arXiv:2602.17842v1 Announce Type: new Abstract: Global illicit fund flows exceed an estimated $3.1 trillion annually, with stablecoins emerging as a preferred laundering medium due to their liquidity. While decentralized protocols increasingly adopt zero-knowledge proofs to obfuscate transaction graphs, centralized stablecoins remain critical “transparent choke points” for compliance. Leveraging this persistent visibility, this study analyzes an Ethereum dataset and uses behavioral features to develop a robust AML framework. Our findings demonstrate that domain-informed tree ensemble models achieve higher Macro-F1 […]

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Introduction Today’s global digital platforms are powered by hundreds of microservices that run behind the frontend that users are exposed to. These services all have to operate at scale in conjunction with each other. Hence, the ultimate user experience is determined by the composite availability of these systems, engineered so that the final service continues to operate even if subsystems experience outages. Talking about availability standards of 5 9s, systems that are available 99.999% of the time are […]

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arXiv:2603.05574v1 Announce Type: new Abstract: This paper presents PRISM: an instruction-conditioned refinement method for imitation policies in robotic manipulation. This approach bridges Imitation Learning (IL) and Reinforcement Learning (RL) frameworks into a seamless pipeline, such that an imitation policy on a broad generic task, generated from a set of user-guided demonstrations, can be refined through reinforcement to generate new unseen fine-grain behaviours. The refinement process follows the Eureka paradigm, where reward functions for RL are iteratively generated from […]

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arXiv:2602.23547v1 Announce Type: new Abstract: Sentences like “She will go to France or Spain, or perhaps to Germany or France.” appear formally redundant, yet become acceptable in contexts such as “Mary will go to a philosophy program in France or Spain, or a mathematics program in Germany or France.” While this phenomenon has typically been analyzed using symbolic formal representations, we aim to provide a complementary account grounded in artificial neural mechanisms. We first present new behavioral evidence […]

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This paper reflects on a AI research project carried out by a team of high-school and early-undergraduate students under the mentorship of graduate researchers and ably assisted by AI tools. We share our experience in not only on the learning experience for the high school students, but also on how AI tools accelerated the process that enabled the high school students to focus on higher order problem formulation and solution. Although the participants entered the project with limited […]

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arXiv:2601.05262v1 Announce Type: new Abstract: Modern dense information retrieval (IR) models usually rely on costly large-scale pretraining. In this paper, we introduce LLM2IR, an efficient unsupervised contrastive learning framework to convert any decoder-only large language model (LLM) to an information retrieval model. Despite its simplicity, the effectiveness is proven among different LLMs on multiple IR benchmarks including LoCo, LongEmbed and BEIR. We also find that models with a longer context length tend to have a stronger IR capacity […]

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arXiv:2603.07005v1 Announce Type: cross Abstract: A matching platform is a system that matches different types of participants, such as companies and job-seekers. In such a platform, merely maximizing the number of matches can result in matches being concentrated on highly popular participants, which may increase dissatisfaction among other participants, such as companies, and ultimately lead to their churn, reducing the platform’s profit opportunities. To address this issue, we propose a novel online learning problem, Combinatorial Allocation Bandits (CAB), […]

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Hi everyone, Michael Reilly here. As March draws to a close—and we wrap up the month with an investigation into how NYC’s AI-powered bot tells people to break the law—I’ve been asking around the newsroom to find out what else has captured my colleagues’ interest and fascination over the last month. Below you’ll find an eclectic mix of the things that we read, play, listen to, and otherwise feed our brains with when we’re not heads down doing […]

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arXiv:2602.00952v1 Announce Type: new Abstract: The trade-off between labeled data availability and downstream accuracy remains a central challenge in fine-tuning large language models (LLMs). We propose a principled framework for emph{budget-aware supervised fine-tuning} by casting LLM adaptation as a contextual Stackelberg game. In our formulation, the learner (leader) commits to a scoring policy and a label-querying strategy, while an adaptive environment (follower) selects challenging supervised alternatives in response. To explicitly address label efficiency, we incorporate a finite supervision […]

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arXiv:2506.15492v2 Announce Type: replace-cross Abstract: Some of the simplest, yet most frequently used predictors in statistics and machine learning use weighted linear combinations of features. Such linear predictors can model non-linear relationships between features by adding interaction terms corresponding to the products of all pairs of features. We consider the problem of accurately estimating coefficients for interaction terms in linear predictors. We hypothesize that the coefficients for different interaction terms have an approximate low-dimensional structure and represent each […]

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