break_down function

Model Agnostic Sequential Variable Attributions

This function finds Variable Attributions via Sequential Variable Conditioning. It calls either local_attributions for additive attributions or local_interactions for attributions with interactions.

break_down(x, ..., interactions = FALSE)

## S3 method for class 'explainer'
break_down(x, new_observation, ..., interactions = FALSE)

## Default S3 method:
break_down(
  x,
  data,
  predict_function = predict,
  new_observation,
  keep_distributions = FALSE,
  order = NULL,
  label = class(x)[1],
  ...,
  interactions = FALSE
)

Arguments

• x: an explainer created with function explain or a model.
• ...: parameters passed to local_* functions.
• interactions: shall interactions be included?
• new_observation: a new observation with columns that correspond to variables used in the model.
• data: validation dataset, will be extracted from x if it is an explainer.
• predict_function: predict function, will be extracted from x if it's an explainer.
• keep_distributions: if TRUE, then distribution of partial predictions is stored and can be plotted with the generic plot().
• order: if not NULL, then it will be a fixed order of variables. It can be a numeric vector or vector with names of variables.
• label: name of the model. By default it is extracted from the 'class' attribute of the model.

Returns

an object of the break_down class.

Examples

library("DALEX")
library("iBreakDown")
set.seed(1313)
model_titanic_glm <- glm(survived ~ gender + age + fare,
                       data = titanic_imputed, family = "binomial")
explain_titanic_glm <- explain(model_titanic_glm,
                           data = titanic_imputed,
                           y = titanic_imputed$survived,
                           label = "glm")

bd_glm <- break_down(explain_titanic_glm, titanic_imputed[1, ])
bd_glm
plot(bd_glm, max_features = 3)

## Not run:

## Not run:
library("randomForest")
set.seed(1313)
# example with interaction
# classification for HR data
model <- randomForest(status ~ . , data = HR)
new_observation <- HR_test[1,]

explainer_rf <- explain(model,
                        data = HR[1:1000,1:5])

bd_rf <- break_down(explainer_rf,
                           new_observation)
head(bd_rf)
plot(bd_rf)
## End(Not run)

References

Explanatory Model Analysis. Explore, Explain and Examine Predictive Models. https://ema.drwhy.ai

See Also

local_attributions, local_interactions