I graduated from Department of Automation, Tsinghua University with a bachelor degree of Engineering. Previously, I was a short-term research scholar in Robotics Institute, Carnegie Mellon University, advised by Prof. Kris Kitani, from Sept. 2018 to Feb. 2019. Before that, I worked in UIUC as a summer intern in 2017, advised by Prof. Jian Peng. In Tsinghua University, I have ever worked with Prof. Xuegong Zhang since May 2017 and Prof. Feng Chen in 2016 as a research assistant.
My research interest lies at the intersection of machine learning and chemistry/computer vision/language. I'm particularly interested in generative models, graph neural networks and reinforcement learning.
1. Jiaqi Guan, Ye Yuan, Kris M. Kitani, Nicholas Rhinehart. Generative Hybrid Representations for Activity Forecasting with No-Regret Learning. CVPR 2020. [pdf]
2. Jiaqi Guan, Yang Liu, Qiang Liu, Jian Peng. Energy-efficient Amortized Inference with Cascaded Deep Classifiers. The 27th International Joint Conference on Artificial Intelligence (IJCAI 2018) [pdf] [poster] [slides]
3. Jiaqi Guan, Runzhe Li, Sheng Yu, Xuegong Zhang. Generation of Synthetic Electronic Medical Record Text. 2018 IEEE International Conference on Bioinformatics and Biomedicine (BIBM 2018) [pdf] [slides]
4. Jiaqi Guan, Runzhe Li, Sheng Yu, Xuegong Zhang. A Method for Generating Synthetic Electronic Medical Record Text. IEEE/ACM transactions on computational biology and bioinformatics (TCBB) [pdf]
First-person Activity Forecasting [pdf]
Jiaqi Guan, Ye Yuan, Kris Kitani, Nick Rhinehart
We develop an efficient model that can properly represent the joint space of discrete and continuous behaviors in order to predict a person's future behaviors. We learn a deep generative model across discrete actions and continuous positions by leveraging recent advances in discrete generative modeling and continuous conditional generative modeling. We evaluate our method on a large-scale egocentric dataset, EPIC-KITCHENS, demonstrate the effectiveness of joint trajectory-action forecasting, and observe our method exhibits performance superior to that of related generative models.
Energy-efficient Amortized Inference with Cascaded Deep Classifiers [pdf]
Deep neural networks have been remarkable successful in various AI tasks but often cast high computation and energy cost. We address this problem by proposing a novel framework that optimizes the prediction accuracy and energy cost simultaneously. In our framework, each data instance is pushed into a cascade of deep neural networks with increasing sizes, and a selection module is used to sequentially determine when a sufficiently accurate classifier can be used for this data instance. The cascade of neural networks and the selection module are jointly trained in an end-to-end fashion by the REINFORCE algorithm to optimize a trade-off between the computational cost and the predictive accuracy.
Generation of Synthetic Electronic Medical Record Text [pdf]
Jiaqi Guan, Runzhe Li, Sheng Yu, Xuegong Zhang
Free EMR texts are lacking consistent standards, rich of private information, and limited in availability, which hinders the development of ML and NLP methods for EMR data analysis. To tackle these problems, we developed a model to generate synthetic text of EMRs called Medical Text Generative Adversarial Network. It takes disease features as inputs and generates synthetic texts as EMRs for the corresponding diseases. We evaluate the model from micro-level, macro-level and application- level on a Chinese EMR text dataset. The results show that the method has a good capacity to fit real data and can generate realistic and diverse EMR samples.
Accurate People Detection
Jiaqi Guan, Feng Chen
People detection has many practical uses, such as detecting whether there are suspicious people around fences, people counting and so on. We first applied some famous visual detection frameworks such as Faster-RCNN, YOLO, but the performance was not satisfactory. Finally, we reproduced feature pyramid network based on Caffe that had a better performance on small object detection. We also made a simple people counting mobile app to test the algorithm.
- 2018 Excellent Graduate of Department of Automation (25 of 150+)
- 2017 Honorable Mention, Mathematical Contest in Modeling (MCM), COMAP
- 2016 Tsinghua Alumni Scholarship (For excellent academic performance, top 10%)
- 2015 Tsinghua Alumni Scholarship (For excellent academic performance, top 10%)
- 2015 Tsinghua Scholarship (For excellent performance in social activities)
- 2015 Tsinghua University Outstanding Student Leader
Programming Languages: Python, Matlab, C/C++, C#
Framework & Tools: PyTorch, Tensorflow, Caffe, Git, ROS, OpenCV