[tmva] Deprecate PyMVA and the tmva-pymva build option - #23260
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guitargeek
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lmoneta
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September 4, 2026 14:29
dpiparo
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Sep 4, 2026
PyMVA, the set of TMVA method plugins backed by Python machine-learning libraries (PyKeras, PyTorch, PyRandomForest, PyGTB and PyAdaBoost), is deprecated and scheduled for removal in ROOT 6.44. Like the SOFIE Keras and PyTorch parsers that are removed in this release cycle, PyMVA relies on implementation details of the underlying Python libraries that change faster than is appropriate for ROOT's stability standards. Users are encouraged to train and evaluate their models directly with the Python machine-learning libraries, which integrate well with the ROOT Python interface. For high-performance inference in C++, models can be exported to ONNX and evaluated with SOFIE. Besides the configure-time CMake deprecation warning, a runtime warning is emitted whenever a PyMVA method is constructed: PyMVA users typically consume ROOT as a pre-built binary (LCG, conda), so they would never see the configure-time message.
Test Results 23 files 23 suites 3d 19h 33m 3s ⏱️ For more details on these failures, see this check. Results for commit 7e60014. |
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PyMVA, the set of TMVA method plugins backed by Python machine-learning libraries (PyKeras, PyTorch, PyRandomForest, PyGTB and PyAdaBoost), is deprecated and scheduled for removal in ROOT 6.44.
Like the SOFIE Keras and PyTorch parsers that are removed in this release cycle, PyMVA relies on implementation details of the underlying Python libraries that change faster than is appropriate for ROOT's stability standards.
Users are encouraged to train and evaluate their models directly with the Python machine-learning libraries, which integrate well with the ROOT Python interface. For high-performance inference in C++, models can be exported to ONNX and evaluated with SOFIE.
Besides the configure-time CMake deprecation warning, a runtime warning is emitted whenever a PyMVA method is constructed: PyMVA users typically consume ROOT as a pre-built binary (LCG, conda), so they would never see the configure-time message.