MNT add rng seed for profile-narx

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: MNT add rng seed for profile-narx #158
• A description of the changes:

1. add rng seed for profile-narx
2. remove unused n_threads

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (48cc650) to head (2df3251).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #159   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          599       597    -2     
=========================================
- Hits           599       597    -2     

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