Pickle compatibility is not given between pickle and cloudpickle => GitHub Action crash

[Anselmoo]

🐛🐛 Bug Report

⚗️ Current Behavior

By activating the pytest environment of GirHub Actions - package.yml, a compatibility problem shows up, as a result of incompatibility in the pickle protocols. The consequence is the CI test is crashed!

1. https://github.com/Anselmoo/Hub/runs/2374960592?check_suite_focus=true

https://github.com/activeloopai/Hub/blob/f19d5663bbb79d8159121dbf4794d8ac6b4e3fcf/hub/api/tests/test_dataset.py#L179-L180

⚙️ Environment

• Python Version [3.6-3.8]
• OS[UNIX, Linux, Windows]

🔭 First Results

Every python version except the combination Windows + Python 3.8 needs Pickle5, vice versa, default pickle can be used

🧰 Possible Solution (optional)

1. Removed cloudpickle and only use pickle.dumb and pickle.loud
2. Working case sensitive

[mynameisvinn]

@Anselmoo this seems like an easy fix. Since a Dataset is easily serializable I am not sure why cloudpickle was used in the first place. Can you submit a PR and I will merge?

[Anselmoo]

@mynameisvinn A fix of this issue is included in the PR #780 as part of the update of the GitHub Action pipeline. However, I can separate it.

[mynameisvinn]

@Anselmoo mind separating the PRs? It will served as future documentation on the decision between pickle and cloudpickle :)

Submit PR and I'll merge!

[Anselmoo]

@mynameisvinn there is one more cloudpickle in the following test below

https://github.com/activeloopai/Hub/blob/27483e6c8dc2d45b4efcc478a6cdfbe6d2e0d532/hub/store/tests/test_s3_storage.py#L43-L47

If that is not necessary, we can completely remove it, even from the https://github.com/activeloopai/Hub/blob/master/requirements-dev.txt