🐛 Bug Report

If you try to run experiment in system/docker container where missing git (in system) your code will crush at this line:

https://github.com/catalyst-team/catalyst/blob/master/catalyst/utils/pipelines.py#L4

with message like this:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/git/__init__.py", line 83, in <module>
    refresh()

According to @rspadim, functions in entropy.py could use numpy array instead of strings, as it's better to numba.

Guide on how to implement this is available in the comments in PR #311 .

🙋 Feature Request

🔦 Context

Feature description
The build script currently uncompresses the dependencies, even when they have already been uncompressed. This isn't so bad for HElib and NTL but boost takes an appreciable time to uncompress. The build script should do something to check that if the directory is there, and if it is don't uncompress.

Acceptance criteria

1. Build script should not uncompress depend

Self-explanatory.