As seen here, sklearn.datasets.fetch_mldata has been deprecated as of version 0.20 and will be removed from sklearn in version 0.22 since the source website mldata.org went down as of March last year.
This means that the final section "Example: Visualizing Structure in Digits" of the Manifold Learning chapter is not reproducible:
from sklearn.datasets import fetch_mldata
mnist = fetch_mldata('MNIST original')
As seen here,
sklearn.datasets.fetch_mldata
has been deprecated as of version 0.20 and will be removed from sklearn in version 0.22 since the source website mldata.org went down as of March last year.This means that the final section "Example: Visualizing Structure in Digits" of the Manifold Learning chapter is not reproducible: