I have defined a regressor as follows:

```
nn1 = Regressor(
layers=[
    Layer("Rectifier", units=150),
    Layer("Rectifier", units=100),
    Layer("Linear")],
regularize="L2",
# dropout_rate=0.25,
learning_rate=0.01,
valid_size=0.1,
learning_rule="adagrad",
verbose=False,
weight_decay=0.00030,
n_stable=10,
f_stable=0.00010,
n_iter=200)

```

I am using this regressor in a k-fold cross-validation. In order for cross-validation to work properly and not learn from the previous folds, it's necessary that the regressor to be reset after each fold.  

How can I reset the regressor object?