Add negatives in CachedGISTEmbedLoss #2946
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Many papers train with multiple negatives. Also, MultipleNegativesRankingLoss allows multiple negatives. However, GISTEmbedLoss can currently only train with one negative. Therefore, to overcome this limitation, we modified it to train with multiple negatives. The currently modified code changes CachedGISTEmbedLoss.py to train with multiple negatives.