Function: log(mean(gradient[1](divide(numbers("per") if numbers('epe') > numbers("xyx") else numbers("xxy"), numbers("per"))), divide(numbers('epe') if numbers("xyx") > numbers("per") else numbers("xxy"), numbers("per"))), gradient[1](divide(numbers("per") if numbers('epe') > numbers("xyx") else numbers("xxy"), numbers("per"))))
