Fix negative sampler config

[spirinamayya]

Fixed negative sampler kwargs in transformer model config

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9b3992e) to head (660594c).
Report is 113 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #278     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           45        78     +33     
  Lines         2242      5274   +3032     
===========================================
+ Hits          2242      5274   +3032     

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