remove the support of old style input

[wanghan-iapcm]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ebe7a17) 87.44% compared to head (fdb15b2) 87.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   87.44%   87.57%   +0.12%     
==========================================
  Files          82       82              
  Lines        4173     4160      -13     
==========================================
- Hits         3649     3643       -6     
+ Misses        524      517       -7     

Files	Coverage Δ
dpgen2/entrypoint/args.py	91.47% <ø> (-0.07%)	⬇️
dpgen2/entrypoint/main.py	54.05% <ø> (-0.82%)	⬇️
dpgen2/entrypoint/submit.py	70.41% <97.22%> (+1.45%)	⬆️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.