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This paper presents an automated model and a project, Arrakis, for finding defects in shading algorithms for graphics rendering and compute workloads. A key challenge in shading algorithm testing is the lack of an oracle that can determine the quality and the output of a custom shading algorithm; this is crucial in graphics workloads because expensive assets are often wasted on solving these problems. A broad solution, Arrakis is developed, which builds on current graphics technology advancesdoi:10.1556/606.2019.14.1.4 fatcat:qcivyqdhhfc2rlimkrrvo2cazi