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* Add option to use MultipleNegativesRankingLoss Add option to use MultipleNegativesRankingLoss for EmbeddingRetriever training with sentence-transformers * Move out losses into separate retriever/_losses.py module * Remove unused import in retriever/_losses.py * Apply documentation suggestions from code review Co-authored-by: Agnieszka Marzec <97166305+agnieszka-m@users.noreply.github.com> Co-authored-by: Agnieszka Marzec <97166305+agnieszka-m@users.noreply.github.com>