[BUG] cmaes bfe not working

[dalbabur]

I am trying to compare PSO and CMAES. PSO set_bfe() works as expected, and I see activity across all CPUs when evolving the population. I've tried doing the same with CMAES but the CPUs are not active and the evolution takes way longer. This is with ipyparallel_bfe.

[samimia-swks]

I also see that with both CMAES and NSGAII, using set_bfe() and batch_fitness() makes the algo not converge. I didn't bother to check the CPU activity because it just seems the implementation is broken somehow.