RemixAutoML (version 0.4.2)

AutoH2oDRFClassifier: AutoH2oDRFClassifier is an automated H2O modeling framework with grid-tuning and model evaluation

Description

AutoH2oDRFClassifier is an automated H2O modeling framework with grid-tuning and model evaluation that runs a variety of steps. First, a stratified sampling (by the target variable) is done to create train and validation sets. Then, the function will run a random grid tune over N number of models and find which model is the best (a default model is always included in that set). Once the model is identified and built, several other outputs are generated: validation data with predictions, evaluation plot, evaluation metrics, variable importance, partial dependence calibration plots, and column names used in model fitting.

Usage

AutoH2oDRFClassifier(
  data,
  TrainOnFull = FALSE,
  ValidationData = NULL,
  TestData = NULL,
  TargetColumnName = NULL,
  FeatureColNames = NULL,
  WeightsColumn = NULL,
  MaxMem = {     gc()    
    paste0(as.character(floor(as.numeric(system("awk '/MemFree/ {print $2}' /proc/meminfo",
    intern = TRUE))/1e+06)), "G") },
  NThreads = max(1L, parallel::detectCores() - 2L),
  model_path = NULL,
  metadata_path = NULL,
  ModelID = "FirstModel",
  NumOfParDepPlots = 3L,
  ReturnModelObjects = TRUE,
  SaveModelObjects = FALSE,
  SaveInfoToPDF = FALSE,
  IfSaveModel = "mojo",
  H2OShutdown = FALSE,
  H2OStartUp = TRUE,
  GridTune = FALSE,
  GridStrategy = "Cartesian",
  MaxRuntimeSecs = 60 * 60 * 24,
  StoppingRounds = 10,
  MaxModelsInGrid = 2,
  eval_metric = "auc",
  CostMatrixWeights = c(1, 0, 0, 1),
  Trees = 50L,
  MaxDepth = 20L,
  SampleRate = 0.632,
  MTries = -1,
  ColSampleRatePerTree = 1,
  ColSampleRatePerTreeLevel = 1,
  MinRows = 1,
  NBins = 20,
  NBinsCats = 1024,
  NBinsTopLevel = 1024,
  HistogramType = "AUTO",
  CategoricalEncoding = "AUTO"
)

Arguments

data

This is your data set for training and testing your model

TrainOnFull

Set to TRUE to train on full data

ValidationData

This is your holdout data set used in modeling either refine your hyperparameters.

TestData

This is your holdout data set. Catboost using both training and validation data in the training process so you should evaluate out of sample performance with this data set.

TargetColumnName

Either supply the target column name OR the column number where the target is located (but not mixed types). Note that the target column needs to be a 0 | 1 numeric variable.

FeatureColNames

Either supply the feature column names OR the column number where the target is located (but not mixed types)

WeightsColumn

Column name of a weights column

MaxMem

Set the maximum amount of memory you'd like to dedicate to the model run. E.g. "32G"

NThreads

Set the number of threads you want to dedicate to the model building

model_path

A character string of your path file to where you want your output saved

metadata_path

A character string of your path file to where you want your model evaluation output saved. If left NULL, all output will be saved to model_path.

ModelID

A character string to name your model and output

NumOfParDepPlots

Tell the function the number of partial dependence calibration plots you want to create.

ReturnModelObjects

Set to TRUE to output all modeling objects (E.g. plots and evaluation metrics)

SaveModelObjects

Set to TRUE to return all modeling objects to your environment

SaveInfoToPDF

Set to TRUE to save modeling information to PDF. If model_path or metadata_path aren't defined then output will be saved to the working directory

IfSaveModel

Set to "mojo" to save a mojo file, otherwise "standard" to save a regular H2O model object

H2OShutdown

Set to TRUE to shutdown H2O after running the function

H2OStartUp

Defaults to TRUE which means H2O will be started inside the function

GridTune

Set to TRUE to run a grid tuning procedure. Set a number in MaxModelsInGrid to tell the procedure how many models you want to test.

GridStrategy

Default "Cartesian"

MaxRuntimeSecs

Default 86400

StoppingRounds

Default 10

MaxModelsInGrid

Number of models to test from grid options (1080 total possible options)

eval_metric

This is the metric used to identify best grid tuned model. Choose from "AUC" or "logloss"

CostMatrixWeights

A vector with 4 elements c(True Positive Cost, False Negative Cost, False Positive Cost, True Negative Cost). Default c(1,0,0,1),

Trees

The maximum number of trees you want in your models

MaxDepth

Default 20

SampleRate

Default 0.632

MTries

Default -1 means it will default to number of features divided by 3

ColSampleRatePerTree

Default 1

ColSampleRatePerTreeLevel

Default 1

MinRows

Default 1

NBinsCats

Default 1024

NBinsTopLevel

Default 1024

HistogramType

Default "AUTO"

CategoricalEncoding

Default "AUTO"

Value

Saves to file and returned in list: VariableImportance.csv, Model, ValidationData.csv, EvalutionPlot.png, EvaluationMetrics.csv, ParDepPlots.R a named list of features with partial dependence calibration plots, GridCollect, and GridList

See Also

Other Automated Supervised Learning - Binary Classification: AutoCatBoostClassifier(), AutoH2oGAMClassifier(), AutoH2oGBMClassifier(), AutoH2oGLMClassifier(), AutoH2oMLClassifier(), AutoXGBoostClassifier()

Examples

# NOT RUN {
# Create some dummy correlated data
data <- RemixAutoML::FakeDataGenerator(
  Correlation = 0.85,
  N = 1000L,
  ID = 2L,
  ZIP = 0L,
  AddDate = FALSE,
  Classification = TRUE,
  MultiClass = FALSE)

TestModel <- RemixAutoML::AutoH2oDRFClassifier(

    # Compute management args
    MaxMem = {gc();paste0(as.character(floor(as.numeric(system("awk '/MemFree/ {print $2}' /proc/meminfo", intern=TRUE)) / 1000000)),"G")},
    NThreads = max(1L, parallel::detectCores() - 2L),
    IfSaveModel = "mojo",
    H2OShutdown = FALSE,
    H2OStartUp = TRUE,

    # Model evaluation args
    eval_metric = "auc",
    NumOfParDepPlots = 3L,
    CostMatrixWeights = c(1,0,0,1),

    # Metadata args
    model_path = normalizePath("./"),
    metadata_path = NULL,
    ModelID = "FirstModel",
    ReturnModelObjects = TRUE,
    SaveModelObjects = FALSE,
    SaveInfoToPDF = FALSE,

    # Data args
    data,
    TrainOnFull = FALSE,
    ValidationData = NULL,
    TestData = NULL,
    TargetColumnName = "Adrian",
    FeatureColNames = names(data)[!names(data) %in% c("IDcol_1", "IDcol_2", "Adrian")],
    WeightsColumn = NULL,

    # Grid Tuning Args
    GridStrategy = "Cartesian",
    GridTune = FALSE,
    MaxModelsInGrid = 10,
    MaxRuntimeSecs = 60*60*24,
    StoppingRounds = 10,

    # Model args
    Trees = 50L,
    MaxDepth = 20,
    SampleRate = 0.632,
    MTries = -1,
    ColSampleRatePerTree = 1,
    ColSampleRatePerTreeLevel = 1,
    MinRows = 1,
    NBins = 20,
    NBinsCats = 1024,
    NBinsTopLevel = 1024,
    HistogramType = "AUTO",
    CategoricalEncoding = "AUTO")
# }