In most realistic domains, the variables transit between its possible states over time. The data is generated by the dynamic processes with multiple observations at different time points. Dynamic models are needed for modeling such transition intensities over time.

In this project, we consider the problem of incorporating the domain knowledge on different weights of positive samples and negative samples. One of the motivations is the class-imbalance situation in many relational domains where the classifier boundary could be easily dominated by the majority class and overfitting on its outliers. Hence, it is essential to steer the training process toward focusing more on the minority class by assigning different costs on false positive and false negative samples. Besides the requirement enforced by such data properties, there are also practical demands in certain domains, such as the diagnosis problem in medical domains, the quality checking in manufacturing data, the recommendation prediction in recommender systems, etc.

Knowledge-intensive Learning

In many domains where there are considerable amount of factors influencing the target variable, the dimension of the parameter space for probabilistic models is exponential in the number of variables, which would require significant amount of training samples to guarantee a reasonable prediction accuracy. For this project, we proposed a way to incorporate the domain knowledge on the independence of causal influence and qualitative constraints which greatly improves the prediction performance by reducing the dimension of feature space as well as constraining the searching space.

Recent Publications

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reviewer for Journal Knowledge-Based Systems 1
reviewer for Journal Data Mining and Knowledge Discovery
reviewer for Journal of Artificial Intelligence Research
PC member of ICLR 2020
PC member of IJCAI 2020, 2019, 2018
PC member of AAAI 2020
PC member of SDM 2020
reviewer for NIPS 2016
subreviewer for LOD 2018, AAAI 2016, AISTATS 2016, UAI 2015, ICDM 2015, KDD 2014

  1. reviewer with outstanding contribution awarded by Knowledge-Based Systems, 2018. Certificate ^