update hyperparameters

[YiwenAI]

Description

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have ensured make test pass (required).
• I have checked the code using make commit-checks (required).

[codecov]

Codecov Report

Merging #113 (4c51fcd) into main (4c20350) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
- Coverage   45.39%   45.31%   -0.08%     
==========================================
  Files         147      147              
  Lines        9217     9233      +16     
==========================================
  Hits         4184     4184              
- Misses       5033     5049      +16     

Flag	Coverage Δ
unittests	45.31% <0.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
openrl/drivers/offpolicy_driver.py	19.76% <0.00%> (-4.52%)	⬇️

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