Customer-obsessed science
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October 29, 20265 min readTwo optimization techniques, when combined, can significantly improve a model’s speed and cost effectiveness without sacrificing quality.
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October 20, 20263 min read
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October 12, 202614 min read
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Featured news
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2026Group relative policy optimization for reinforcement learning with verifiable rewards (RLVR) typically uses a fixed importance-sampling (IS) ratio clipping boundary across all rollouts. We identify a key limitation: rare correct rollouts on harder problems and abundant correct rollouts on easier problems are clipped at comparable rates, despite contributing very different learning signals. Rollouts with
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2026Synthetic dialogue corpora are increasingly used as proxies for target data, yet personagrounded generators optimize individual conversations rather than corpus composition, yielding plausible dialogues with distorted population-level behavior mixes. We introduce GroupPersona, a framework that aligns synthetic corpora with a reference behavior distribution. GroupPersona turns population statistics into
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RecSys 20262026We present a production-scale playlist curation system on Amazon Music that leverages modular architecture and holistic LLM-powered reasoning to generate playlists. Our system leverages LLMs to reason over rich track metadata—including genre, mood, era, sonic descriptions, and artist context—to select cohesive track sets that satisfy both relevance and coherence criteria. We formulate the curation task
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2026Matching users to interest categories at scale is central to personalized shopping, but the task is challenging in large e-commerce platforms, where label spaces continually evolve and user-interest signals are sparse and long tailed. Autoregressive language models are appealing because their world knowledge and semantic priors over descriptors generalize across extreme label spaces and accommodate multiple
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2026Memory makes LLM-based web agents personalized, powerful, yet exploitable. By storing past interactions to personalize future tasks, agents inadvertently create a persistent attack surface that spans websites and sessions. While existing security research on memory assumes attackers can directly inject into memory storage or exploit shared memory across users, we present a more realistic threat model: contamination
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