pytorch

539d3ff3 - Revert D20749588: [pytorch][PR] Use `std::abs` instead of `abs` in lbfgs.cpp

Revert D20749588: [pytorch][PR] Use `std::abs` instead of `abs` in lbfgs.cpp Test Plan: revert-hammer Differential Revision: D20749588 Original commit changeset: b6640af67587 fbshipit-source-id: 730ff95e19d2f222aa11d092fa53f661f3f0d367