Axiomatic Explanations for Visual Search, Retrieval, and Similarity Learning
Name
Hamilton-markth-SM-EECS-2022-thesis.pdf
Description
Thesis PDF
Size
5.88 MB
Format
Adobe PDF
Checksum (MD5)
aba4c93090ae2333acaa2789f03308dc
Author(s)
Hamilton, Mark
Advisor(s)
Freeman, William T.
Date Issued
May 2022
Publisher
Massachusetts Institute of Technology
Abstract
Visual search, recommendation, and contrastive similarity learning power technologies that impact billions of users worldwide. Modern model architectures can be complex and difficult to interpret, and there are several competing techniques one can use to explain a search engine’s behavior. We show that the theory of fair credit assignment provides a unique axiomatic solution that generalizes several existing recommendation- and metric-explainability techniques in the literature. Using this formalism, we show when existing approaches violate “fairness” and derive methods that sidestep these shortcomings and naturally handle counterfactual information. More specifically, we show existing approaches implicitly approximate second-order Shapley-Taylor indices and extend CAM, GradCAM, LIME, SHAP, SBSM, and other methods to search engines. These extensions can extract pairwise correspondences between images from trained opaque-box models. We also introduce a fast kernel-based method for estimating Shapley-Taylor indices that require orders of magnitude fewer function evaluations to converge. Finally, we show that these game-theoretic measures yield more consistent explanations for image similarity architectures.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
In Copyright - Educational Use Permitted
Copyright MIT
Persistent DSpace Link
