CDAE: Enhancing Perturbation Robustness in Pretrained Language Models with Contrastive Denoising
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Computer Science > Artificial Intelligence
arXiv:2607.28236 (cs)
[Submitted on 30 Jul 2026]
Title:CDAE: Enhancing Perturbation Robustness in Pretrained Language Models with Contrastive Denoising
View a PDF of the paper titled CDAE: Enhancing Perturbation Robustness in Pretrained Language Models with Contrastive Denoising, by Sina Heydari and 3 other authors
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Abstract:Pre-trained language models have significantly improved sentence representation learning, yet their embedding remain sensitive to semantic preserving textual perturbations such as synonym substitution, masking and word dropout. This work proposes a lightweight Contrastive Denoising Autoencoder (CDAE) that refines pre-trained BERT embedding by jointly optimizing contrastive and reconstruction objective to learn perturbation-invariant representation. We evaluate the proposed framework using multiple perturbation strategies with varying strengths and compare it against the original BERT embeddings and SimCSE. Experimental results show that CDAE consistently preserves higher embedding similarity under perturbations, with the improvements becoming more pronounced as framework effectively enhances representation stability while preserving semantic information, highlighting perturbation-invariant learning as a promising direction for improving sentence embeddings. The source code is publicly available at: this https URL
| Comments: | Submitted to 16th International Conference on Computer and Knowledge Engineering (ICCKE 2026) |
| Subjects: | Artificial Intelligence (cs.AI); Computation and Language (cs.CL) |
| ACM classes: | I.2.4; I.2.6 |
| Cite as: | arXiv:2607.28236 [cs.AI] |
| (or arXiv:2607.28236v1 [cs.AI] for this version) | |
| https://doi.org/10.48550/arXiv.2607.28236
arXiv-issued DOI via DataCite (pending registration)
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View a PDF of the paper titled CDAE: Enhancing Perturbation Robustness in Pretrained Language Models with Contrastive Denoising, by Sina Heydari and 3 other authors
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