Elasticsearch - Search Results and Scoring
An Elasticsearch query using TF-IDF similarity returns unexpected low scores for rare terms. What could be the problem?
An Elasticsearch query using TF-IDF similarity returns unexpected low scores for rare terms. What could be the problem?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze low scores for rare terms
Rare terms should have high IDF, so low scores suggest IDF is disabled or zero.Step 2: Exclude other causes
High term frequency or length normalization affect BM25 more; BM25 use would not cause low rare term scores in TF-IDF context.Final Answer:
IDF is disabled or set to zero in the similarity settings -> Option BQuick Check:
IDF off causes low rare term scores = IDF is disabled or set to zero in the similarity settings [OK]
Quick Trick: Rare terms need IDF enabled for high TF-IDF scores [OK]
Common Mistakes:
MISTAKES- Confusing term frequency saturation with IDF
- Assuming BM25 causes low rare term scores
- Ignoring IDF setting in similarity
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