I was thinking about this.

``` python
param_grid = {"max_depth": range(1, 5),
              "max_features": range(1, 4),
              "min_samples_split": range(1, 5),
              "min_samples_leaf": range(1, 5),
              "bootstrap": [True, False], 
              "criterion": ["gini",  "entropy"]}
```

But ok,  do as you want.