Cheat at Search Essentials: BM25 + Lexical
Hosted by Doug Turnbull
Fri, Sep 19, 2025
4:30 PM UTC (45 minutes)
Virtual (Zoom)
Free to join
Go deeper with a course


Fri, Sep 19, 2025
4:30 PM UTC (45 minutes)
Virtual (Zoom)
Free to join
62 students
Go deeper with a course


What you'll learn
Basics of Information Retrieval
The importance of tokenization
Cheat at semantic search without the vectors
Why this topic matters
You'll learn from
Doug Turnbull
Principal AI Engineer in Search
Doug Turnbull is an expert in search technology and relevance engineering, currently serving as Principal Engineer at Daydream, where he builds hybrid search systems combining lexical and vector retrieval, and develops LLM-driven quality programs for e-commerce search. Previously, he led machine-learning-driven search initiatives at Reddit, significantly improving search relevance through Learning to Rank methods. Doug also advanced e-commerce search at Shopify and served as CTO at OpenSource Connections. He co-authored the influential book Relevant Search (Manning, 2016) and created popular open-source tools, including Quepid and the Elasticsearch Learning to Rank plugin. He regularly speaks at industry conferences, making search relevance accessible to engineers.
Previously at
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