{"type":"raw_signal","id":"castle-training-natural-language-search-before-the-first-06a78f","slug":"castle-training-natural-language-search-before-the-first-06a78f","title":"CASTLE: training natural language search before the first real query","description":"## Airbnb introduces CASTLE for natural-language search cold start","retrieval_nugget":"## Airbnb introduces CASTLE for natural-language search cold start","observed_at":"2026-10-13","record_date":"2026-10-13","date_kind":"observed_at","why_it_matters":"The company reports a KL divergence of 1.01 between generated and real query distributions, compared with 9.33 for its best baseline. In a human evaluation of 200 triplets, three subject-matter experts agreed with relevance assignments at rates of 91–93%. For cases without contrastive booking data, including newly listed properties, Airbnb says it supplements the method with an LLM-based Virtual J","novelty":"notable","verification_level":"source-linked","signal_type":"research","source_platform":"airbnb.tech","topics":[],"entities":["Airbnb","CASTLE","CIKM 2026"],"related_patterns":[],"source_url":"https://airbnb.tech/ai-ml/castle-training-natural-language-search-before-the-first-real-query","source_urls":["https://airbnb.tech/ai-ml/castle-training-natural-language-search-before-the-first-real-query"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"signal:castle-training-natural-language-search-before-the-first-06a78f","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/signals/castle-training-natural-language-search-before-the-first-06a78f/","markdown":"https://newruntime.com/signals/castle-training-natural-language-search-before-the-first-06a78f.md","json":"https://newruntime.com/signals/castle-training-natural-language-search-before-the-first-06a78f.json"},"next_reads":[{"type":"collection","path":"/signals/","url":"https://newruntime.com/signals/","title":"Raw Signals","reason":"Open every source-linked raw signal.","media_type":"text/html","json_url":"https://newruntime.com/signals.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}