`generate_code` raises IndexError when `solver="CLARABEL"`

[Kunal Menda]

Hello, I'm trying to use cvxpygen but running into an error when I try using CLARABEL as a solver.

Minimal example

import cvxpy as cp
from cvxpygen import cpg
import numpy as np

# define CVXPY problem
m, n = 3, 2
x = cp.Variable(n, name='x')
A = cp.Parameter((m, n), name='A', sparsity=[(0, 0), (0, 1), (1, 1)])
b = cp.Parameter(m, name='b')
problem = cp.Problem(cp.Minimize(cp.sum_squares(A @ x - b)), [x >= 0])

# assign parameter values and test-solve
np.random.seed(0)
A.value = np.zeros((m, n))
A.value[0, 0] = np.random.randn()
A.value[0, 1] = np.random.randn()
A.value[1, 1] = np.random.randn()
b.value = np.random.randn(m)
problem.solve(solver='CLARABEL')

# generate code
cpg.generate_code(problem, code_dir='nonneg_LS', solver='CLARABEL')

Output

Generating code with CVXPYgen ...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/kunalmenda/anaconda3/envs/test/lib/python3.10/site-packages/cvxpygen/cpg.py", line 155, in generate_code
    for dual_id in dual_id_maps[0].keys():
IndexError: list index out of range

Is there any way to avoid this error?

Thanks,
Kunal

[Parth Nobel]

Hey Kunal,

We don't support Clarabel in CVXPYgen yet. That work can't really start till #24 is done I think.

[Maximilian Schaller]

Hi @kunalmenda, you can use Clarabel now if you are a Mac or Linux user. See #28. Feel free to install from sources by cloning the repo via git clone --recurse-submodules https://github.com/cvxgrp/cvxpygen.git and installing via python setup.py install. You will need Rust and Eigen (more info here).