I followed http://nilearn.github.io/introduction.html.
Took a loooong time and then some bogus errors. When importing it in jupyter notebook, it complaisn about TypeError: object of type “NoneType” has no len() out of nowhere.
I am wondering if something specific to jeyson nano needs to be considered when installing nilearn.
It basically needs scipy, sklearn and numpy + nibabel.
UPDATE: That link above installs nilearn perfect. All needs to be done to successfully import ni learn is to update pytest: pip3 install pytest==5.2.0
And recycle the Kernel.