4 papers
GoAnt: Quality-Diversity Multi-Agent Search for Alpha Factor Discovery in Market Microstructure Data
Stella Zhao, Tommy Sha
Automated alpha factor discovery searches symbolic trading signals from price-volume panels and order-book data under a fixed evaluation budget. Existing single- and multi-agent pr…
ThinkPrior: Zero-Rollout Difficulty Priors for Cold-Start Prompt Selection in RLVR
Tommy Sha, Skylar Zhai, Siqi Zhao
In reinforcement learning with verifiable rewards (RLVR) trained with group relative policy optimization (GRPO), the KL-free reward-advantage term studied here depends on within-gr…
BenchScope: How Many Independent Signals Does Your Benchmark Provide?
Tommy Sha, Stella Zhao
AI evaluation suites often report many scores without checking whether those scores carry independent information. We introduce Effective Dimensionality (ED), the participation rat…
FAST-CAD: A Fairness-Aware Framework for Non-Contact Stroke Diagnosis
Tommy Sha, Zhan Cheng, Haotian Zhai +9
Stroke is an acute cerebrovascular disease, and timely diagnosis significantly improves patient survival. However, existing automated diagnosis methods suffer from fairness issues…