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Even if NLPL strives to make available a comprehensive set of ready-to-run sofware modules, users will at times want to install their own add-on components.

Python Virtual Environments on Saga

NLPL software modules that provide add-on components to Python are implemented as stacked virtual environments. This design requires that some care is taken when creating user-level virtual environments; most importantly, the correct base Python version needs to be used when creating and manipulating the virtual environment:

module purge; module load Python/3.7.2-GCCcore-8.2.0
python3 -m virtualenv foo
. foo/bin/activate
python3 -m pip install telegram

It is recommend to use python3 -m virtualenv and the like instead of short-hand commands like virtualenv or pip, because this gives better control over exactly which Python interpreter is used. For the above, for example, the following must hold (in late 2019):

type -path python3

Once the virtual environment is fully loaded, it can be combined with NLPL modules, e.g.

module load nlpl-tensorflow/1.15.0/3.7 nlpl-horovod/0.18.2/3.7
. foo/bin/activate
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