Re-Weighting Cross-Modal Pairs via Rank Consistency for Noise-Robust Retrieval

摘要

Image-text alignment relies on large-scale, well-aligned image-text pairs, yet web-crawled datasets inevitably introduce noisy correspondence. Existing methods typically re-weight training pairs by estimating semantic matching degrees from the model's own similarity predictions, which are inherently unreliable under noise and often overestimate partially aligned pairs. To overcome this limitation, we introduce a novel semantic matching degree estimation method based on ranking consistency. Our basic idea is that for a well-aligned image-text pair (I, T), the image I and text T should occupy semantically consistent positions in the embedding space. Thus, using I and T as queries to retrieve other texts (images) should yield two highly consistent rankings. Therefore, we reweight the training paris by measuring the Normalized Discounted Cumulative Gain (NDCG) between its cross-modal and intra-modal retrieval results. This signal is derived from the global data manifold structure rather than point-wise predictions, making it more robust to noise. Experiments on multiple cross-modal retrieval benchmarks validate the effectiveness of our method. Code is available at https://github.com/Aliinton/RCR.