AICup/code/aco/ant_colony.py

import os

dir = "c_prob/"
def ant_colony_opt(instance):
    fname = dir + instance.name + ".txt"

    # write .mat file for C++
    with open(fname, "w") as f:
        for i in range(instance.nPoints):
            print(" ".join(map(str, instance.dist_matrix[i])), file=f)

    # single core params
    params = {
        "eil76": (0.9, 8, 0.4, 1000, 500, 200, 30), # 543
        "d198": (0.9, 8, 0.4, 1000, 250, 125, 5), # 15871
        "ch130": (0.9, 8, 0.4, 1000, 1750, 25, 30), # 6212
        "kroA100": (0.9, 8, 0.4, 1000, 750, 100, 30), # 21378
        "lin318": (0.9, 8, 0.4, 1000, 500, 32, 30), # 43171
        "pcb442": (0.9, 8, 0.4, 1000, 450, 24, 3), # 52466
        "pr439": (0.9, 8, 0.4, 1000, 1000, 15, 3), # 109721
        "rat783": (0.9, 8, 0.4, 1000, 300, 28, 4), # 9218
        "u1060": (0.9, 8, 0.4, 1000, 350, 8, 10), # 235506
        "fl1577": (0.9, 8, 0.4, 1000, 50, 10, 7), # 23020
    }

    alpha, beta, evap, weight, ants, loops, optruns = params[instance.name]

    # Call C++ program
    cmd = dir + "aco " + str(instance.nPoints) + " " + str(loops) + " " + str(ants) + \
        " " + str(alpha) + " " + str(beta) + " " + str(evap) + " " + str(weight) + \
        " " + str(optruns) + " < " + fname + " &2>/dev/null"
    print(cmd)
    solution = eval(os.popen(cmd).read())
    solution.append(solution[0])
    return solution