backend tensor

[guanqin-123]

• Add sequential MCTS subproblem selection - MCTSBounding with ancestor-propagated visit
• Add diverse tensor subproblem processing - consolidated the diversity pool into a single diverse strategy

[codecov]

Codecov Report

❌ Patch coverage is 61.48867% with 119 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.61%. Comparing base (df5bdf4) to head (bfaa02b).

Files with missing lines	Patch %	Lines
act/back_end/bab/branching/bounding.py	57.55%	118 Missing ⚠️
act/back_end/bab/bab.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
+ Coverage   73.53%   73.61%   +0.08%     
==========================================
  Files          91       91              
  Lines       20508    20800     +292     
==========================================
+ Hits        15080    15312     +232     
- Misses       5428     5488      +60     

Flag	Coverage Δ
bab	50.39% <61.48%> (+4.67%)	⬆️
backend-float32	48.84% <1.94%> (-0.71%)	⬇️
backend-float64	48.88% <1.94%> (-0.68%)	⬇️
frontend	32.47% <1.94%> (-0.45%)	⬇️
pipeline-fuzz	20.25% <1.94%> (-0.27%)	⬇️
pipeline-verify	39.07% <13.26%> (-0.41%)	⬇️

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

Files with missing lines	Coverage Δ
act/back_end/bab/branching/__init__.py	100.00% <ø> (ø)
act/config/config.py	90.77% <100.00%> (+1.35%)	⬆️
act/back_end/bab/bab.py	72.65% <96.00%> (-0.27%)	⬇️
act/back_end/bab/branching/bounding.py	69.76% <57.55%> (-17.61%)	⬇️

... and 5 files with indirect coverage changes

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