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Interpreting CLIP's Image Representation via Text-Based Decomposition

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arxiv 2310.05916 v4 pith:ZF243VS5 submitted 2023-10-09 cs.CV cs.AI

Interpreting CLIP's Image Representation via Text-Based Decomposition

classification cs.CV cs.AI
keywords imagecliprepresentationheadsinterpretingattentionindividualmodel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the CLIP image encoder by analyzing how individual model components affect the final representation. We decompose the image representation as a sum across individual image patches, model layers, and attention heads, and use CLIP's text representation to interpret the summands. Interpreting the attention heads, we characterize each head's role by automatically finding text representations that span its output space, which reveals property-specific roles for many heads (e.g. location or shape). Next, interpreting the image patches, we uncover an emergent spatial localization within CLIP. Finally, we use this understanding to remove spurious features from CLIP and to create a strong zero-shot image segmenter. Our results indicate that a scalable understanding of transformer models is attainable and can be used to repair and improve models.

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Cited by 11 Pith papers

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