Application of Fuzzy Logic Akira Imada Brest State Technical University
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1 A slide show of our Lecture Note Application of Fuzzy Logic Akira Imada Brest State Technical University Last modified on 29 October 2016
2 (Contemporary Intelligent Information Techniques) 2 I. Fuzzy Basic Arithmetics
3 (Contemporary Intelligent Information Techniques) 3 Membership Function In Fuzzy logic the probability of how likely A is true is called membership value of A and expressed as µ A. E.g., assuming A = beer is cold, µ A = 1 when temperature of beer is 5 C, while µ A = 0.5 when temperature of beer is 10 C, and µ A = 0 when temperature of beer is 15 C.
4 (Contemporary Intelligent Information Techniques) 4 AND and OR Membership of A AND B and A OR B are given, respectively, as µ A B (x) = min{µ A (x), µ B (x)} and µ A B (x) = max{µ A (x), µ B (x)}
5 (Contemporary Intelligent Information Techniques) 5 IF-THEN Membership of IF A THEN B has proposed by many but here we use this Larsen s proposal. µ A B (x) = µ A (x) µ B (x)
6 (Contemporary Intelligent Information Techniques) 6 4. De-fuzzification When A has some different possibility, we determine most possible value of A by calculating the center of gravity of these membership values. i µ A i (x x i ) = 0 E.g.
7 (Contemporary Intelligent Information Techniques) 7 II. Fuzzy Controller
8 (Contemporary Intelligent Information Techniques) 8 Controll two metro cars Let s create a virtual metro system with 2 cars on a loop line with 1000 pixels. Each car has a pair of 3 parameters of speed x, distance to the car in front y and strength of brake z.
9 (Contemporary Intelligent Information Techniques) 9 Membership function of Speed, Distance and Brake assumed here.
10 (Contemporary Intelligent Information Techniques) 10 Membership value of a rule with specific speed, distance and brake. E.g. The membership value below implies how this brake = 4 will be likely when speed = 7 and distance = 500 under the rule below.
11 (Contemporary Intelligent Information Techniques) 11 An example of Membership value of one rule Membership value of brake = 0,1,2,3,4,5,6,7,8,9 when speed = 20 and distance = 650 under the rule IF speed = medium AND distance = long THEN brake = medium. From the work by Korol Andrey (2015 Fall)
12 (Contemporary Intelligent Information Techniques) 12 Membership value of two rules
13 (Contemporary Intelligent Information Techniques) 13 Membership function of three rules for a pair of a speed and a distance
14 (Contemporary Intelligent Information Techniques) 14 Membership value of 3 rules for a pair of speed & distance From the work by Yulia Bogutskaya (2016 Fall)
15 (Contemporary Intelligent Information Techniques) 15 Defuzzified value of break for a pair of a speed and a distance From the work by Kuchur Alexander (2015 Fall)
16 (Contemporary Intelligent Information Techniques) 16 Membership value of 3 rules for 3 pairs of speed & distance
17 (Contemporary Intelligent Information Techniques) Membership function of 25 rules all combination of speed = very slow..., distance = very short
18 (Contemporary Intelligent Information Techniques) D surface of speed-distance-brake An example of how to draw for a fixed speed and three diferent value of distances/ From the work by Bokhanov Evgenii (2015 Fall)
19 (Contemporary Intelligent Information Techniques) Control metros by 3-D surface of speed-distance-brake
20 (Contemporary Intelligent Information Techniques) 20 III. Fuzzy Classification
21 (Contemporary Intelligent Information Techniques) 21 An example of classification - 3 families of fish
22 (Contemporary Intelligent Information Techniques) Rules to classify as an example
23 (Contemporary Intelligent Information Techniques) Memership function for the size of two parts µ(x) = exp{ (x avg)2 std 2 }
24 (Contemporary Intelligent Information Techniques) 24? How we specify avg and std for each of membership function from dataset given?
25 (Contemporary Intelligent Information Techniques) 25 Question: Which family is this new fish?
26 (Contemporary Intelligent Information Techniques) Takagi Sugeno Formula R k : If x 1 is A k 1, and x 2 is A k 2 and and x N is A k N then y is gk.
27 (Contemporary Intelligent Information Techniques) 27 Takagi-Sugeno rules: Estimation of a single input Estimation of y for an input x = (x 1, x 2,, x N ) y j = H k=1 (M k(x) g k ) H k=1 M k(x) where N M k (x) = µ ik (x i ) i=1 where µ ik is i-th attribute of k-th rule
28 (Contemporary Intelligent Information Techniques) 28 Three rules to classify
29 (Contemporary Intelligent Information Techniques) 29 A benchmark Iris database Iris flower dataset (taken from University of California Urvine Machine Learning Repository) consists of three species of iris flower setosa, versicolor and virginica. Each sample represents four attributes of the iris flower sepal-length, sepal-width, petal-length, and petal-width.
30 (Contemporary Intelligent Information Techniques) 30 Iris Flower Database to design Setosa Versicolor Virginica x 1 x 2 x 3 x 4 x 1 x 2 x 3 x 4 x 1 x 2 x 3 x
31 (Contemporary Intelligent Information Techniques) 31 Iris Flower Database to validate Setosa Versicolor Virginica x 1 x 2 x 3 x 4 x 1 x 2 x 3 x 4 x 1 x 2 x 3 x
32 (Contemporary Intelligent Information Techniques) 32 IV. Time-series prediction by Fuzzy
33 (Contemporary Intelligent Information Techniques) 33 Forcasting a value from its history Assume y(t) is a value of a variable y at time t such as maximum price of a stock during a day. Then T-S formula for singleton consequeance is as follows 1. R i : If y(t 1) is A i 1 and y(t 2) is A i 2 and and y(t n + 1) is A i n then y(t) is g i.
34 (Contemporary Intelligent Information Techniques) 34 Forcasting a value from other related items R i : If x 1 (t) is A i 1 and x 2 (t) is A i 2 and and x n (t) is A i n then y(t) is g i.
35 (Contemporary Intelligent Information Techniques) 35 V. Fuzzy Clustering
36 (Contemporary Intelligent Information Techniques) Fuzzy Relation Example 4... X = {green, yellow, red}, Y = {unripe, semiripe, ripe}. We may assume that a red apple is provably ripe, but a green apple is most likely, and so on. Thus, for example: X \ Y unripe semiripe ripe green yellow red Let s call this relation R 1. Then we think a similar but new Relation.
37 (Contemporary Intelligent Information Techniques) 37 Now 2. Combine two fuzzy relations and Y = {unripe, semiripe, ripe} Let s call this relation R 2. Z = {sour, sour sweet, sweet} X \ Y sour sour-sweet sweet unripen semiripe ripe
38 (Contemporary Intelligent Information Techniques) 38 Combine two fuzzy relations - continued We combine these two relations R 1 and R 2 by the formula the result is: µ R (x, z) max y X {min{µ R(x, y), µ R (y, z)}}, X \ Y sour sour-sweet sweet red yellow green
39 (Contemporary Intelligent Information Techniques) 39 Expression by our daily language This relation could be expressed by our daily language like If tomato is red then it s most likely sweet, possibly sour-sweet, and unlikely sour. If tomato is yellow then probably it s sour-sweet, possibly sour, maybe sweet. If tomato is green then almost always sour, less likely sour-sweet, unlikely sweet. Or, we could say: Now tomato is more or less red, then what is taste like?
40 (Contemporary Intelligent Information Techniques) Clustering by Fuzzy Relation of Proximity
41 (Contemporary Intelligent Information Techniques) 41 Algorithm 1 1. Calculate a max-min similarity-relation R = [a ij ] 2. Set a ij = 0 for all a ij < α and i = j 3. Select s and t such that a st = max{a ij i < j& i, j I}. When tie, select one of these pairs at random WHILE a st 0 DO put s and t into the same cluster C = {s, t} ELSE 4. ELSE all indices I into separated clusters and STOP 4. Choose u I C such that a iu = max { a ij a ij 0} j I C i C i C When a tie, select one such u at random. WHILE such a u exists, put u into C = {s, t, u} and REPEAT Let I = I C and GOTO 3.
42 (Contemporary Intelligent Information Techniques) 42 Example: Let s Start with the following R ( 0), R (0) =
43 (Contemporary Intelligent Information Techniques) 43 Then repeat R (n+1) = R (n) R (n) till R (n) = R (n+1) R (n) =
44 (Contemporary Intelligent Information Techniques) 44 Now ssumming α = 0.55 apply [1.] and [2.]
45 (Contemporary Intelligent Information Techniques) 45 First, set I = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and C = { }. Then 3. Now a 18 = a 26 = a 5 10 = 0.9 are maximum and a 18 is randomly selected. Then C = {1, 8}. 4. a 12 + a 82 = a 14 + a 84 = 1.5 are maximum and j = 4 is randomly selected. Then C = {1, 8, 4}. 4. a 12 + a 42 + a 82 = 2.1 is maximum, then C = {1, 8, 4, 2}. 4. There are no j such that a 1j + a 2j + a 4j + a 8j is maximum. Then final C = {1, 8, 4, 2}. a 16 +a 26 +a 46 +a 86 = = 2.2 seems maximum but actually not because a 46 = 0 Note that i C a iu = max j I\C { i C a ij a ij 0}
46 (Contemporary Intelligent Information Techniques) Let I = {3, 5, 6, 7, 9, 10} 3. a 5 10 = 0.9 is maximum. Then renew C as {5, 10}. 4. a 59 + a 10 9 = 1.5 is maximum. Then C = {5, 10, 9}. 4. There are no j in {3, 6, 9} such that a 5j + a 9j + a 10j is maximum. Then final C = {5, 10, 9}. 5. Let I = {3, 6, 7}. 3. Now a 36 = a 37 = a 67 = 0. Then {3}, {6}and {7}are three separated clusters. In fact, a 33 a 36 a a 63 a 66 a 67 = a 73 a 76 a So i {3,6,7} a iu = max j {3,6,7} { i C a ij a ij 0} does not exit any more. In this way, when α = 0.55, we have 5 clasters {1, 8, 4, 2},{5, 10, 9}, {3}, {6} and {7} are obtained.
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