[ahmadtabikh]

Adds a Particle Transformer (ParT) b-jet tagger to jetTaggerHF, alongside the existing GNN tagger. It writes its D_b score to the same scoreML / tagging tables.

1. jetTaggerHF.cxx: new `processAlgorithmParT (data and MCD, off by default) and a part ConfigurableGroup (nConstit, nFeat, nVec, padWrap, minTracks). The model is loaded from CCDB or from a local file.
2. JetTaggingUtilities.h: analyzeJetTrackInfo4ParT() builds the 10 per-constituent features and the 4-vector. getDbFromProb() computes D_b directly from the probabilities, with no softmax since the exported model already applies it.
3. MlResponseHfTagging.h: ParTBjetAllocator reproduces the input preparation of weaver (the framework used to train the ParT model): pf_features (1, nFeat, nConstit), pf_vectors (1, nVec, nConstit) and pf_mask (1, 1, nConstit), with truncation at nConstit, wrap or zero padding (mask 0 on padded slots), and non-finite values set to 0. getModelOutputMultiInput() evaluates models with several input tensors.
   ParT_O2_pipeline_colored.pdf

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 38 warnings, 🔕 7 disabled

[nzardosh]

doesnt this always take the model in the first pT bin? is it intended?

[ahmadtabikh]

The ParT model is trained inclusively in pT, so a single bin (binsPtMl = {5, 1000}) is the intended setup. That's why I hard-coded the model index to 0, following the existing GNN implementation, which uses the same approach.

[alibuild]

Error while checking build/O2Physics/code-check for 6d3e25c at 2026-10-26 16:37:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'To reproduce the results below locally, run: '\''aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'\''.'
To reproduce the results below locally, run: 'aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'.
++ echo 'To apply all automatic fixes, add the '\''-e O2PHYSICS_CHECKER_FIX=1'\'' option.'
To apply all automatic fixes, add the '-e O2PHYSICS_CHECKER_FIX=1' option.
++ echo 'See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.'
See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.
++ echo 'Found 2 errors and 84 warnings.'
Found 2 errors and 84 warnings.
++ [[ 2 -gt 0 ]]
++ cat /sw/BUILD/889622c776b50fe71b6cb42e02845b7e0fa15cbd/O2Physics-code-check/errors.txt
PWGJE/Core/MlResponseHfTagging.h:417:9: error: 'push_back' is called inside a loop; consider pre-allocating the container capacity before the loop [performance-inefficient-vector-operation,-warnings-as-errors]
PWGJE/DataModel/Jet.h:181:1: error: Called C++ object pointer is null [clang-analyzer-core.CallAndMessage,-warnings-as-errors]
++ [[ 84 -gt 0 ]]
++ cat /sw/BUILD/889622c776b50fe71b6cb42e02845b7e0fa15cbd/O2Physics-code-check/warnings.txt
PWGJE/Core/JetTaggingUtilities.h:235:5: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:294:9: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:331:9: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:403:11: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:438:11: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:449:5: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:475:11: warning: do not use 'else' after 'return' [readability-else-after-return]
PWGJE/Core/JetTaggingUtilities.h:495:47: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:497:45: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:508:41: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:510:41: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:512:58: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:514:58: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:518:55: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:521:53: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:533:41: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:534:12: warning: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr]
PWGJE/Core/JetTaggingUtilities.h:550:29: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:563:69: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:566:11: warning: variable 'varSignImpSig' is not initialized [cppcoreguidelines-init-variables]
PWGJE/Core/JetTaggingUtilities.h:589:7: warning: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty]
PWGJE/Core/JetTaggingUtilities.h:644:42: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:676:69: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:689:30: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:709:69: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:738:30: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:754:15: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:759:120: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:781:61: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:783:8: warning: narrowing conversion from 'float' to 'bool' [bugprone-narrowing-conversions]
PWGJE/Core/JetTaggingUtilities.h:785:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Core/JetTaggingUtilities.h:789:33: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.