CODEWITHSUNDEEP
python-3.xattributeerrorcplexcvxpy
Edmund Blackadder
Edmund Blackadder

Reputation: 17

CVXPY and CPLEX - What is this attribute error about?

I am trying to solve the Unit Commitment Problem (Mixed Integer Quadratic Programming problem) using the CVXPY framework for modelling the problem and CPLEX for solving the problem.

When I run my code I get an AttributeError: 'Problem' object has no attribute '_compute_once_is_mixed_integer'

And this is the error I mainly get:

AttributeError: 'Problem' object has no attribute '_compute_once_is_mixed_integer'

Upvotes: 0

Views: 1058

Answers (1)

rkersh
rkersh

Reputation: 4465

This doesn't appear to be a CPLEX-specific problem. A similar cvxpy issue was reported in github here. In short:

The stack trace makes it seem like the issue is with your code, not CVXPY. In particular, it indicates that one of your constraints in constrlist is a NumPy object.

If you comment out the following constraint:

# Spinning Reserve Constraint
sum(isOn[:, k] * P_MAX) >= Load[k] + SR[k]

Then, the solve is successful.

Upvotes: 1

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