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First-place official system for JOKER 2026 (CLEF) Task 1 English: a three-stage humor retrieval pipeline pairing hybrid sparse-dense retrieval and cross-encoder reranking with a rationale-distilled LLM judge ensemble. 0.6347 MAP. Team VANGUARD.
Built an advanced Retrieval-Augmented Generation (RAG) system utililzing text datasets chunked dynamically. Engineered a dual-stage retrieval pipeline using all-MiniLM-L6-v2 embeddings to pull 20 FAISS candidates, refined via Cross-Encoders to feed the top 5 most relevant chunks to the LLM Synthesized context with a fine-tuned Qwen2.5-1.5B-Instruct