Wrong Riesz representation in the IPOPTSolver in Firedrake

[diego-hayashi]

Due the commit firedrakeproject/firedrake@af2c9cc (Firedrake), the default Riesz representation changed from l2 to L2. This breaks the IPOPTSolver in Firedrake, since IPOPT is not prepared for anything other than l2.

One possible solution to this would be to specify the Riesz representation directly in the IPOPTSolver, as:

dJ = partial(self.rfn.derivative, forget=False, options={"riesz_representation": 'l2'})

[dham]

When you say "breaks" IPopt, what do you mean?

[diego-hayashi]

IPOPT is still not ready for L2, and previous results are not reproducible the same way as before.