spark.decisionTree {SparkR} | R Documentation |

`spark.decisionTree`

fits a Decision Tree Regression model or Classification model on
a SparkDataFrame. Users can call `summary`

to get a summary of the fitted Decision Tree
model, `predict`

to make predictions on new data, and `write.ml`

/`read.ml`

to
save/load fitted models.
For more details, see
Decision Tree Regression and
Decision Tree Classification

spark.decisionTree(data, formula, ...) ## S4 method for signature 'SparkDataFrame,formula' spark.decisionTree(data, formula, type = c("regression", "classification"), maxDepth = 5, maxBins = 32, impurity = NULL, seed = NULL, minInstancesPerNode = 1, minInfoGain = 0, checkpointInterval = 10, maxMemoryInMB = 256, cacheNodeIds = FALSE, handleInvalid = c("error", "keep", "skip")) ## S4 method for signature 'DecisionTreeRegressionModel' summary(object) ## S3 method for class 'summary.DecisionTreeRegressionModel' print(x, ...) ## S4 method for signature 'DecisionTreeClassificationModel' summary(object) ## S3 method for class 'summary.DecisionTreeClassificationModel' print(x, ...) ## S4 method for signature 'DecisionTreeRegressionModel' predict(object, newData) ## S4 method for signature 'DecisionTreeClassificationModel' predict(object, newData) ## S4 method for signature 'DecisionTreeRegressionModel,character' write.ml(object, path, overwrite = FALSE) ## S4 method for signature 'DecisionTreeClassificationModel,character' write.ml(object, path, overwrite = FALSE)

`data` |
a SparkDataFrame for training. |

`formula` |
a symbolic description of the model to be fitted. Currently only a few formula operators are supported, including '~', ':', '+', and '-'. |

`...` |
additional arguments passed to the method. |

`type` |
type of model, one of "regression" or "classification", to fit |

`maxDepth` |
Maximum depth of the tree (>= 0). |

`maxBins` |
Maximum number of bins used for discretizing continuous features and for choosing how to split on features at each node. More bins give higher granularity. Must be >= 2 and >= number of categories in any categorical feature. |

`impurity` |
Criterion used for information gain calculation. For regression, must be "variance". For classification, must be one of "entropy" and "gini", default is "gini". |

`seed` |
integer seed for random number generation. |

`minInstancesPerNode` |
Minimum number of instances each child must have after split. |

`minInfoGain` |
Minimum information gain for a split to be considered at a tree node. |

`checkpointInterval` |
Param for set checkpoint interval (>= 1) or disable checkpoint (-1). Note: this setting will be ignored if the checkpoint directory is not set. |

`maxMemoryInMB` |
Maximum memory in MB allocated to histogram aggregation. |

`cacheNodeIds` |
If FALSE, the algorithm will pass trees to executors to match instances with nodes. If TRUE, the algorithm will cache node IDs for each instance. Caching can speed up training of deeper trees. Users can set how often should the cache be checkpointed or disable it by setting checkpointInterval. |

`handleInvalid` |
How to handle invalid data (unseen labels or NULL values) in features and label column of string type in classification model. Supported options: "skip" (filter out rows with invalid data), "error" (throw an error), "keep" (put invalid data in a special additional bucket, at index numLabels). Default is "error". |

`object` |
A fitted Decision Tree regression model or classification model. |

`x` |
summary object of Decision Tree regression model or classification model
returned by |

`newData` |
a SparkDataFrame for testing. |

`path` |
The directory where the model is saved. |

`overwrite` |
Overwrites or not if the output path already exists. Default is FALSE which means throw exception if the output path exists. |

`spark.decisionTree`

returns a fitted Decision Tree model.

`summary`

returns summary information of the fitted model, which is a list.
The list of components includes `formula`

(formula),
`numFeatures`

(number of features), `features`

(list of features),
`featureImportances`

(feature importances), and `maxDepth`

(max depth of
trees).

`predict`

returns a SparkDataFrame containing predicted labeled in a column named
"prediction".

spark.decisionTree since 2.3.0

summary(DecisionTreeRegressionModel) since 2.3.0

print.summary.DecisionTreeRegressionModel since 2.3.0

summary(DecisionTreeClassificationModel) since 2.3.0

print.summary.DecisionTreeClassificationModel since 2.3.0

predict(DecisionTreeRegressionModel) since 2.3.0

predict(DecisionTreeClassificationModel) since 2.3.0

write.ml(DecisionTreeRegressionModel, character) since 2.3.0

write.ml(DecisionTreeClassificationModel, character) since 2.3.0

```
## Not run:
##D # fit a Decision Tree Regression Model
##D df <- createDataFrame(longley)
##D model <- spark.decisionTree(df, Employed ~ ., type = "regression", maxDepth = 5, maxBins = 16)
##D
##D # get the summary of the model
##D summary(model)
##D
##D # make predictions
##D predictions <- predict(model, df)
##D
##D # save and load the model
##D path <- "path/to/model"
##D write.ml(model, path)
##D savedModel <- read.ml(path)
##D summary(savedModel)
##D
##D # fit a Decision Tree Classification Model
##D t <- as.data.frame(Titanic)
##D df <- createDataFrame(t)
##D model <- spark.decisionTree(df, Survived ~ Freq + Age, "classification")
## End(Not run)
```

[Package *SparkR* version 2.3.1 Index]