deepmodeling/abacus-develop
Nov 2024 – Mar 2026
15 Months active
Languages Used
C++CMakeMakefileShellMarkdownPythonCYAML
Technical Skills
C++C++ DevelopmentC++ developmentCode DocumentationCode FormattingCode Refactoring
Mohan Chen
PROFILE
Mohan Chen
Mohan Chen contributed to the deepmodeling/abacus-develop repository by modernizing and refactoring core modules for electronic structure calculations, focusing on maintainability and scalability. He unified output systems, modularized density matrix and DFT+U handling, and enhanced initialization paths to support LCAO and OFDFT workflows. Using C++ and Fortran, Mohan improved code organization, introduced robust error handling, and standardized file naming conventions, which increased reproducibility and reduced technical debt. His work included optimizing build systems with CMake, expanding test coverage, and preparing the codebase for GPU and CI/CD integration. These efforts enabled more reliable simulations and streamlined future development across the project.
Overall Statistics
Feature vs Bugs
91%Features
Repository Contributions
107Total
Bugs
3
Commits
107
Features
30
Lines of code
155,111
Activity Months15
Your Network
47 peopleWork History
March 2026
11 Commits • 2 Features
Mar 1, 2026March 2026 — Delivered foundational ESolver modernization for ABACUS: removed template parameters from ESolver, modularized DeltaSpin and DFT+U, and tightened CI/CD compatibility. Implemented DeltaSpin refactor for LCAO with a dedicated deltaspin_lcao module (init_deltaspin_lcao, cal_mi_lcao_wrapper, run_deltaspin_lambda_loop_lcao) and a guard for sc_mag_switch to prevent uninitialized atomCounts. Created DFT+U module for LCAO (init_dftu_lcao, finish_dftu_lcao) to unify old/new implementations. Extracted diagonalization parameter setup to dedicated hsolver modules for PW and SDFT (diago_params_pw, diago_params_sdft) to improve maintainability. Introduced architectural refinements (HamiltBase, static_cast p_hamilt, and conditional compilation) to reduce template complexity and improve build reliability. Added ABACUS Output Specifications documentation to standardize output naming and formats. These changes improve business value by enabling faster iterations, safer refactors, and more predictable CI results while preserving feature parity and performance.
11 Commits • 2 Features
Mar 1, 2026March 2026 — Delivered foundational ESolver modernization for ABACUS: removed template parameters from ESolver, modularized DeltaSpin and DFT+U, and tightened CI/CD compatibility. Implemented DeltaSpin refactor for LCAO with a dedicated deltaspin_lcao module (init_deltaspin_lcao, cal_mi_lcao_wrapper, run_deltaspin_lambda_loop_lcao) and a guard for sc_mag_switch to prevent uninitialized atomCounts. Created DFT+U module for LCAO (init_dftu_lcao, finish_dftu_lcao) to unify old/new implementations. Extracted diagonalization parameter setup to dedicated hsolver modules for PW and SDFT (diago_params_pw, diago_params_sdft) to improve maintainability. Introduced architectural refinements (HamiltBase, static_cast p_hamilt, and conditional compilation) to reduce template complexity and improve build reliability. Added ABACUS Output Specifications documentation to standardize output naming and formats. These changes improve business value by enabling faster iterations, safer refactors, and more predictable CI results while preserving feature parity and performance.
March 2026
February 2026
6 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for deepmodeling/abacus-develop: Codebase modernization, interoperability improvements, and analytics output refinements were delivered. The month focused on modularizing core subsystems, establishing interfaces for ABACUS integration, and tightening build/CI/CD reliability to support faster iteration and integration readiness.
February 2026
6 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for deepmodeling/abacus-develop: Codebase modernization, interoperability improvements, and analytics output refinements were delivered. The month focused on modularizing core subsystems, establishing interfaces for ABACUS integration, and tightening build/CI/CD reliability to support faster iteration and integration readiness.
January 2026
9 Commits • 2 Features
Jan 1, 2026January 2026 (Month: 2026-01) focused on strengthening numerical robustness, expanding test coverage for LCAO gamma-only calculations, and refactoring for modularity to support CUDA/ROCm. Key outcomes include adding gamma-only LCAO tests with MD indexing starting from 1 and updating a broad set of examples, hardening initialization across core components to eliminate uninitialized variables, and reorganizing the pw module and timer functionality to improve maintainability and scalability. These efforts reduce the risk of incorrect MD steps, increase reliability of simulations, and position the codebase for easier future GPU adaptations. The work also involved build-system and CI/CD readiness improvements to support smoother integration and deployment.
