haystack

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enhancements:
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    Adds scale_score, which allows users to toggle if they would like their document scores to be raw logits or scaled between 0 and 1 (using the sigmoid function). This is a feature that already existed in Haystack v1 that is being moved over.
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    Adds calibration_factor. This follows the example from the ExtractiveReader which allows the user to better control the spread of scores when scaling the score using sigmoid.
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    Adds score_threshold. Also copied from the ExtractiveReader. This optionally allows users to set a score threshold where only documents with a score above this threshold are returned.
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