sklearn NBClassifier got an unexpected keyword argument 'var_smoothing'

Question

I am replying this example in my code:

import numpy as np
X = np.array([[-1, -1], [-2, -1], [-3, -2], [1, 1], [2, 1], [3, 2]])
Y = np.array([1, 1, 1, 2, 2, 2])
from sklearn.naive_bayes import GaussianNB
clf = GaussianNB()
clf.fit(X, Y)
GaussianNB(priors=None, var_smoothing=1e-09)
print(clf.predict([[-0.8, -1]]))

which is presented here: GaussianNB documentation.

I get

GaussianNB(priors=None, var_smoothing=1e-09)
TypeError: __init__() got an unexpected keyword argument 'var_smoothing'

The version of sklearn is

>>> import sklearn
>>> print(sklearn.__version__)
0.19.2

Does anybody know what is happening and how to solve it?

Answer 1

The current version of sci-kit learn is 0.21.2.

I tested this out in sklearn version 0.19.2. The parameter var_smoothing is not defined for the GaussianNB method.

You can check this out by using the documentation

from sklearn.naive_bayes import GaussianNB
help(GaussianNB)

# Result
Help on class GaussianNB in module sklearn.naive_bayes:

class GaussianNB(BaseNB)
 |  Gaussian Naive Bayes (GaussianNB)
...
...
 |  Parameters
 |  ----------
 |  priors : array-like, shape (n_classes,)
 |      Prior probabilities of the classes. If specified the priors are not
 |      adjusted according to the data.
 |  
 |  Attributes
...
...

You can upgrade to the latest version of scikit learn or just remove the parameter.