An error from the dynamic set
Answered
I want to apply dynamically add decision variables and constraints to my model. But I get a key error from static set. I don't understand what is the problem. Any help will be appreciated.
Error:
Traceback (most recent call last):
File "d:\Github\docentlik_jcp\lagr_cutgen_dual_v1.py", line 468, in <module>
res, soltime=lagrange(pval,prod,7200, S)
File "d:\Github\docentlik_jcp\lagr_cutgen_dual_v1.py", line 355, in lagrange
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1)
File "d:\Github\docentlik_jcp\lagr_cutgen_dual_v1.py", line 355, in <genexpr>
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1)
KeyError: (0, 1, 0, 0)
The code part can cause this problem is:
for iter in tqdm(range(max_iter)):
z_dual={}
for s in range(S):
for i in range(n):
for t in range(1,T):
z_dual[i,t,s,iter] = rmpd.addVar(vtype=GRB.CONTINUOUS, lb=0, name="z_dual%s.%s.%s.%s" % (i,t,s,iter))
rmpd_iter1={}
#RMP constraints
for s in range(S):
for i in range(n):
for t in range(1,T):
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1)
-
Hi Nazmi,
KeyError: (0, 1, 0, 0) comes from python dict. It seems that the key (0, 1, 0, 0) does not exist in z_dual. You can run print(z_dual.keys()) and check what the keys of this dict. I suspect that the place in which z_dual is defined is wrong.
Thanks,
Ryuta1 -
Hi Ryuta,
I don't understand but this problem is vanished after adding print(z_dual.keys()) command. However, after get rid of this warning from the first iteration it again appears in the second iteration. I do not think the error is caused by the placement. The end of the each iteration I remove this constraint set, and I define the beginning of the each iteration with new decision variables. I appreciate your helps. Thank you for your helps,
Current form of error:0%| | 1/2000 [00:03<1:51:51, 3.36s/it]
Traceback (most recent call last):
File "d:\Github\docentlik_jcp\lagr_cutgen_dual_v1.py", line 479, in <module>
res, soltime=lagrange(pval,prod,7200, S)
File "d:\Github\docentlik_jcp\lagr_cutgen_dual_v1.py", line 357, in lagrange
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1, name=f"rmpd1_{s}_{i}_{t}")
File "d:\Github\docentlik_jcp\lagr_cutgen_dual_v1.py", line 357, in <genexpr>
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1, name=f"rmpd1_{s}_{i}_{t}")
KeyError: (0, 1, 0, 0)Source of error:for iter in tqdm(range(max_iter)):
z_dual={}
for s in range(S):
for i in range(n):
for t in range(1,T):
z_dual[i,t,s,iter] = rmpd.addVar(vtype=GRB.CONTINUOUS, lb=0, name="z_dual%s.%s.%s.%s" % (i,t,s,iter))
rmpd.update()
rmpd_iter1={}
#RMP constraints
for s in range(S):
for i in range(n):
for t in range(1,T):
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1, name=f"rmpd1_{s}_{i}_{t}")
rmpd_iter2={}
#RMP constraints
for i in range(n):
for t in range(1,T):
rmpd_iter2[i,t]=rmpd.addConstr(gp.quicksum(z_dual[i,t,s,iters]*x_val[i,t,s,iter] for iters in range(iter+1) for s in range(S))==cg_bar[i,t], name=f"rmpd2_{i}_{t}")
rmpd_obj=sum(objval[iters]*z_dual[i,t,s,iters] for i in range (n) for t in range(1,T) for s in range(S) for iters in range(iter+1))
rmpd.setObjective(rmpd_obj, GRB.MINIMIZE)0 -
Hi,
If I understand correctly, "z_dual" is redefined each time inside the loop of "for iter in tqdm(range(max_iter)):". In that case, the fourth index of z_dual is only "iter" each time. However, the part of error refers as the following:
rmpd_iter1[i,t,s]=rmpd.addConstr(sum(z_dual[i,t,s,iters] for iters in range(iter+1))==1, name=f"rmpd1_{s}_{i}_{t}")In the second iteration, the fourth index of z_dual is only "iter"=1, but "iters" will be 0 and 1. The key "iter"=0 doed not exist, therefore KeyError occurs.
Thanks
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