9 Commits • 2 Features
Jan 1, 2026January 2026 (Month: 2026-01) focused on strengthening numerical robustness, expanding test coverage for LCAO gamma-only calculations, and refactoring for modularity to support CUDA/ROCm. Key outcomes include adding gamma-only LCAO tests with MD indexing starting from 1 and updating a broad set of examples, hardening initialization across core components to eliminate uninitialized variables, and reorganizing the pw module and timer functionality to improve maintainability and scalability. These efforts reduce the risk of incorrect MD steps, increase reliability of simulations, and position the codebase for easier future GPU adaptations. The work also involved build-system and CI/CD readiness improvements to support smoother integration and deployment.
January 2026
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025 focused on delivering LCAO-enabled OFDFT initialization and robust charge-density handling in deepmodeling/abacus-develop. Core work refactored initialization paths, fixed critical allocation bugs, and introduced LCAO support with dedicated utilities and updated solvers. The changes include added LCAO_set.{h,cpp} and integration across esolver components, along with significant test coverage enhancements to prevent regressions. Performance improvements were achieved through reduced allocations and streamlined initialization, enabling more reliable and scalable OFDFT runs.
December 2025
2 Commits • 1 Features
Dec 1, 2025December 2025 focused on delivering LCAO-enabled OFDFT initialization and robust charge-density handling in deepmodeling/abacus-develop. Core work refactored initialization paths, fixed critical allocation bugs, and introduced LCAO support with dedicated utilities and updated solvers. The changes include added LCAO_set.{h,cpp} and integration across esolver components, along with significant test coverage enhancements to prevent regressions. Performance improvements were achieved through reduced allocations and streamlined initialization, enabling more reliable and scalable OFDFT runs.
November 2025
4 Commits • 3 Features
Nov 1, 2025November 2025 performance summary for deepmodeling/abacus-develop: Delivered modular refactors across density-matrix handling, DFT+U, and EsSolver paths. Implemented setup_dm to manage density-matrix operations across electronic state calculations and PEXSI, boosting modularity, reliability, and performance. Refactored DFT+U by removing GlobalC::dftu in favor of Plus_U, adding energy calculation enhancements for cleaner interfaces and better integration. Introduced LCAO_set module for EsSolver_KS_LCAO to simplify code and reduce complexity. Coupled these with targeted DM/PEXSI and EsSolver fixes to stabilize simulations and improve test reliability. These changes reduce technical debt, enable faster iteration, and position the stack for scalable future performance improvements.
4 Commits • 3 Features
Nov 1, 2025November 2025 performance summary for deepmodeling/abacus-develop: Delivered modular refactors across density-matrix handling, DFT+U, and EsSolver paths. Implemented setup_dm to manage density-matrix operations across electronic state calculations and PEXSI, boosting modularity, reliability, and performance. Refactored DFT+U by removing GlobalC::dftu in favor of Plus_U, adding energy calculation enhancements for cleaner interfaces and better integration. Introduced LCAO_set module for EsSolver_KS_LCAO to simplify code and reduce complexity. Coupled these with targeted DM/PEXSI and EsSolver fixes to stabilize simulations and improve test reliability. These changes reduce technical debt, enable faster iteration, and position the stack for scalable future performance improvements.
November 2025
October 2025
10 Commits • 2 Features
Oct 1, 2025October 2025 performance summary for deepmodeling/abacus-develop — focused on stabilizing and modernizing the ESolver core while expanding integration with DeepKS to enable future ML-based KS methods. Delivered a cohesive, maintainable foundation for electronic structure calculations, with concrete business value in reliability, maintainability, and readiness for GPU/ML-enabled workflows.
October 2025
10 Commits • 2 Features
Oct 1, 2025October 2025 performance summary for deepmodeling/abacus-develop — focused on stabilizing and modernizing the ESolver core while expanding integration with DeepKS to enable future ML-based KS methods. Delivered a cohesive, maintainable foundation for electronic structure calculations, with concrete business value in reliability, maintainability, and readiness for GPU/ML-enabled workflows.
