Fix tilde in dataset path

[DRosen766]

This PR corresponds to this issue: Improper Dataset Extraction when Tilde In path #295

Previously, if a tilde existed in the path passed to a dataset for saving/extraction, the dataset would not be able to recognize the location to extract after downloading. This is because the function os.path.expanduser was only run during extraction here

but nowhere during loading.

To fix this, I added a call to os.path.expanduser in the Dataset class's init

I also added a global variable to the dataset_utils test to make changing the test directory easier and made a call to the os.path.expanduser function so it can be assigned to a tilde path and still work.

All the tests work on my end locally, lmk if they fail anywhere else or if something is missing.

Also, in order to run CICD successfully, I had to update the pytorch requirements.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.49%. Comparing base (a4e8a45) to head (30d993b).
Report is 72 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #296      +/-   ##
===========================================
+ Coverage    77.07%   77.49%   +0.42%     
===========================================
  Files           54       55       +1     
  Lines         3067     3231     +164     
===========================================
+ Hits          2364     2504     +140     
- Misses         703      727      +24     

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