Zhen Wang / 王震

Hi! I am a PhD candidate at the Department of Computer Science and Engineering of The Ohio State University, working on natural language processing, machine learning, and data mining, advised by Prof. Huan Sun.

In summer 2022, I interned at MIT-IBM Watson AI Lab working with Rameswar, Yoon, Leonid, and Rogerio on efficient adaptation of large language models. In summer 2021, I was a research intern at the NLP group in Microsoft Research, Redmond, working with Nebojsa and Kolya from Mila, studying coherence boosting and prompting calibration on GPT-3. In summer 2020, I was a research intern at the data science team in NEC Laboratories, America working with Bo Zong, exploring commonsense knowledge representation and reasoning.

Email  /  CV (July, 2022)  /  GitHub  /  Twitter  /  Google Scholar  /  LinkedIn

Research

I am interested in empowering current AI systems with more explicit and human-understandable knowledge, aiming to make them more generalizable, interpretable and data efficient. My research lies in the nexus of natural language processing, deep learning, data mining, and studies the "full stack" of the knowledge-centric AI from ground up: acquisition, representation and reasoning. My long-term research goal is to transfuse strengths of human learning capabilities (e.g., intuitive physics, commonsense reasoning) to the next evolution of AI systems.

• Knowledge Acquisition: Structured knowledge extraction from text and graphs, Knowledge Graph construction, Knowledge distillation from language models
• Knowledge Representation: Word representation learning, Graph embedding learning, Graph neural networks, Commonsense concept learning
• Knowledge Reasoning: Multi-hop reasoning over text and graphs (KG reasoning, complex QA reasoning), Neuro-symbolic reasoning, Commonsense reasoning
• Applications: Natural language interfaces (dialogue systems, question answering), Controllable text generation, Text summarization, Zero-/few-shot language model prompting, Knowledge discovery for healthcare/bioinformatics

Free feel to reach out if you’d like to have a chat 🤗

News

Publications

Preprint

2022

Coherence Boosting: When Your Pretrained Language Model is Not Paying Enough Attention

We demonstrate that large language models have insufficiently learned the effect of distant words on next-token prediction. We present Coherence Boosting, an inference procedure that increases a LM’s focus on a long context, which gets huge improvement on NLG and NLU tasks.

Knowledge Transfer between Structured and Unstructured Sources for Complex Question Answering

We study knowledge transfer for multi-hop reasoning processes between structured (Knowledge Base) and unstructred (text corpus) knowledge. We design SimultQA unifying KBQA and TextQA systems and leverage it to study how the reasoning is transferred between two knowledge sources.

2021

Bootstrapping a User-Centered Task-Oriented Dialogue System

We build TacoBot, a task-oriented dialogue system for the inaugural Alexa Prize TaskBot Challenge to assist users in multi-step cooking and home improvement tasks. We propose several data augmentation methods, such as GPT-3 simulation to bootstrap neural dialogue systems into new domains and make them more robust to noise user initiatives.

Modeling Context Pair Interaction for Pairwise Tasks on Graphs

We propose to explicitly model context interactions for pairwise prediction tasks on graphs, which consists of two perspectives, node-centric and pair-centric. We also propose to pre-train pair embeddings to facilitate the pair-centric model.

2020

Rationalizing Medical Relation Prediction from Corpus-level Statistics

We propose a self-interpretable framework to rationalize the neural relation prediction based on corpus-level statistics. This framework is inspired by human cognitive theory about recall and recognition, which provides structured knowledge triplets as rationales.

Graph Embedding on Biomedical Networks: Methods, Applications, and Evaluations

We benchmark 11 representative graph embedding methods on 5 important biomedical tasks. We verify the effectivenes of recent graph embedding methods and provide general guidelines for their usage.

2019

SurfCon: Synonym Discovery on Privacy-Aware Clinical Data

We propose to discover structured knowledge, synonyms from privacy-aware text corpus and present a novel framework to leverage both surface form and context information to discover out-of-distribution synonyms.

Before 2019

A Comprehensive Study of StaQC for Deep Code Summarization

We examine three popular datasets mined from Stack Overflow on the code summarization task and show that StaQC (Stack Overflow Question-Code pairs) helps achieve substantially better results.

Hessian Regularized Sparse Coding for Human Action Recognition

@inproceedings{liu2015hessian,
                  title={Hessian regularized sparse coding for human action recognition},
                  author={Liu, Weifeng and Wang, Zhen and Tao, Dapeng and Yu, Jun},
                  booktitle={International Conference on Multimedia Modeling},
                  pages={502--511},
                  year={2015},
                  organization={Springer}
                  }
                  

We propose Hessian regularized sparse coding (HessianSC) for action recognition, which can well preserve the local geometry and steer the sparse coding varying linearly along the manifold of data distribution.

Honors and Awards

• Third-Place Honor, Inaugural Alexa Prize TaskBot Challenge, 2022
• Graduate Research Award, CSE, OSU, 2022
• Graduate Student Research Poster Award (Top 5), CSE, OSU, 2021
• SIGIR Student Travel Grant, 2021
• Rising Stars in Data Science, Center for Data and Computing (CDAC), University of Chicago, January 2021
• SIGKDD Student Travel Award, 2019
• China Scholarship Council (CSC) Scholarship for a fully funded visiting program in Polytech Nice Sophia, Nice, France, 2015
• National Scholarship, China, 2014
• Soong Ching Ling Foundation (SCLF) Scholarship, China, 2013
• National Scholarship for Encouragement, China, 2012

Services

Program Committee Member:
• ACL ARR (Oct'21, Nov'21, Jan'22, Apr'22)
• SUKI 2022 Workshop at NAACL 2022
• EMNLP 2021, 2022
• ACL 2021
• AAAI 2023
• NAACL 2021
• NLPCC (2020, 2021, 2022)
External Reviewer:
• KDD (2019, 2020), ACL 2018, ICDM 2018

Source code from Leonid Keselman, design and inspiration from Jon Barron and Dongkuan.