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Spark Gradient-Boosted Trees Learner

KNIME Extension for Apache Spark core infrastructure version 2.3.0.v201807052104 by KNIME AG, Zurich, Switzerland

This node applies the Apache Spark Gradient-Boosted Trees (GBTs) algorithm.

Note: GBTs do not yet support multiclass classification. The class column needs to contain 0 and 1 as class labels. For multiclass problems, please use decision trees or Random Forests.

Please note that all data must be numeric, including the label column which needs to contain 0 and 1. Use the Spark Category To Number nodes to convert nominal values to numeric columns. The mapping dictionary of the converter node is the input of the second in port of this node.

Use the Spark Predictor node to apply the learned model to unseen data.

Options

Number of iterations
Number of iterations of boosting. In other words, the number of weak hypotheses used in the final model.
Max number of bins
Maximum number of bins used for splitting features (suggested value: 100).
Max depth
Maximum depth of the tree. E.g., depth 0 means 1 leaf node; depth 1 means 1 internal node + 2 leaf nodes. (suggested value: 4)
Loss function
Loss function used for minimization during gradient boosting. Available functions: Log Loss, Squared Error and Absolute Error. For details about the loss functions see the Losses documentation.
Is classification
Select this option for binary classification.
Learning rate
Learning rate for shrinking the contribution of each estimator. The learning rate should be between in the interval (0, 1]
Class column
The classification column. Must be numeric.
Feature Columns
The feature columns to learn the model from. Supports only numeric columns.

Input Ports

Input Spark DataFrame/RDD
PMML with the nominal values mapping dictionary

Output Ports

Spark MLlib Gradient-Boosted Trees Model

Update Site

To use this node in KNIME, install KNIME Extension for Apache Spark core infrastructure from the following update site:

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