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End to End ML Project - Creating custom transformer

Now we will create a custom transformer to combine the attributes that we created earlier.

  • First we will import BaseEstimator, and TransformerMixin classes from sklearn

    from sklearn.base import BaseEstimator, TransformerMixin
  • Now, copy paste the code given below as is

    rooms_ix, bedrooms_ix, population_ix, households_ix = 3, 4, 5, 6
    class CombinedAttributesAdder(BaseEstimator, TransformerMixin):
        def __init__(self, add_bedrooms_per_room=True):
            self.add_bedrooms_per_room = add_bedrooms_per_room
        def fit(self, X, y=None):
            return self
        def transform(self, X):
            rooms_per_household = X[:, rooms_ix] / X[:, households_ix]
            population_per_household = X[:, population_ix] / X[:, households_ix]
            if self.add_bedrooms_per_room:
                bedrooms_per_room = X[:, bedrooms_ix] / X[:, rooms_ix]
                return np.c_[X, rooms_per_household, population_per_household,
                return np.c_[X, rooms_per_household, population_per_household]
    attr_adder = CombinedAttributesAdder(add_bedrooms_per_room=False)
    housing_extra_attribs = attr_adder.transform(housing.values)

    In this example the transformer has one hyperparameter, add_bedrooms_per_room, set to True by default (it is often helpful to provide sensible defaults). This hyperparameter will allow you to easily find out whether adding this attribute helps the Machine Learning algorithms or not.

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