Search Results for author: Hangwei Qian

Found 8 papers, 5 papers with code

Unsupervised Representation Learning for Time Series: A Review

1 code implementation3 Aug 2023 Qianwen Meng, Hangwei Qian, Yong liu, Yonghui Xu, Zhiqi Shen, Lizhen Cui

However, there is a lack of systematic analysis of unsupervised representation learning approaches for time series.

Contrastive Learning Representation Learning +1

MHCCL: Masked Hierarchical Cluster-Wise Contrastive Learning for Multivariate Time Series

1 code implementation2 Dec 2022 Qianwen Meng, Hangwei Qian, Yong liu, Lizhen Cui, Yonghui Xu, Zhiqi Shen

Learning semantic-rich representations from raw unlabeled time series data is critical for downstream tasks such as classification and forecasting.

Clustering Contrastive Learning +3

DualCF: Efficient Model Extraction Attack from Counterfactual Explanations

no code implementations13 May 2022 Yongjie Wang, Hangwei Qian, Chunyan Miao

We then propose DualCF strategy to circumvent the above issues, which is achieved by taking not only CF but also counterfactual explanation of CF (CCF) as pairs of training samples for the substitute model.

counterfactual Counterfactual Explanation +1

CCLF: A Contrastive-Curiosity-Driven Learning Framework for Sample-Efficient Reinforcement Learning

1 code implementation2 May 2022 Chenyu Sun, Hangwei Qian, Chunyan Miao

As a result, the agent can focus on more informative samples and learn representation invariances more efficiently, with significantly reduced augmented inputs.

Data Augmentation Q-Learning +2

What Makes Good Contrastive Learning on Small-Scale Wearable-based Tasks?

1 code implementation12 Feb 2022 Hangwei Qian, Tian Tian, Chunyan Miao

Self-supervised learning establishes a new paradigm of learning representations with much fewer or even no label annotations.

Activity Recognition Contrastive Learning +1

From Psychological Curiosity to Artificial Curiosity: Curiosity-Driven Learning in Artificial Intelligence Tasks

no code implementations20 Jan 2022 Chenyu Sun, Hangwei Qian, Chunyan Miao

Psychological curiosity plays a significant role in human intelligence to enhance learning through exploration and information acquisition.

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