mlr_measures_regr.smape {mlr3}

Symmetric Mean Absolute Percent Error

Description

Measure to compare true observed response with predicted response in regression tasks.

Details

The Symmetric Mean Absolute Percent Error is defined as

\frac{2}{n} \sum_{i=1}^n \frac{\left| t_i - r_i \right|}{\left| t_i \right| + \left| r_i \right|}.

This measure is undefined if if any |t| + |r| is 0.

Dictionary

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

mlr_measures$get("regr.smape")
msr("regr.smape")

Parameters

Empty ParamSet

Meta Information

• Type: "regr"

• Range: [0, 2]

• Minimize: TRUE

• Required prediction: response

Note

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

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

See Also

Dictionary of Measures: mlr_measures

as.data.table(mlr_measures) for a complete table of all (also dynamically created) Measure implementations.

Other regression measures: mlr_measures_regr.bias, mlr_measures_regr.ktau, mlr_measures_regr.mae, mlr_measures_regr.mape, mlr_measures_regr.maxae, mlr_measures_regr.medae, mlr_measures_regr.medse, mlr_measures_regr.mse, mlr_measures_regr.msle, mlr_measures_regr.pbias, mlr_measures_regr.rae, mlr_measures_regr.rmse, mlr_measures_regr.rmsle, mlr_measures_regr.rrse, mlr_measures_regr.rse, mlr_measures_regr.rsq, mlr_measures_regr.sae, mlr_measures_regr.srho, mlr_measures_regr.sse