>From the example in the documentation:

# specify parameters and distributions to sample from
param_dist = {"max_depth": [3, None],
              "max_features": sp_randint(1, 11),
              "min_samples_split": sp_randint(1, 11),
              "min_samples_leaf": sp_randint(1, 11),
              "bootstrap": [True, False],
              "criterion": ["gini", "entropy"]}

what does None do for max_depth?
In particular, if lists are provided, does randomized grid search construct a 
uniform probability distribution? If that's the case, I presume there is no 
advantage over GridSearchCV?

Thank you,

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