[ENH][REF] Torch Scoreboard

[tallyhawley]

Description

Adds a PyTorch backend/engine for the cortex ScoreboardModel. This backend can be selected by passing the argument engine='torch' during model initialization.

Closes #611

Type of Change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Attention: Patch coverage is 37.83784% with 23 lines in your changes are missing coverage. Please review.

Please upload report for BASE (torch@180b83b). Learn more about missing BASE report.

❗ Current head 0bead62 differs from pull request most recent head b472344

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Files	Patch %	Lines
pulse2percept/models/cortex/base.py	37.83%	23 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             torch     #612   +/-   ##
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  Coverage         ?   92.01%           
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  Files            ?      128           
  Lines            ?    11515           
  Branches         ?        0           
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  Hits             ?    10596           
  Misses           ?      919           
  Partials         ?        0           

Flag	Coverage Δ
unittests	92.01% <37.83%> (?)

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