Update README.md

README.md

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-## Glossary [optional]
+## Glossary
 
 Exact Match (EM): A metric measuring the percentage of predictions that match the ground truth exactly.
-F1 Score: The harmonic mean of precision and recall, used for evaluating the quality of the predictions.
 Masked Language Model (MLM): Pre-training objective for BERT, predicting masked words in input sentences.