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Learning Transferable Visual Models From Natural Language Supervision

ICML 2021 · Vision-language and multimodal › CLIP and zero-shot · approach: Open-vocabulary alignment from VLMs · 5,285 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Train on image-text pairs with a contrastive matching objective instead of the Visual N-Grams approachCLIP · ImageNet zero-shotaccuracy: 11.5 -> 76.2Helped
Use the prompt “A photo of a {label}.” instead of contextless class names (ablation)CLIP zero-shot classifier · ImageNetaccuracy: +1.3%Helped
Ensemble 80 context prompts instead of using the single default prompt (ablation)CLIP zero-shot classifier · ImageNetaccuracy: +3.5%Helped
Combine prompt engineering and prompt ensembling instead of embedding class names without context (ablation)CLIP zero-shot classifier · 36 datasetsaverage accuracy: almost 5 pointsHelped
Replace caption language modeling with bag-of-words text prediction (ablation)CLIP image-caption baseline · ImageNet zero-shot transfer efficiencytransfer learning efficiency: 3xHelped
Replace predictive bag-of-words objective with contrastive image-text matching (ablation)CLIP · ImageNet zero-shot transfer efficiencytransfer learning efficiency: 4xHelped
Adapt the zero-shot CLIP classifier to ImageNet using supervised training (ablation)CLIP · ImageNetaccuracy: 9.2% to 85.4%Helped
Adapt the zero-shot CLIP classifier to ImageNet using supervised training (ablation)CLIP · Seven natural distribution-shift datasetsaverage accuracyHurt
Use dataset-specific zero-shot class names instead of an ImageNet classifier with pooled class mappings (ablation)CLIP · Seven natural distribution-shift datasetseffective robustness: 5%Helped
Increase the number of ImageNet examples used to fit a classifier on CLIP features (ablation)CLIP few-shot classifier · Natural distribution shiftseffective robustnessHurt
Use ViT image encoders instead of CLIP ResNet image encoders (ablation)CLIP · Linear-probe evaluationcompute efficiency: 3xHelped
Increase CLIP model compute (ablation)CLIP · 39 evaluations across 36 datasetszero-shot error: 44x range of computeHelped

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