Gurobi model is stuck not even assigning variables

Awaiting user input

Ishank Gupta

December 02, 2022 03:09

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m = gp.Model('firestations_location')
print('hi')
m.setParam('TimeLimit', 5*60)


X = m.addVars(N, vtype=GRB.BINARY, name='X')
print(1)
F = m.addVars(N,N, vtype=GRB.CONTINUOUS, name='F')
y = m.addVars(N,N, vtype=GRB.BINARY, name='y')
print('hi')
m.addConstrs((1-Y[i]>=X[i] for i in range(N)),name="C1")
m.addConstrs((F[(i,i)]==0 for i in range(N)),name="C2")
m.addConstrs((DIST[(i,j)]-S<=M1*y[(i,j)] for i in range(N) for j in range(N)),name="C3")
m.addConstrs((F[(i,j)]<=M2*(1-y[(i,j)]) for i in range(N) for j in range(N)),name="C4")
m.addConstrs((GRB.quicksum(F[(i,j)]*(C[j]*Y[j]+C_new*X[j])) >= FR[i] for i in range(N) for j in range(N)),name="C5")
print("hi")
obj=GRB.quicksum(X[i] for i in range(N))
m.setObjective(obj,GRB.MINIMIZE)

(MODEL IN JUPYTER NOTEBOOK)

I tried debugging by understanding where it might have stucked, but its not working. Any idea on how to understand where the issue might be. Similar problem on small data worked in AMPL, so I am thinking there might be some syntax issue. Please advise!

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• Python

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  Jaromił Najman

  • Gurobi Staff

  December 05, 2022 09:17

  Your code snippet is not reproducible. There are multiple definition missing, e.g., \(\texttt{N, Y, DIST, S, M1, C, C_new, FR}\)

  Could you please generate a minimal reproducible example?

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