Source code for pyFTS.common.Composite

"""
Composite Fuzzy Sets
"""

import numpy as np
from pyFTS import *
from pyFTS.common import Membership, FuzzySet


[docs]class FuzzySet(FuzzySet.FuzzySet): """ Composite Fuzzy Set """ def __init__(self, name, superset=False, **kwargs): """ Create an empty composite fuzzy set :param name: fuzzy set name """ if 'type' in kwargs: kwargs.pop('type') super(FuzzySet, self).__init__(name, None, None, None, type='composite', **kwargs) self.superset = superset if self.superset: self.sets = [] else: self.mf = [] self.parameters = [] self.lower = None self.upper = None self.centroid = None
[docs] def membership(self, x): """ Calculate the membership value of a given input :param x: input value :return: membership value of x at this fuzzy set """ if self.superset: return max([s.membership(x) for s in self.sets]) else: return min([self.mf[ct](self.transform(x), self.parameters[ct]) for ct in np.arange(0, len(self.mf))])
[docs] def transform(self, x): return self.sets[0].transform(x)
[docs] def append(self, mf, parameters): """ Adds a new function to composition :param mf: :param parameters: :return: """ self.mf.append(mf) self.parameters.append(parameters)
[docs] def append_set(self, set): """ Adds a new function to composition :param mf: :param parameters: :return: """ self.sets.append(set) if self.lower is None or self.lower > set.lower: self.lower = set.lower if self.upper is None or self.upper < set.upper: self.upper = set.upper if self.centroid is None or self.centroid < set.centroid: self.centroid = set.centroid