pmml.ada | R Documentation |
Generate the PMML representation for an ada object from the package ada.
## S3 method for class 'ada' pmml( model, model_name = "AdaBoost_Model", app_name = "SoftwareAG PMML Generator", description = "AdaBoost Model", copyright = NULL, model_version = NULL, transforms = NULL, missing_value_replacement = NULL, ... )
model |
An ada object. |
model_name |
A name to be given to the PMML model. |
app_name |
The name of the application that generated the PMML. |
description |
A descriptive text for the Header element of the PMML. |
copyright |
The copyright notice for the model. |
model_version |
A string specifying the model version. |
transforms |
Data transformations. |
missing_value_replacement |
Value to be used as the 'missingValueReplacement' attribute for all MiningFields. |
... |
Further arguments passed to or from other methods. |
Export the ada model in the PMML MiningModel (multiple models) format. The MiningModel element consists of a list of TreeModel elements, one in each model segment.
This function implements the discrete adaboost algorithm only. Note that each segment tree is a classification model, returning either -1 or 1. However the MiningModel (ada algorithm) is doing a weighted sum of the returned value, -1 or 1. So the value of attribute functionName of element MiningModel is set to "regression"; the value of attribute functionName of each segment tree is also set to "regression" (they have to be the same as the parent MiningModel per PMML schema). Although each segment/tree is being named a "regression" tree, the actual returned score can only be -1 or 1, which practically turns each segment into a classification tree.
The model in PMML format has 5 different outputs. The "rawValue" output is the value of the model expressed as a tree model. The boosted tree model uses a transformation of this value, this is the "boostValue" output. The last 3 outputs are the predicted class and the probabilities of each of the 2 classes (The ada package Boosted Tree models can only handle binary classification models).
Wen Lin
ada: an R package for stochastic boosting (on CRAN)
## Not run: library(ada) data(audit) fit <- ada(Adjusted ~ Employment + Education + Hours + Income, iter = 3, audit) fit_pmml <- pmml(fit) ## End(Not run)
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