Hard negatives selected by visual confusability in sign embeddings, not linguistic similarity, substantially raise fine-grained sign-language retrieval accuracy without collapsing coarse performance.
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Semantic Hardness Is Not Visual Hardness: Sign-Aware Hard Negative Mining for Sign Language Retrieval
Hard negatives selected by visual confusability in sign embeddings, not linguistic similarity, substantially raise fine-grained sign-language retrieval accuracy without collapsing coarse performance.