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SUMMARY:Retrieval strategies: semantic\, lexical\, hybrid retrieval\, HyDE
 \, RRF and reranking
DTSTART;VALUE=DATE-TIME:20260707T100500Z
DTEND;VALUE=DATE-TIME:20260707T103000Z
DTSTAMP;VALUE=DATE-TIME:20260703T180736Z
UID:indico-contribution-1152@events.grnet.gr
DESCRIPTION:Speakers: George  Drosatos (ATHENA RC)\nThis methodology sessi
 on examines the retrieval stage\, which determines what evidence the langu
 age model can use when generating an answer. It compares dense semantic re
 trieval\, sparse keyword retrieval\, structured retrieval and hybrid retri
 eval\, explaining when each modality is useful. Participants will see why 
 semantic search is valuable for paraphrases and user-friendly language\, w
 hile keyword or BM25-style search is important for exact administrative te
 rms\, identifiers\, article numbers\, dates and rare phrases. The session 
 also introduces query enhancement techniques such as rewriting\, expansion
  and HyDE\, which can bridge the gap between conversational user queries a
 nd formal source language. It then explains fusion\, Reciprocal Rank Fusio
 n and reranking as ways to combine complementary retrieval signals and imp
 rove the final Top-K evidence. Participants will understand how retrieval 
 choices affect recall\, precision\, context noise\, latency and final answ
 er reliability. The session prepares participants to experiment with these
  choices in tutorial exercises using realistic Greek queries.\n\nhttps://e
 vents.grnet.gr/event/213/contributions/1152/
LOCATION:
URL:https://events.grnet.gr/event/213/contributions/1152/
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