Pipinstall could be used instead of nroot:
https://github.com/GoogleCloudPlatform/ramble/tree/develop/var/ramble/repos/builtin/applications/py-cosmoflow

Demo of how to use pip (but not a useful benchmark):
https://github.com/GoogleCloudPlatform/ramble/tree/develop/var/ramble/repos/builtin/applications/pip-test