[feat] MultipleNegativesBatchSampler
#2960
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…tence-transformers into Prompting-on-evaluators
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As discussed in #2954, this adds a new sampler that can handle multiple hard negatives per anchor.
It does that by allowing that the dataset have more than three columns, and assumes that first column is the anchor, the second the positive and the remaining columns negatives. It will only skip samples if any of the negatives for a sample are already in the batch's positives or queries.
No de-duplication is applied to the negatives.