fix: fix cuda initialization error in experiment grid

[Gaiejj]

Description

Modify the multi-process context to default fork to spawn.

Motivation and Context

close #314

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Types of changes

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

Checklist

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• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly. (required for a bug fix or a new feature)
• I have updated the documentation accordingly.
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• I have ensured make test pass. (required)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.57%. Comparing base (efe7d9c) to head (a88325e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
+ Coverage   96.56%   96.57%   +0.01%     
==========================================
  Files         139      139              
  Lines        7089     7090       +1     
==========================================
+ Hits         6845     6847       +2     
+ Misses        244      243       -1     

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