Regression measure defined as $$\frac{1}{n} \sum_{i=1}^n w_i \left| \frac{ t_i - r_i}{t_i} \right|.$$

## Details

This measure is undefined if any element of $$t$$ is $$0$$.

## Note

The score function calls mlr3measures::mape() from package mlr3measures.

If the measure is undefined for the input, NaN is returned. This can be customized by setting the field na_value.

## Dictionary

This Measure can be instantiated via the dictionary mlr_measures or with the associated sugar function msr():

mlr_measures\$get("regr.mape")
msr("regr.mape")

Empty ParamSet

## Meta Information

• Type: "regr"

• Range: $$[0, \infty)$$

• Minimize: TRUE

• Required prediction: response