NevergradRuntimeWarning: Bounds are 1.0 sigma away from each other at the closest, you should aim for at least 3 for better quality. errors.NevergradRuntimeWarning,

[xinhongri]

Steps to reproduce

1. ng.p.Array(init=np.array([0.5,0.5,0.5]),).set_bounds(0, 1)

why does it happen?
how to solve?

[jrapin]

Hi @xinhongri
The default sigma/step size is 1, but the range of your bounds is 1 - 0 = 1, so that you're pretty sure to hit the bounds rather quickly. Either:

• change sigma manually ng.p.Array(init=np.array([0.5,0.5,0.5]),).set_mutation(sigma=0.25).set_bounds(0, 1)
• set bounds within the constructor so that sigma is initialized automatically with a good value: ng.p.Array(lower=0, upper=1, shape=(3,)) (the default init value will be the middle so it's simpler to just provide the shape in this case)