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September 9, 2015 19:36
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import random | |
import time | |
import copy | |
# Parameters | |
NUM_COLORS = 4 | |
NUM_ROWS = 17 | |
NUM_COLS = 17 | |
# Generate a random grid of color squares based off the parameters | |
def generateRandomSolution(): | |
solution = [] | |
for r in range(NUM_ROWS): | |
row = [] | |
for c in range(NUM_COLS): | |
row.append(random.randint(0, NUM_COLORS - 1)) | |
solution.append(row) | |
return solution | |
# Calculate the number of rectangles in a given potential solution | |
def calcScore(solution): | |
numRects = 0 | |
for rowA in range(NUM_ROWS): | |
for rowB in range(rowA + 1, NUM_ROWS): | |
for color in range(NUM_COLORS): | |
numMatches = 0 | |
for col in range(NUM_COLS): | |
if color == solution[rowA][col] == solution[rowB][col]: | |
numMatches += 1 | |
numRects += numMatches * (numMatches - 1) / 2 | |
return numRects | |
# Mutate a solution by the given percentage amount | |
def mutate(solution, amount): | |
# Make deep copy | |
sol = copy.deepcopy(solution) | |
for i in range(int(amount * NUM_ROWS * NUM_COLS)): | |
randRow = random.randint(0, NUM_ROWS - 1) | |
randCol = random.randint(0, NUM_COLS - 1) | |
sol[randRow][randCol] = random.randint(0, NUM_COLORS - 1) | |
return sol | |
# Given two parent solutions a/b and a weight, | |
# generate a child by taking rows from each parent | |
def crossover(a, b, weight): | |
child = [] | |
for r in range(NUM_ROWS): | |
child.append(a[r] if random.random() > weight else b[r]) | |
return child | |
########### | |
# Testing # | |
########### | |
# Generate parents | |
parentA = generateRandomSolution() | |
parentB = generateRandomSolution() | |
# Generate child | |
child = crossover(parentA, parentB, 0.5) | |
# Mutate child | |
mutatedChild = mutate(child, 0.25) | |
# prints a solution | |
def printSolution(solution): | |
print "\n".join(["".join([str(cell) for cell in row]) for row in solution]) | |
print "Parent A:" | |
printSolution(parentA) | |
print ">> %d rectangles" % calcScore(parentA) | |
print "\n" | |
print "Parent B:" | |
printSolution(parentB) | |
print ">> %d rectangles" % calcScore(parentB) | |
print "\n" | |
print "Child:" | |
printSolution(child) | |
print ">> %d rectangles" % calcScore(child) | |
print "\n" | |
print "Child mutated 25%:" | |
printSolution(mutatedChild) | |
print ">> %d rectangles" % calcScore(mutatedChild) |
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