ECRTime: Ensemble Integration of Classification and Retrieval for Time Series Classification
This addresses a specific bottleneck in time series classification for researchers and practitioners, offering an incremental improvement over existing deep learning methods.
The paper tackles the problem of inter-class similarity and intra-class inconsistency in time series classification by introducing ECR, which integrates deep learning-based retrieval with classification, achieving state-of-the-art results on 112 UCR datasets and surpassing InceptionTime in accuracy with reduced training time.
Deep learning-based methods for Time Series Classification (TSC) typically utilize deep networks to extract features, which are then processed through a combination of a Fully Connected (FC) layer and a SoftMax function. However, we have observed the phenomenon of inter-class similarity and intra-class inconsistency in the datasets from the UCR archive and further analyzed how this phenomenon adversely affects the "FC+SoftMax" paradigm. To address the issue, we introduce ECR, which, for the first time to our knowledge, applies deep learning-based retrieval algorithm to the TSC problem and integrates classification and retrieval models. Experimental results on 112 UCR datasets demonstrate that ECR is state-of-the-art(sota) compared to existing deep learning-based methods. Furthermore, we have developed a more precise classifier, ECRTime, which is an ensemble of ECR. ECRTime surpasses the currently most accurate deep learning classifier, InceptionTime, in terms of accuracy, achieving this with reduced training time and comparable scalability.