ESC
Zhichao (Chris) Hou

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Zhichao (Chris) Hou

PhD in Computer Science

North Carolina State University

  • (2027) Ph.D. Computer Science, NCSU
  • (2023) M.S. Mathematics, CAS
  • (2020) B.S. Mathematics, BNU

About Me

I am currently a Ph.D. student in Computer Science at North Carolina State University, where I am fortunate to be advised by Prof. Xiaorui Liu. Prior to that, I received my M.S. degree in Mathematics from the Chinese Academy of Sciences, and my B.S. degree in Mathematics from Beijing Normal University. I have gained diverse industry research experience at Trustworthy Shopping at Amazon (2026), Automated Reasoning at AWS AI (2025), Amazon GuardDuty (2024), Baidu, Inc. (2023), and Tsinghua AIR (2022).

My research focuses on building scalable trustworthy AI systems that stay reliable across dynamic environments while remaining efficient to train, deploy, and store, which can be divided into three pieces:

  1. ▶ Architecture Level β€” Robustness-Informed Neural Networks (RINNs) Framework

    Grounded in the theoretical foundations of robust statistics and non-convex optimization, I propose robustness-informed neural networks (RINNs), a principled framework applicable across diverse architectures and domains. I instantiate RINNs for transformers via robust attention [ProTransformer, NeurIPS'24], for graph neural networks via unbiased robust aggregation [RUNG, NeurIPS'24], and for convolutional networks via robust dictionary structure [EDLNets].

  2. ▶ Deployment Level β€” Training Acceleration · Resource Limit · Dynamic Risk

    Real-world deployment is constrained by limited training budgets, heterogeneous compute, and ever-changing environments, raising three practical questions I pursue:

    1. How to accelerate robust training? I cut the cost of robust training by removing redundancy across iterative attack/defense steps, matching standard adversarial training's robustness with only 30% of the training budget [Spiking Attacks, ICLR'26].
    2. How to robustify models with limited resource? I enable resource-adaptive robustification of pretrained models through training-free integration [ProTransformer, NeurIPS'24] and versatile robustness reprogramming across paradigms spanning training-free adaptation to full fine-tuning [Robustness Reprogramming, ICLR'25].
    3. How can a single model handle dynamic environments? I train one all-in-one model conditioned on risk type, so new risks are met with a lightweight adapter rather than retraining the backbone [CAN].
  3. ▶ Computing Level β€” Algorithmic Acceleration · Kernel Efficiency · Precision Reduction

    I systematically cut computational overhead across all three levels:

    1. Algorithm-wise: I eliminate redundant operations across iterative trustworthy-AI procedures, accelerating iterative attacks and adversarial training [Spiking Attacks, ICLR'26], randomized smoothing [SRS, NeurIPS'24], and memory-enhanced graph learning [IncAgg-GNN, NeurIPS'26].
    2. Kernel-wise: I design hardware-aware GPU kernels that minimize memory traffic, fusing robust reweighting into IO-aware attention kernels to safeguard LLM agents in real time [ProFlashAttention].
    3. Precision-wise: I compute with fewer bits by quantizing the small, stabilizing updates in iterative procedures rather than full activations, as in accelerated generative modeling [ModDiff, ICML'25], extending to quantized iterative attacks and adversarial training.

News

September, 2026 One paper on Scalable Graph Model is accepted by NeurIPS 2026.
June, 2026 Our paper on Robustness in Directed Graphs is accepted by ACM Transactions on Knowledge Discovery from Data (TKDD).
May, 2026 The Neurosymbolic LLM Reasoning proposal I led was honored with an Amazon Research Award.
May, 2026 I join Trustworthy Shopping AI Team at Amazon as an Applied Scientist intern at Seattle.
January, 2026 Our papers on Scalable Attack and Molecular Generation are accepted by ICLR 2026. See you in Rio de Janeiro!
May, 2025 I join Automated Reasoning Group at AWS AI as an Applied Scientist intern at New York.
May, 2025 Our paper "Modulated Diffusion" is accepted by ICML 2025. See you in Vancouver!
March, 2025 Our paper on "Scientific Discovery in Bioinformatics" is accepted by ICLR 2025 Workshop XAI4Science.
February, 2025 Our paper on Robustness Reprogramming is selected as a Spotlight paper (1.4% ≈ 162/11670) by ICLR 2025.
January, 2025 Our paper on Robustness Reprogramming is accepted by ICLR 2025. See you in Singapore!
October, 2024 I give a tutorial at DSAA about "Adversarial Robustness in Graph Neural Networks".
September, 2024 Our papers on Robust Transformers, Robust GNNs, and Efficient Certifiable Robustness are accepted by NeurIPS 2024. See you in Vancouver!
July, 2024 I receive the National AI Research Resource Pilot Award for our research on exploring and enhancing the robustness of LLMs and foundation models.
May, 2024 I join Amazon AWS GuardDuty as an Applied Scientist intern at New York.
May, 2024 Our tutorial on "Adversarial Robustness in Graph Neural Networks" is accepted by DSAA 2024. See you in San Diego!
May, 2024 I receive the Summer Graduate Merit Awards.
March, 2024 Our paper on Robust Transformers is accepted by ICLR 2024 Workshop on Reliable and Responsible Foundation Models.
February, 2024 Our paper on Single-Cell ATAC-seq Analysis is accepted by Briefings in Bioinformatics.
September, 2023 Our paper on Physical Dynamics is accepted by NeurIPS 2023. See you in New Orleans!
September, 2023 One paper on Explainable Survival Analysis is accepted by BMC Bioinformatics.
June, 2023 I join Big Search team in Baidu, Inc. as a research intern at Beijing.
March, 2022 I join Institute for AI Industry Research, Tsinghua University as a research intern.

