cvxopt 1.2.0 bug about polytope HOT 5 CLOSED

I reproduced the error locally, and now I am investigating.

from polytope.

My hypothesis is that version 1.2.0 of cvxopt has a bug in its handling of solver options when provided as an argument to the solver-specific lp function, which is a new feature in version 1.2.0 of cvxopt. I am trying to make a minimal demonstrating example, but meanwhile, a workaround is

diff --git a/polytope/solvers.py b/polytope/solvers.py
index fa9e71a..97e02e0 100644
--- a/polytope/solvers.py
+++ b/polytope/solvers.py
@@ -40,7 +40,7 @@ try:
     installed_solvers.add('glpk')
     # Hide optimizer output
     cvx.solvers.options['show_progress'] = False
-    cvx.solvers.options['glpk'] = dict(msg_lev='GLP_MSG_OFF')
+    cvx.glpk.options['msg_lev'] = 'GLP_MSG_OFF'
 except ImportError:
     logger.warn(
         '`polytope` failed to import `cvxopt.glpk`.')

from polytope.

I created a bug report at cvxopt/cvxopt#120

from polytope.

To avoid having to wait on upstream to accept the bug report etc., I recommend that we change our usage as shown above.

@necozay @johnyf thoughts?

from polytope.

from polytope.