{"MSE": "(y - y_hat)**2", "MAE" : "Abs(y - y_hat)", "MAPE" : "100 * Abs((y - y_hat) / (y + y_hat))", "MSLE" : "(log(y + 1.) - log(y_hat + 1.))**2", "BCE" : "-(y_hat*log(y) + (1 - y_hat)*log(1 - y))", "Poisson" : "y - y_hat * log(y)"}