Confidence-Calibrated Ensemble Dense Phrase Retrieval

William Yang; Noah Bergam; Arnav Jain; Nima Sheikhoslami

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arXiv · 2306.15917

Confidence-Calibrated Ensemble Dense Phrase Retrieval

William Yang·Noah Bergam·Arnav Jain·Nima Sheikhoslami

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Abstract

In this paper, we consider the extent to which the transformer-based Dense Passage Retrieval (DPR) algorithm, developed by (Karpukhin et. al. 2020), can be optimized without further pre-training. Our method involves two particular insights: we apply the DPR context encoder at various phrase lengths (e.g. one-sentence versus five-sentence segments), and we take a confidence-calibrated ensemble prediction over all of these different segmentations. This somewhat exhaustive approach achieves start-of-the-art results on benchmark datasets such as Google NQ and SQuAD. We also apply our method to domain-specific datasets, and the results suggest how different granularities are optimal for different domains

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William Yang, Noah Bergam, Arnav Jain, Nima Sheikhoslami. 2023-06-28. Confidence-Calibrated Ensemble Dense Phrase Retrieval. https://arxiv.org/abs/2306.15917

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