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Source Code for Module fuzzy.defuzzify.Dict

 1  # -*- coding: utf-8 -*- 
 2  # 
 3  # Copyright (C) 2009  Rene Liebscher 
 4  # 
 5  # This program is free software; you can redistribute it and/or modify it under 
 6  # the terms of the GNU Lesser General Public License as published by the Free  
 7  # Software Foundation; either version 3 of the License, or (at your option) any 
 8  # later version. 
 9  # 
10  # This program is distributed in the hope that it will be useful, but WITHOUT  
11  # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
12  # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 
13  # details. 
14  #  
15  # You should have received a copy of the GNU Lesser General Public License 
16  # along with this program; if not, see <http://www.gnu.org/licenses/>.  
17  # 
18   
19  """Not a real defuzzification. 
20  Just stores the adjective memberships in a dictionary for output.""" 
21   
22  __revision__ = "$Id: Dict.py,v 1.9 2010-03-28 18:40:33 rliebscher Exp $" 
23   
24  from fuzzy.defuzzify.Base import Base 
25   
26 -class Dict(Base): 
27      """Not a real defuzzification. 
28         Just stores the adjective memberships 
29         in a dictionary for output. 
30         You should use in the adjectives instances of Set itself. 
31          
32         What can be done with this? 
33          
34         For example: 
35          
36         You want help with buying a car. 
37          
38         Input are your preferences:: 
39          speed, payload (1-10), ... 
40         (map to "very important, important, doesn't matter, not wanted, never" ;-) 
41          
42         Output are choices: 
43         cars with adjectives: ferrari, truck, ... 
44          
45         rules are as follows:: 
46          if speed->very_important && payload->never then car->ferrari 
47          if payload->very_important then car->truck 
48         ... and so on 
49          
50         Then you use this as follows:: 
51          input variables  
52          { speed:3, payload:1, ...}  
53          ==>  
54          output_variables 
55          { car: { 
56                   ferrari:0.1, 
57                   truck: 1.0, 
58                   ... 
59                 } 
60          } 
61         """ 
62 -    def __init__(self, *args, **keywords): 
63          super(Dict, self).__init__(*args, **keywords) 
64   
65 -    def getValue(self, variable): 
66          """no defuzzification just return membership values""" 
67          temp = {} 
68          for name, adjective in variable.adjectives.items(): 
69              # get precomputed adjective set membership 
70              temp[name] = adjective.getMembership() 
71          return temp 
72   

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