Jiayou(Rick) Liang

Jiayou(Rick) Liang

The University of Chicago

Publications

Journal Articles

Validating Two Pathological Foundation Models for Breast Biomarker Detection

Published in In preparation, 2025

First study transferring Direct Preference Optimization (DPO) from LLM alignment to computational pathology. A label-free preference-pair pipeline (UMAP + DBSCAN on TITAN embeddings) plus LoRA-DPO fine-tuning lifts PR-status AUROC from 79.75% to 81.92% and Cohen’s κ from 45.40% to 54.43%. In preparation.

Recommended citation: Atiya, S., Liang, J., et al. (2025). "Validating Two Pathological Foundation Models for Breast Biomarker Detection." In preparation.

Faster Adaptive Optimization via Expected Gradient Outer Product Reparameterization

Published in SIAM Journal on Mathematics of Data Science (under review), 2025

Tightens Adagrad/Adam convergence bounds by a factor of 1/d via EGOP-based reparameterization, and proposes Auxiliary-Variable and Reduced EGOP algorithms that bypass the storage/compute bottleneck of full-matrix preconditioning. Submitted to SIMODS.

Recommended citation: DePavia, A., Cruzado, J., Liang, J., Charisopoulos, V., & Willett, R. (2025). "Faster Adaptive Optimization via Expected Gradient Outer Product Reparameterization." Submitted to SIAM Journal on Mathematics of Data Science (SIMODS).
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Analyst Reports and Stock Performance: Evidence from the Chinese Market

Published in Asia-Pacific Financial Markets, 2025

Used a fine-tuned BERT sentiment classifier on Chinese sell-side analyst reports to test whether textual tone predicts cross-sectional returns in the A-share market. Accepted at Asia-Pacific Financial Markets.

Recommended citation: Liu, R., Liang, J., Chen, H., & Hu, Y. (2025). "Analyst Reports and Stock Performance: Evidence from the Chinese Market." Asia-Pacific Financial Markets.
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