Unable to retrieve loss for Parametrized CMA

[gauravmanmode]

Issue description:

recommendation.loss is not available when running optimization with Parametrized CMA. Am I missing something?

MRE

#with minimize
import nevergrad as ng
import numpy as np
def square(x):
return x@x
instrum = ng.p.Instrumentation(ng.p.Array(shape=(2,)))
optimizer = ng.optimizers.ParametrizedCMA() (parametrization=instrum, budget=100)
recommendation = optimizer.minimize(square)
print (recommendation. Loss)

Returns None

# with ask-and-tell]
for _ in range (optimizer. budget):
x = optimizer.ask()
loss = square(*x.args, **x.kwargs)
optimizer.tell(x, loss)
recommendation = optimizer.provide_reconnendation()
print (recommendation. loss)

Returns None

Realted to:
#703