plot_predictions

Sequentially vary the value of the specified features to put them into all buckets and calculate predictions for the input objects accordingly.

Alert

  • Only models trained on datasets that do not contain categorical features are supported.
  • Multiclassification modes are not supported.

Parameters

data

Description

The data to plot predictions for.

For example, use a two-document slice of the original dataset (refer to the example below).

Possible types:

  • numpy.array
  • pandas.DataFrame
  • pandas.SparseDataFrame
  • scipy.sparse.spmatrix (all subclasses except dia_matrix)
  • catboost.Pool

Default value

Required parameter

features_to_change

Description

The list of numerical features to vary the prediction value for.

For example, chose the required features by selecting top N most important features that impact the prediction results for a pair of objects according to PredictionDiff (refer to the example below).

Possible types

  • list of int
  • string
  • combination of list of int & string

Default value

Required parameter

plot

Description

Plot a Jupyter Notebook chart based on the calculated predictions.

Possible types

bool

Default value

True

plot_file

Description

The name of the output HTML-file to save the chart to.

Possible types

string

Default value

1 (the trees are applied sequentially: the first tree, then the first two
trees, etc.)

Return value

Dict with two fields:

  • paramsdict of best-found parameters.
  • cv_resultsdict or pandas.core.frame.DataFrame with cross-validation results. Сolumns are: test-error-mean, test-error-std, train-error-mean, train-error-std.

Examples

import numpy as np
from catboost import Pool, CatBoostRegressor

train_data = np.random.randint(0, 100, size=(100, 10))
train_label = np.random.randint(0, 1000, size=(100))
train_pool = Pool(train_data, train_label)
train_pool_slice = train_pool.slice([2, 3])

model = CatBoostRegressor()
model.fit(train_pool)

prediction_diff = model.get_feature_importance(train_pool_slice,
                                               type='PredictionDiff',
                                               prettified=True)

model.plot_predictions(data=train_pool_slice,
                       features_to_change=prediction_diff["Feature Id"][:2],
                       plot=True,
                       plot_file="plot_predictions_file.html")

An example of the first plotted chart: