Answers for "how to upgrade scikit learn in jupyter notebook"

sklearn version

import nltk
import sklearn

print('The nltk version is {}.'.format(nltk.__version__))
print('The scikit-learn version is {}.'.format(sklearn.__version__))

# The nltk version is 3.0.0.
# The scikit-learn version is 0.15.2.

conda install sklearn 0.20

conda install scikit-learn=0.20