如何提取纸浆中的CBC经过时间？

Question

Is there any command to extract the CBC elapsed time with pulp?

With using prob.solve(pulp.PULP_CBC_CMD(msg=True)) we can have the details of the process in the log. But I was wondering if there is any command to extract the elapsed time and write it into a file.

Answer 1

if you do prob.solutionTime you should get the time it took to solve the problem measured by pulp (not necessarily the one reported by CBC but probably close).

A complete example:

from pulp import *
prob = LpProblem("test", const.LpMinimize)
x = LpVariable("x", 0, 4)
y = LpVariable("y", -1, 1)
z = LpVariable("z", 0)
w = LpVariable("w", 0)
prob += x + 4 * y + 9 * z, "obj"
prob += x + y <= 5, "c1"
prob += x + z >= 10, "c2"
prob += -y + z == 7, "c3"
prob += w >= 0, "c4"
prob.solve()
print(prob.solutionTime)

If you want a way to parse the CBC log files, then you could check this library I made that returns a dictionary from a CBC, GUROBI or CPLEX log file: https://github.com/pchtsp/orloge