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Prompt Engineering / GenAIml~12 mins

Hybrid search strategies in Prompt Engineering / GenAI - Model Pipeline Trace

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Model Pipeline - Hybrid search strategies

This pipeline combines two search methods: a fast approximate search and a precise exact search. It first narrows down options quickly, then carefully picks the best match. This helps find answers faster and more accurately.

Data Flow - 4 Stages
1Input query
1 query stringReceive user search query1 query string
"Find articles about climate change effects"
2Approximate search
1 query stringUse fast vector similarity to find top 100 candidates100 candidate documents
Top 100 documents with vectors close to query vector
3Exact search rerank
100 candidate documentsApply precise scoring (e.g., BM25 or cross-encoder) to rerank candidatesTop 10 ranked documents
Top 10 documents ranked by exact relevance score
4Final output
Top 10 ranked documentsReturn best matching documents to user10 documents
10 most relevant articles about climate change effects
Training Trace - Epoch by Epoch
Loss
1.0 | *       
0.8 |  *      
0.6 |   *     
0.4 |    *    
0.2 |     *   
0.0 +---------
      1 2 3 4 5 Epochs
EpochLoss ↓Accuracy ↑Observation
10.850.60Initial training with random weights, loss high, accuracy moderate
20.650.72Model learns basic patterns, loss decreases, accuracy improves
30.500.80Better ranking ability, loss continues to drop, accuracy rises
40.400.85Model converging, loss lower, accuracy higher
50.350.88Training stabilizes, good balance of speed and precision
Prediction Trace - 4 Layers
Layer 1: Query vectorization
Layer 2: Approximate search
Layer 3: Exact reranking
Layer 4: Return results
Model Quiz - 3 Questions
Test your understanding
Why does the hybrid search first use approximate search before exact reranking?
ATo avoid using any scoring methods
BTo increase the number of documents searched
CTo quickly reduce the number of documents to a manageable set
DTo return results without ranking
Key Insight
Hybrid search strategies combine speed and accuracy by first quickly filtering many options with approximate search, then carefully selecting the best matches with exact reranking. This balance improves search quality and user experience.