DaMiR.EnsL_Train: Train a Binary Classifier using 'Staking' Learning strategy.

In DaMiRseq: Data Mining for RNA-seq data: normalization, feature selection and classification

Description

This function learn a meta learner by a 'Stacking' strategy. Users can provide heterogeneous features (other than genomic features) which will be taken into account during classification model building. A 'two-classes' classification task isaddressed.

Usage

DaMiR.EnsL_Train(data, classes, variables, fSample.tr.w = 0.7,
  cl_type = c("RF", "SVM", "LDA", "LR", "NB", "NN", "PLS"))

Arguments

data	A SummarizedExperiment object or a data frame/matrix of normalized expression data. Rows and Cols should be observations and features, respectively.
classes	A class vector with nrow(data) elements. Each element represents the class label for each observation. Two different class labels are allowed. Note. this argument should not be set when 'data' is a SummarizedExperiment object
variables	An optional data frame containing other variables (but without 'class' column). Each column represents a different covariate to be considered in the model
fSample.tr.w	Fraction of samples of training set to be used during weight estimation; default is 0.7
cl_type	List of weak classifiers that will compose the meta-learners. "RF", "SVM", "LDA", "LR", "NB", "NN", "PLS" are allowed. Default is c("RF", "LR", "LDA", "NB", "SVM")

Details

This function implements the training step of DaMiR.EnsembleLearning2cl function

Value

A list containing:

• The models of each classifier used to build the Ensemble meta-learner with the median or the best accuracy (over the iteration) for the Ensemble classifier;

• the weights associated to each weak classifier;

Author(s)

Mattia Chiesa, Luca Piacentini

Examples

# use example data:
data(selected_features)
data(df)
set.seed(1)
# For the example:
# speed up the process setting a low 'iter' argument value;
# for real data set use default 'iter' value (i.e. 100) or higher:
#  Classification_res <- DaMiR.EnsL_Train(
#  selected_features,classes=df$class, fSample.tr.w=0.6, iter=3,
# cl_type=c("RF","LR"))

DaMiRseq documentation built on Nov. 8, 2020, 5:53 p.m.