R: FRBCS.W model building

FRBCS.W {frbs}

R Documentation

FRBCS.W model building

Description

This is the internal function that implements the fuzzy rule-based classification system with weight factor (FRBCS.W). It is used to solve classification tasks. Users do not need to call it directly, but just use frbs.learn and predict. This method is suitable only for classification problems.

Usage

FRBCS.W(range.data, data.train, num.labels, num.class, type.mf,
  type.tnorm = "MIN", type.snorm = "MAX",
  type.implication.func = "ZADEH")

Arguments

`range.data`	a matrix (`2 \times n`) containing the range of the normalized data, where `n` is the number of variables, and first and second rows are the minimum and maximum values, respectively.
`data.train`	a matrix (`m \times n`) of normalized data for the training process, where `m` is the number of instances and `n` is the number of variables; the last column is the output variable. Note the data must be normalized between 0 and 1.
`num.labels`	a matrix (`1 \times n`), whose elements represent the number of labels (linguistic terms); `n` is the number of variables.
`num.class`	an integer number representing the number of labels (linguistic terms).
`type.mf`	the type of the shape of the membership functions.
`type.tnorm`	the type of t-norm. See `inference`.
`type.snorm`	the type of s-norm. See `inference`.
`type.implication.func`	the type of implication function. See `WM`.

Details

This method is adopted from Ishibuchi and Nakashima's paper. Each fuzzy IF-THEN rule consists of antecedent linguistic values and a single consequent class with certainty grades (weights). The antecedent part is determined by a grid-type fuzzy partition from the training data. The consequent class is defined as the dominant class in the fuzzy subspace corresponding to the antecedent part of each fuzzy IF-THEN rule and the certainty grade is calculated from the ratio among the consequent class. A class of the new instance is determined by the consequent class of the rule with the maximal product of the compatibility grade and the certainty grade.

References