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Author

Haggai Roitman

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Book Open access Sep 2026

Not All Branches Are Equal: Adaptive Semantic ID Construction for Generative Recommendation

Generative recommendation models represent items as sequences of discrete tokens known as semantic IDs. Existing approaches derive these identifiers using residual or hierarchical vector quantization, assuming that tokens carry independent semantic meaning across quantization levels. Revisiting this assumption, we argu...

Guy Hadad, Haggai Roitman, Bracha Shapira · 0 citations

The Hitchhiker's Guide to Agentic AI: From Foundations to Systems

The Hitchhiker's Guide to Agentic AI is a comprehensive practitioner's reference for building autonomous AI systems, covering the full stack from first principles to production deployment. The central thesis: building great agentic systems requires understanding every layer of the pipeline, not just one. The book opens...

Haggai Roitman · 0 citations

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