pyFTS/common.py
2016-10-18 17:44:03 -02:00

93 lines
2.3 KiB
Python

import numpy as np
from pyFTS import *
def differential(original):
n = len(original)
diff = [ original[t-1]-original[t] for t in np.arange(1,n) ]
diff.insert(0,0)
return np.array(diff)
def trimf(x,parameters):
if(x < parameters[0]):
return 0
elif(x >= parameters[0] and x < parameters[1]):
return (x-parameters[0])/(parameters[1]-parameters[0])
elif(x >= parameters[1] and x <= parameters[2]):
return (parameters[2]-x)/(parameters[2]-parameters[1])
else:
return 0
def trapmf(x, parameters):
if(x < parameters[0]):
return 0
elif(x >= parameters[0] and x < parameters[1]):
return (x-parameters[0])/(parameters[1]-parameters[0])
elif(x >= parameters[1] and x <= parameters[2]):
return 1
elif(x >= parameters[2] and x <= parameters[3]):
return (parameters[3]-x)/(parameters[3]-parameters[2])
else:
return 0
def gaussmf(x,parameters):
return math.exp(-0.5*((x-parameters[0]) / parameters[1] )**2)
def bellmf(x,parameters):
return 1 / (1 + abs((xx - parameters[2])/parameters[0])**(2*parameters[1]))
def sigmf(x,parameters):
return 1 / (1 + math.exp(-parameters[0] * (x - parameters[1])))
class FuzzySet:
def __init__(self,name,mf,parameters,centroid):
self.name = name
self.mf = mf
self.parameters = parameters
self.centroid = centroid
self.lower = min(parameters)
self.upper = max(parameters)
def membership(self,x):
return self.mf(x,self.parameters)
def __str__(self):
return self.name + ": " + str(self.mf) + "(" + str(self.parameters) + ")"
class FLR:
def __init__(self,LHS,RHS):
self.LHS = LHS
self.RHS = RHS
def __str__(self):
return str(self.LHS) + " -> " + str(self.RHS)
def fuzzyInstance(inst, fuzzySets):
mv = np.array([ fs.membership(inst) for fs in fuzzySets])
return mv
def fuzzySeries(data,fuzzySets):
fts = []
for item in data:
mv = fuzzyInstance(item,fuzzySets)
fts.append(fuzzySets[ np.argwhere(mv == max(mv) )[0,0] ])
return fts
def generateNonRecurrentFLRs(fuzzyData):
flrs = {}
for i in range(2,len(fuzzyData)):
tmp = FLR(fuzzyData[i-1],fuzzyData[i])
flrs[str(tmp)] = tmp
ret = [value for key, value in flrs.items()]
return ret
def generateRecurrentFLRs(fuzzyData):
flrs = []
for i in np.arange(1,len(fuzzyData)):
flrs.append(FLR(fuzzyData[i-1],fuzzyData[i]))
return flrs