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fix: normalize rerank score to 0-1 range when only one document #87

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fix: normalize rerank score to 0-1 range when only one document #87

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3 changes: 3 additions & 0 deletions python/dify_plugin/interfaces/model/openai_compatible/rerank.py
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,9 @@ def _invoke(
scores = [result["relevance_score"] for result in results["results"]]

# Min-Max Normalization: Normalize scores to 0 ~ 1.0 range
if len(scores) == 1:
scores.append(0)

min_score = min(scores)
max_score = max(scores)
score_range = max_score - min_score if max_score != min_score else 1.0 # Avoid division by zero
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