improve accuracy of 3x3 direct eigenvector extraction
improve accuracy of 3x3 direct eigenvector extraction

toastedcrumpets/eigen,Zefz/eigen,Zefz/eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen,toastedcrumpets/eigen,pasuka/eigen,ritsu1228/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,toastedcrumpets/eigen,TSC21/Eigen,Zefz/eigen,pasuka/eigen,TSC21/Eigen,TSC21/Eigen,ritsu1228/eigen,pasuka/eigen,ritsu1228/eigen,pasuka/eigen,ritsu1228/eigen,toastedcrumpets/eigen