September 2025
5 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for deepmodeling/abacus-develop focused on delivering a modernized, reliable output system and enhanced performance instrumentation. Key features delivered include a standardized output system for ABACUS (density matrices, ionic steps, electronic properties) with new output frequency control (out_freq_ion), dedicated output-control modules, and updated documentation/tests. Preparations for ABACUS 3.11 encompassed changes to file naming for wavefunctions and related outputs, integration of iter/itep in pW outputs, and broader compatibility improvements. Major architectural refinements included moving output-related code from ESolver_KS_PW and esolver_fp into dedicated ctrl_output modules to improve maintainability and testability. FFT timing instrumentation was added to the charge mixing module, with timers, grid-dimension assertions, and memory-leak prevention efforts for robustness. Several bug fixes addressed IO formatting and parameter readouts, including dmk/dmr, wfc_pw, and related tests. Overall impact: improved reproducibility, data integrity, performance visibility, and stability, enabling more reliable experiments and scalable runs.
5 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for deepmodeling/abacus-develop focused on delivering a modernized, reliable output system and enhanced performance instrumentation. Key features delivered include a standardized output system for ABACUS (density matrices, ionic steps, electronic properties) with new output frequency control (out_freq_ion), dedicated output-control modules, and updated documentation/tests. Preparations for ABACUS 3.11 encompassed changes to file naming for wavefunctions and related outputs, integration of iter/itep in pW outputs, and broader compatibility improvements. Major architectural refinements included moving output-related code from ESolver_KS_PW and esolver_fp into dedicated ctrl_output modules to improve maintainability and testability. FFT timing instrumentation was added to the charge mixing module, with timers, grid-dimension assertions, and memory-leak prevention efforts for robustness. Several bug fixes addressed IO formatting and parameter readouts, including dmk/dmr, wfc_pw, and related tests. Overall impact: improved reproducibility, data integrity, performance visibility, and stability, enabling more reliable experiments and scalable runs.
September 2025
August 2025
2 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08 for deepmodeling/abacus-develop: SIAB Tooling Modernization and Cleanup. Implemented updates to the SIAB tool build configuration and environment include paths to enhance cross-platform compatibility; removed legacy/unused code in the SIAB directory; added documentation for the tools directory to improve maintainability and deployment reliability. These changes reduce technical debt, streamline CI/CD readiness, and strengthen deployment stability across environments.
August 2025
2 Commits • 1 Features
Aug 1, 2025Monthly summary for 2025-08 for deepmodeling/abacus-develop: SIAB Tooling Modernization and Cleanup. Implemented updates to the SIAB tool build configuration and environment include paths to enhance cross-platform compatibility; removed legacy/unused code in the SIAB directory; added documentation for the tools directory to improve maintainability and deployment reliability. These changes reduce technical debt, streamline CI/CD readiness, and strengthen deployment stability across environments.
July 2025
4 Commits • 2 Features
Jul 1, 2025July 2025 performance summary for deepmodeling/abacus-develop. Delivered two key features to improve traceability and reporting for energy, dynamics, and relaxation workflows. Implemented a '#TOTAL ENERGY#' marker after each ion step and during SCF convergence, with updated formatting and tests. Refactored and enhanced output formats for RT-TDDFT, geometry relaxation, and MD initializations; improved unit clarity so forces and energy differences are reported in electron-volts per Angstrom; included fixes for relaxation output and related tests. These changes improve traceability, reproducibility, and reliability across simulation pipelines, and better support publication-ready results.
4 Commits • 2 Features
Jul 1, 2025July 2025 performance summary for deepmodeling/abacus-develop. Delivered two key features to improve traceability and reporting for energy, dynamics, and relaxation workflows. Implemented a '#TOTAL ENERGY#' marker after each ion step and during SCF convergence, with updated formatting and tests. Refactored and enhanced output formats for RT-TDDFT, geometry relaxation, and MD initializations; improved unit clarity so forces and energy differences are reported in electron-volts per Angstrom; included fixes for relaxation output and related tests. These changes improve traceability, reproducibility, and reliability across simulation pipelines, and better support publication-ready results.
July 2025
June 2025
7 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for deepmodeling/abacus-develop: Delivered two major features that unify and modernize output handling and control, backed by a set of commit-driven improvements across output naming conventions, DOS and PCHG reports, and LCAO output gating. This work enhances reproducibility, reduces downstream error risks, and improves IO efficiency during ionic steps. Key items include ABACUS Output System Modernization and Unified LCAO Output Control, with targeted commits to standardize file names, update docs, and centralize output control.
