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David Novotny authored
Summary: Implements a backprop-safe version of `torch.acos` that linearly extrapolates the function outside bounds. Below is a plot of the extrapolated acos for different bounds: {F611339485} Reviewed By: bottler, nikhilaravi Differential Revision: D27945714 fbshipit-source-id: fa2e2385b56d6fe534338d5192447c4a3aec540cdd45123f