h2o.upliftRandomForest: Build a Uplift Random Forest model

View source: R/upliftrandomforest.R

h2o.upliftRandomForestR Documentation

Build a Uplift Random Forest model

Description

Builds a Uplift Random Forest model on an H2OFrame.

Usage

h2o.upliftRandomForest(
  x,
  y,
  training_frame,
  treatment_column,
  model_id = NULL,
  validation_frame = NULL,
  score_each_iteration = FALSE,
  score_tree_interval = 0,
  ignore_const_cols = TRUE,
  ntrees = 50,
  max_depth = 20,
  min_rows = 1,
  nbins = 20,
  nbins_top_level = 1024,
  nbins_cats = 1024,
  max_runtime_secs = 0,
  seed = -1,
  mtries = -2,
  sample_rate = 0.632,
  sample_rate_per_class = NULL,
  col_sample_rate_change_per_level = 1,
  col_sample_rate_per_tree = 1,
  histogram_type = c("AUTO", "UniformAdaptive", "Random", "QuantilesGlobal",
    "RoundRobin", "UniformRobust"),
  categorical_encoding = c("AUTO", "Enum", "OneHotInternal", "OneHotExplicit",
    "Binary", "Eigen", "LabelEncoder", "SortByResponse", "EnumLimited"),
  distribution = c("AUTO", "bernoulli", "multinomial", "gaussian", "poisson", "gamma",
    "tweedie", "laplace", "quantile", "huber"),
  check_constant_response = TRUE,
  uplift_metric = c("AUTO", "KL", "Euclidean", "ChiSquared"),
  auuc_type = c("AUTO", "qini", "lift", "gain"),
  auuc_nbins = -1,
  verbose = FALSE
)

Arguments

x

(Optional) A vector containing the names or indices of the predictor variables to use in building the model. If x is missing, then all columns except y are used.

y

The name or column index of the response variable in the data. The response must be either a numeric or a categorical/factor variable. If the response is numeric, then a regression model will be trained, otherwise it will train a classification model.

training_frame

Id of the training data frame.

treatment_column

Define the column which will be used for computing uplift gain to select best split for a tree. The column has to divide the dataset into treatment (value 1) and control (value 0) groups. Defaults to treatment.

model_id

Destination id for this model; auto-generated if not specified.

validation_frame

Id of the validation data frame.

score_each_iteration

Logical. Whether to score during each iteration of model training. Defaults to FALSE.

score_tree_interval

Score the model after every so many trees. Disabled if set to 0. Defaults to 0.

ignore_const_cols

Logical. Ignore constant columns. Defaults to TRUE.

ntrees

Number of trees. Defaults to 50.

max_depth

Maximum tree depth (0 for unlimited). Defaults to 20.

min_rows

Fewest allowed (weighted) observations in a leaf. Defaults to 1.

nbins

For numerical columns (real/int), build a histogram of (at least) this many bins, then split at the best point Defaults to 20.

nbins_top_level

For numerical columns (real/int), build a histogram of (at most) this many bins at the root level, then decrease by factor of two per level Defaults to 1024.

nbins_cats

For categorical columns (factors), build a histogram of this many bins, then split at the best point. Higher values can lead to more overfitting. Defaults to 1024.

max_runtime_secs

Maximum allowed runtime in seconds for model training. Use 0 to disable. Defaults to 0.

seed

Seed for random numbers (affects certain parts of the algo that are stochastic and those might or might not be enabled by default). Defaults to -1 (time-based random number).

mtries

Number of variables randomly sampled as candidates at each split. If set to -1, defaults to sqrtp for classification and p/3 for regression (where p is the # of predictors Defaults to -2.

sample_rate

Row sample rate per tree (from 0.0 to 1.0) Defaults to 0.632.

sample_rate_per_class

A list of row sample rates per class (relative fraction for each class, from 0.0 to 1.0), for each tree

col_sample_rate_change_per_level

Relative change of the column sampling rate for every level (must be > 0.0 and <= 2.0) Defaults to 1.

col_sample_rate_per_tree

Column sample rate per tree (from 0.0 to 1.0) Defaults to 1.

histogram_type

What type of histogram to use for finding optimal split points Must be one of: "AUTO", "UniformAdaptive", "Random", "QuantilesGlobal", "RoundRobin", "UniformRobust". Defaults to AUTO.

categorical_encoding

Encoding scheme for categorical features Must be one of: "AUTO", "Enum", "OneHotInternal", "OneHotExplicit", "Binary", "Eigen", "LabelEncoder", "SortByResponse", "EnumLimited". Defaults to AUTO.

distribution

Distribution function Must be one of: "AUTO", "bernoulli", "multinomial", "gaussian", "poisson", "gamma", "tweedie", "laplace", "quantile", "huber". Defaults to AUTO.

check_constant_response

Logical. Check if response column is constant. If enabled, then an exception is thrown if the response column is a constant value.If disabled, then model will train regardless of the response column being a constant value or not. Defaults to TRUE.

uplift_metric

Divergence metric used to find best split when building an uplift tree. Must be one of: "AUTO", "KL", "Euclidean", "ChiSquared". Defaults to AUTO.

auuc_type

Metric used to calculate Area Under Uplift Curve. Must be one of: "AUTO", "qini", "lift", "gain". Defaults to AUTO.

auuc_nbins

Number of bins to calculate Area Under Uplift Curve. Defaults to -1.

verbose

Logical. Print scoring history to the console (Metrics per tree). Defaults to FALSE.

Value

Creates a H2OModel object of the right type.

See Also

predict.H2OModel for prediction


h2o documentation built on Aug. 9, 2023, 9:06 a.m.