Selected Publications

Full Publications →
ICLR 2025 🏆 SPOTLIGHT Paper ↗GitHub ↗Website ↗Poster ↗

Robustness Reprogramming for Representation Learning

Zhichao Hou, MohamadAli Torkamani, Hamid Krim, Xiaorui Liu

Top 1.4% of 11,670 submissions · International Conference on Learning Representations (ICLR)

Fine-Grained Iterative Adversarial Attacks with Limited Computation Budget

Zhichao Hou, Weizhi Gao, Xiaorui Liu

International Conference on Learning Representations (ICLR)

ProTransformer: Robustify Transformers via Plug-and-Play Paradigm

Zhichao Hou, Weizhi Gao, Yuchen Shen, Feiyi Wang, Xiaorui Liu

Neural Information Processing Systems (NeurIPS)

Robust Graph Neural Networks via Unbiased Aggregation

Zhichao Hou, Ruiqi Feng, Tyler Derr, Xiaorui Liu

Neural Information Processing Systems (NeurIPS)

NeurIPS 2023 Paper ↗GitHub ↗

Equivariant Spatio-Temporal Attentive Graph Networks to Simulate Physical Dynamics

Liming Wu*, Zhichao Hou*, Jirui Yuan, Yu Rong, Wenbing Huang

Neural Information Processing Systems (NeurIPS) · * denotes equal contribution

Preprint Paper ↗

Boosting Adversarial Robustness and Generalization with Dictionary Structure

Zhichao Hou, Weizhi Gao, Hamid Krim, Runze Li, Xiaorui Liu

Preprint

Preprint Paper ↗

Towards One-for-All Robustness Across a Continuum of Threat Levels

Zhichao Hou, Xiaorui Liu

Preprint


Internship Experience

May 2026 — Aug 2026

Applied Scientist Intern

Amazon Web Services

Trustworthy Shopping AI Team SEATTLE, WA

Collaborators: Rui Song, Lingdao Shao, Xueyu Mao, Yang Liu, Peijie Qiu

Building token- and context-efficient LLM systems for modeling behavioral and structured data. → TEFM ↗, CEMBS (pending for final approval).

May 2025 — Aug 2025

Applied Scientist Intern

Amazon Web Services

Automated Reasoning at AWS AI NEW YORK, NY

Collaborators: Ferhat Erata, MohamadAli Torkamani

Improving natural language to logical formula translation and reasoning fidelity for LLM-based automated reasoning. → Amazon Research Award ↗, SCD ↗.

May 2024 — Aug 2024

Applied Scientist Intern

Amazon Web Services

Security Analytics and AI Research (SAAR) NEW YORK, NY

Collaborator: MohamadAli Torkamani

Designing efficient hierarchical transformer architectures for representing and analyzing large-scale log data. → HLogformer ↗.

May 2023 — Aug 2023

Research Intern

Baidu, Inc.

Big Search Group BEIJING, CHINA

Collaborators: Xiaochi Wei, Dawei Yin

Mar 2022 — Sep 2022

Research Intern

Tsinghua University

Institute for AI Industry Research BEIJING, CHINA

Collaborators: Wenbing Huang, Yu Rong

Developing equivariant spatio-temporal graph neural networks to simulate physical dynamics. → ESTAG [NeurIPS 2023] ↗.


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