Runtime warning

[robynstuart]

From running benchmark_empowerment.py:

/Users/robynstuart/anaconda3/envs/starsim/lib/python3.9/site-packages/numpy/lib/arraysetops.py:733: FutureWarning: elementwise comparison failed; returning scalar instead, but in the future will perform elementwise comparison
  mask |= (ar1 == a)
/Users/robynstuart/Documents/git/fpsim/fpsim/sim.py:391: RuntimeWarning: invalid value encountered in scalar divide
  self.results['mcpr'][ti] = r.on_methods_mcpr / (r.no_methods_mcpr + r.on_methods_mcpr)
/Users/robynstuart/Documents/git/fpsim/fpsim/sim.py:393: RuntimeWarning: invalid value encountered in scalar divide
  self.results['acpr'][ti] = r.on_methods_acpr / (r.no_methods_acpr + r.on_methods_acpr)

The last two must be because the result arrays aren't populated, but the first is mysterious to me - where is it coming from? This also occurs when running test_simple() within test_sim.py.