Feature: Nullified hyperparameter (by unused optional steps) to be returnable as keys in a method of class `HyperparamSamples`

[guillaume-chevalier]

We need def HyperparamSamples.get_nullified_keys to remember which hyperparams were nullified by the Optional and ChooseOneOf classes, ChoosManyOf, etc.

hp = step.get_hyperparams()

dict_with_double_underscores = hp.to_flat_dict()

the_keys_of_the_double_underscores_that_were_nullified_this_time = hp.get_nullified_keys()

dict_with_double_underscores.remove(the_keys_of_the_double_underscores_that_were_nullified_this_time)

This is needed for the TPE @alexbrillant @Eric2Hamel

Me or Alex should start this or do this on 11 feb or approx.

[vincent-antaki]

@guillaume-chevalier, I know TPE has been implemented, has this been implemented too?

[guillaume-chevalier]

Not yet! TPE is working but it was also amidst a refactor. @vincent-antaki

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