plot_predictions

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

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.ndarray
• pandas.DataFrame
• pandas.SparseDataFrame
• scipy.sparse.spmatrix
• catboost.Pool

Default value

Required parameter

features_to_change

Description

To reduce the number of trees to use when the model is applied or the metrics are calculated, set the 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

None (the files is not saved)

Return value

Dict with two fields:

• params — dict of best-found parameters.
• cv_results — dict 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, CatBoostClassifier

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

model = CatBoostClassifier()
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: