR + CRF BIO tagging: 60.03