Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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TODO 10
Now it's your turn to define an entire class. Complete the TODO by creating the LogTransformer class.
- Define the LogTransformer class by following the below steps:
- Create a class called LogTransformer. Make sure this class inherits BaseEstimator and TransformerMixin.
- Note: as we don't need the constructor method __init__() we don't have to define it.
- Define the fit() method. Be sure it takes the arguments self, X, and y=None just like we did above. Further, make sure to return self otherwise you will get errors.
- Define the transform() method which takes the arguments self, X, and y=None just like we did above.
- In the transform() method, return the log of the input data X. Be sure you add 1 to the data before computing the log as it is not possible to take ???(0)!
- Create a class called LogTransformer. Make sure this class inherits BaseEstimator and TransformerMixin.
# TODO 10.1
log = LogTransformer()
log_area_df = log.fit_transform(forestfire_df['area'])
display(log_area_df)
todo_check([
(log_area_df.shape == (517,), 'log_area_df does not have the shape (517,)'),
(np.all(np.isclose(log_area_df.values[-5:], np.array([2.00687085, 4.01259206, 2.49815188, 0. , 0. ]),rtol=.01)), 'log_area_df did not contain the correct values!')
])
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