June 2025
7 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for deepmodeling/abacus-develop: Delivered two major features that unify and modernize output handling and control, backed by a set of commit-driven improvements across output naming conventions, DOS and PCHG reports, and LCAO output gating. This work enhances reproducibility, reduces downstream error risks, and improves IO efficiency during ionic steps. Key items include ABACUS Output System Modernization and Unified LCAO Output Control, with targeted commits to standardize file names, update docs, and centralize output control.
May 2025
11 Commits • 3 Features
May 1, 2025Month: 2025-05 — Deepmodeling/abacus-develop Key features delivered: - Test infrastructure improvements and test suite reorganization (HSE/LR, GPU tests, performance): refactored tests, reduced run time, and reorganized integration tests into 10+ subdirectories; updated test configurations across modules. - Output file naming conventions standardization: unified naming for wavefunction, potentials, charge densities, and kinetic densities; tests and docs aligned to new conventions. - Documentation updates for input parameters: expanded and clarified ABACUS input parameter descriptions to improve usability and coverage. Major bugs fixed: - Input readout and density matrix handling: fixed read_input_item_output parsing when out_chg=2; updated out_dm/out_dm1 parameters and related docs; added regression tests to prevent future regressions. Overall impact and accomplishments: - Faster feedback and more reliable releases due to leaner tests and standardized outputs; improved user experience and reproducibility; better regression safety across IO and density-related outputs. - Strengthened cross-module collaboration among testing, docs, and core IO. Technologies/skills demonstrated: - Test infrastructure modernization, CI-oriented automation, and performance optimization. - Documentation craftsmanship and user-focused parameter design. - Regression testing and change traceability via commit-backed changes.
11 Commits • 3 Features
May 1, 2025Month: 2025-05 — Deepmodeling/abacus-develop Key features delivered: - Test infrastructure improvements and test suite reorganization (HSE/LR, GPU tests, performance): refactored tests, reduced run time, and reorganized integration tests into 10+ subdirectories; updated test configurations across modules. - Output file naming conventions standardization: unified naming for wavefunction, potentials, charge densities, and kinetic densities; tests and docs aligned to new conventions. - Documentation updates for input parameters: expanded and clarified ABACUS input parameter descriptions to improve usability and coverage. Major bugs fixed: - Input readout and density matrix handling: fixed read_input_item_output parsing when out_chg=2; updated out_dm/out_dm1 parameters and related docs; added regression tests to prevent future regressions. Overall impact and accomplishments: - Faster feedback and more reliable releases due to leaner tests and standardized outputs; improved user experience and reproducibility; better regression safety across IO and density-related outputs. - Strengthened cross-module collaboration among testing, docs, and core IO. Technologies/skills demonstrated: - Test infrastructure modernization, CI-oriented automation, and performance optimization. - Documentation craftsmanship and user-focused parameter design. - Regression testing and change traceability via commit-backed changes.
May 2025
April 2025
10 Commits • 3 Features
Apr 1, 2025April 2025 performance summary for deepmodeling/abacus-develop. Key outcomes include feature-rich enhancements to DOS and PDOS analysis, magnetism-enabled Hamiltonian/Operator core, and a streamlined CI/CD pipeline with test-suite cleanup. These deliverables improve result clarity, robustness, and speed of feedback, enabling faster scientific iteration and more reliable magnetism simulations. Specific delivered items include multi-k point PDOS support and improved DOS output formats with build integration; magnetism-related refactors and DOS integration improvements plus new pw_setup.cpp (esolver) and standardization of magnetization naming; and CI/CD optimization through test removal and configuration cleanup that accelerates feedback loops.
April 2025
10 Commits • 3 Features
Apr 1, 2025April 2025 performance summary for deepmodeling/abacus-develop. Key outcomes include feature-rich enhancements to DOS and PDOS analysis, magnetism-enabled Hamiltonian/Operator core, and a streamlined CI/CD pipeline with test-suite cleanup. These deliverables improve result clarity, robustness, and speed of feedback, enabling faster scientific iteration and more reliable magnetism simulations. Specific delivered items include multi-k point PDOS support and improved DOS output formats with build integration; magnetism-related refactors and DOS integration improvements plus new pw_setup.cpp (esolver) and standardization of magnetization naming; and CI/CD optimization through test removal and configuration cleanup that accelerates feedback loops.
