Customer-obsessed science

Next-basket recommendation (NBR) in online grocery must capture both habitual repeat purchases and explore behavior. We propose BasketFormer, a Transformer encoder trained with a contrastive masked language modeling (C-MLM) objective that unifies three innovations: (1) an InfoNCE-based MLM loss replacing the full-vocabulary softmax with in-batch contrastive scoring; (2) a bit-level temporal encoding that

Language models struggle to generalize beyond pretraining context lengths, limiting long-horizon reasoning and retrieval. Continued long-context training is effective but expensive due to the quadratic cost of Attention. We observe that most tokens do not require (Global) Attention over the entire sequence and can rely on local context. Based on this, we propose L2A (Learning To Attend), a layer that enables

Hallucination, broadly referring to unfaithful, fabricated, or inconsistent content generated by LLMs, has wide-ranging implications. Therefore, a large body of effort has been devoted to detecting LLM hallucinations, as well as designing benchmark datasets for evaluating these detectors. In this work, we first establish a desiderata of properties for hallucination detection benchmarks (HDBs) to exhibit

Self-distilled policy optimization (SDPO) has become a popular paradigm for LLM post-training, where a model learns from its own predictions conditioned on privileged information. SDPO, however, is sensitive to how much each update step should be trusted: corrections from a self-teacher can be highly informative on some batches and misleading on others, and applying them uniformly with a fixed step size

Current AI-powered code assistance tools often struggle with poorly-defined problem statements that lack sufficient task context and requirements specification. Recent analysis of software engineering agents reveals that failures on such underspecified requests are highly correlated with longer trajectories involving either over-exploration or repeated attempts at applying the same fix without proper evolution