A Learnable Multi-views Contrastive Framework with Reconstruction Discrepancy for Medical Time-Series
This work addresses medical time-series diagnosis for healthcare applications, but it appears incremental as it builds on existing contrastive learning and AE-GAN methods.
The paper tackles the challenges of high annotation costs and lack of generalizability in medical time-series disease diagnosis by proposing a learnable multi-views contrastive framework with reconstruction discrepancy, which consistently outperforms seven baselines on datasets for myocardial infarction, Alzheimer's disease, and Parkinson's disease.
In medical time series disease diagnosis, two key challenges are identified.First, the high annotation cost of medical data leads to overfitting in models trained on label-limited, single-center datasets. To address this, we propose incorporating external data from related tasks and leveraging AE-GAN to extract prior knowledge,providing valuable references for downstream tasks. Second, many existing studies employ contrastive learning to derive more generalized medical sequence representations for diagnostic tasks, usually relying on manually designed diverse positive and negative sample pairs.However, these approaches are complex, lack generalizability, and fail to adaptively capture disease-specific features across different conditions.To overcome this, we introduce LMCF (Learnable Multi-views Contrastive Framework), a framework that integrates a multi-head attention mechanism and adaptively learns representations from different views through inter-view and intra-view contrastive learning strategies.Additionally, the pre-trained AE-GAN is used to reconstruct discrepancies in the target data as disease probabilities, which are then integrated into the contrastive learning process.Experiments on three target datasets demonstrate that our method consistently outperforms seven other baselines, highlighting its significant impact on healthcare applications such as the diagnosis of myocardial infarction, Alzheimer's disease, and Parkinson's disease.