March 2025
9 Commits • 3 Features
Mar 1, 2025In 2025-03, the ABACUS-develop branch delivered three core improvements that enhance reliability, correctness, and maintainability of ESolver and related modules, alongside improved observability and output formatting. ESolver core reliability and data handling improvements consolidate convergence flag handling and data access, reducing edge-case failures and simplifying maintenance by updating interfaces and formats across ESolver and LCAO-related code. Magnetism calculations improvements strengthened direction determination, robustness, and consistency across related code paths, including minor bug fixes and formatting improvements. Timer/logging enhancements and symmetry/output formatting refactor reporting now focus on timers consuming more than 1% of total time and standardize ABACUS output after version 3.10, plus streamlining running.log and symmetry-related outputs for easier diagnostics. Overall impact includes more stable simulations, clearer diagnostics, and easier downstream parsing, enabling faster iteration and higher confidence in results.
9 Commits • 3 Features
Mar 1, 2025In 2025-03, the ABACUS-develop branch delivered three core improvements that enhance reliability, correctness, and maintainability of ESolver and related modules, alongside improved observability and output formatting. ESolver core reliability and data handling improvements consolidate convergence flag handling and data access, reducing edge-case failures and simplifying maintenance by updating interfaces and formats across ESolver and LCAO-related code. Magnetism calculations improvements strengthened direction determination, robustness, and consistency across related code paths, including minor bug fixes and formatting improvements. Timer/logging enhancements and symmetry/output formatting refactor reporting now focus on timers consuming more than 1% of total time and standardize ABACUS output after version 3.10, plus streamlining running.log and symmetry-related outputs for easier diagnostics. Overall impact includes more stable simulations, clearer diagnostics, and easier downstream parsing, enabling faster iteration and higher confidence in results.
March 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for deepmodeling/abacus-develop: Focused on stabilizing and elevating the optimization core by delivering targeted readability and robustness improvements to the BFGS workflow. Key changes include refactoring bfgs.cpp with added comments, improved formatting, and consistent variable initialization, plus a minor adjustment to the dsyev_ eigenvalue decomposition call to enhance numerical stability. These optimizations reduce production risk and lay groundwork for future performance enhancements and easier contributor onboarding.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for deepmodeling/abacus-develop: Focused on stabilizing and elevating the optimization core by delivering targeted readability and robustness improvements to the BFGS workflow. Key changes include refactoring bfgs.cpp with added comments, improved formatting, and consistent variable initialization, plus a minor adjustment to the dsyev_ eigenvalue decomposition call to enhance numerical stability. These optimizations reduce production risk and lay groundwork for future performance enhancements and easier contributor onboarding.
November 2024
16 Commits • 2 Features
Nov 1, 2024November 2024 focused on extending RDMFT capabilities and strengthening code quality. Delivered RDMFT enhancements and broader reporting in ESolver_KS_LCAO with richer outputs (density matrices, Hexx matrices, deepks) and core/tool refactors to support extended outputs. Alongside this, completed extensive documentation, header cleanups, doxygen-style comments, and robustness improvements across modules to improve maintainability and reliability. The combined work enhances analytical capabilities for users while reducing future maintenance risk and setting up a clearer path for future feature work.
16 Commits • 2 Features
Nov 1, 2024November 2024 focused on extending RDMFT capabilities and strengthening code quality. Delivered RDMFT enhancements and broader reporting in ESolver_KS_LCAO with richer outputs (density matrices, Hexx matrices, deepks) and core/tool refactors to support extended outputs. Alongside this, completed extensive documentation, header cleanups, doxygen-style comments, and robustness improvements across modules to improve maintainability and reliability. The combined work enhances analytical capabilities for users while reducing future maintenance risk and setting up a clearer path for future feature work.
November 2024
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Quality Metrics
Correctness86.2%
Maintainability86.4%
Architecture81.6%
Performance76.0%
AI Usage25.4%
Skills & Technologies
Programming Languages
CC++CMakeMakefileMarkdownPythonShellYAMLreStructuredText
Technical Skills
Algorithm DesignAlgorithm OptimizationBug FixBuild SystemBuild System ConfigurationBuild System ManagementBuild SystemsCC programmingC++C++ DevelopmentC++ developmentC++ programmingCI/CDCI/CD optimization
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