Month: 2026-03 — FPSIM project focus: onboarding and contributor experience enhancements to streamline setup, testing, and contributions across fpsim/fpsim. This work lays a foundation for faster onboarding, higher-quality PRs, and more scalable collaboration.

February 2026 (2026-02) monthly summary for starsimhub/starsim. Focused on improving maintainability, cross-version compatibility, data capabilities, and developer experience, while advancing core functionality and test coverage. Key features delivered: - Documentation Improvements and Tooling: consolidated documentation, docstring formatting, docutils work, docs requirements, changelog/docs site updates, and related notebook notes. This enhances onboarding, API discoverability, and long-term maintainability. - Python 3.14 Compatibility: added Python 3.14 support, widening the supported runtime environments and reducing risk for customers upgrading Python versions. - Demographics updates and Epydemix integration: implemented and finalized demographics data updates and added Epydemix integration to extend analytics capabilities and interoperability. - Jupyter Notebook Enhancements: enabled Jupyter flags and plotting support across remaining notebooks to improve experimentation, visualization, and demos. - Migration scaffolding and docs: set up a migration folder and started migration documentation to streamline future data/model migrations. Major bugs fixed: - Remove unused import to clean lint/cleanup. - Timeline resolution fix and timepars formatting to ensure accurate timeline representations. - Initialization check in single-step mode to guarantee correct startup behavior. - Check notebooks validation bug fixed to restore reliable verification. - Fix mismatched docstrings (and related small doc correctness issues). Overall impact and accomplishments: - Significantly improved maintainability, testability, and cross-version compatibility, reducing release risk and enabling smoother onboarding for new contributors. - Strengthened data capabilities (demographics) and extended ecosystem integrations (Epydemix), enabling richer analytics for users. - Enhanced developer experience through better docs, testing, and notebook enhancements, supporting faster iteration and higher confidence in changes. Technologies/skills demonstrated: - Python ecosystem: Python 3.14 support, Python 3.13 compatibility checks in notebooks, and broader runtime validation. - Documentation tooling: docstring standardization, docutils, docs requirements management, changelog/doc site updates. - Testing and quality: added and finished tests, robust validation, and lint/cleanup practices. - Data and analytics: demographics data handling, Epydemix integration. - Notebook and visualization: improved Jupyter notebook support and plotting capabilities.

September 2025 monthly summary for starsimhub/starsim focusing on business value delivered and technical achievements. Two primary outcomes dominated the month: documentation usability improvements and aligning tests with updated simulations. The core enhancement was adding customize_aliases in docutils.py to manually create concise aliases for API functions (e.g., ss.Analyzer) and wiring this into the build process (build_docs.py) so aliases are applied after the initial API docs build. This results in shorter, more intuitive documentation links and reduced maintenance of doc references. In parallel, testing baselines and benchmarks were refreshed to reflect new simulation results (baseline.yaml and benchmark.yaml), ensuring test expectations stay in sync with current simulation behavior. Overall impact includes faster developer onboarding, more reliable documentation, and increased confidence in release quality through accurate test outcomes.

August 2025 monthly performance overview for starsim (starsimhub/starsim). The sprint focused on stabilizing core TimePar functionality, increasing test reliability, expanding date/time utilities, and advancing documentation and deployment workflows. Key outcomes include a working TimePar UFunc, stabilized test and notebook suites, enhanced data correctness, and startup/performance improvements that support faster, more reliable analytics and smoother releases.

Month: 2025-07 (starsimhub/starsim) Overview: This month focused on extending model flexibility, strengthening analytics, and improving reliability to deliver more business value with clearer APIs and more robust tests. Key features delivered: - Extensibility: Allow subclassing People to customize behaviors and integrate domain-specific logic (commit 381e31109516a0051261553a00c38ff96f639633). - Filter system update: Update and enhance the filtering logic for more precise data queries and faster iteration (commit 0bf140503e571933d166fc9aec420c6477519142). - Age Histogram visualization: Introduced age histogram visualization to improve demographic insights (commit dfc66c30bac2529c31bf4968fdfb86d543ea7617). - Finish implementing People plotting: Completed the People plotting feature to deliver end-to-end visualization for population data (commit 9ba6fc364f10ee33ce516d53ca2031e3a674abad). - Add beta parameter to RandomNet: Added beta parameter to RandomNet for more control over simulations (commit abe9e3e4c2c21373388d20aeb5fec8103df2f70f). Major bugs fixed: - Fix array representation bug: Resolved array repr issue to prevent incorrect data displays (commit fe6e585c86f7e70c8524534fa6cc3bc34886786f). - Disable saving regression parameters: Removed regression parameter persistence to avoid unintended state leakage (commit e8e1738e3c9524fcc724d425047ddd6bc19b314b). - Pytest/test suite stability: Fixed issues causing pytest failures and stabilized the test suite (commit cd8c1e4251d5921423e55d60ed8fa0c3470da2c7). - Claude integration test fixes: Addressed Claude-related test failures to improve CI reliability (commit 7bc6af8f4a9b4878fe924e40b5ea61eddb800b97). - Import resolution fixes: Resolved import-related failures to ensure smooth test execution (commit a98621727232128647776035c60869b43b9c447b). Overall impact and accomplishments: - The month delivered tangible business value through enhanced modeling flexibility, better analytics, and a more reliable codebase. Extensibility and visualization capabilities enable faster experimentation and clearer insights for stakeholders, while the stabilized tests reduce maintenance costs and shorten release cycles. Technologies and skills demonstrated: - Python OO design and modular architecture, advanced plotting and visualization, numpy/numba performance work, YAML/JSON config handling, API cleanup and refactors, documentation and notebooks, and robust test infrastructure (pytest, CI readiness).

June 2025 performance snapshot: Focused on delivering Claude-enabled documentation workflows, stabilizing release pipelines, and enabling maintainable architecture through targeted refactors. Key work spanned two repos (starsim and fpsim), emphasizing business value through clearer naming, robust integration points, and automated release tooling, while maintaining code quality and performance visibility.

May 2025 performance summary for starsimhub/starsim. Focused on improving notebook reproducibility, onboarding, and CI hygiene, while delivering maintainable infrastructure and documentation improvements. Key features and refactors were shipped across notebooks, utilities, project structure, and tutorial automation, complemented by notebook stability enhancements and CI/packaging refinements. Result: faster onboarding, cleaner notebook outputs for sharing, more reliable tests, and reduced maintenance overhead. Technologies demonstrated include Python packaging consolidation, CI/YAML updates, build/publish workflow enhancements, and extensive repo refactoring for maintainability.

April 2025 (2025-04) focused on improving documentation build reliability and notebook organization for starsimhub/starsim. The work enhances product usability for developers and end users by making docs safer to view and easier to navigate, while simplifying future maintenance.

March 2025 monthly summary for starsim/starsim and fpsim/fpsim. Delivered a comprehensive set of build, documentation, testing, and CI improvements across both repositories. Notable outcomes include cleaner build workflows, targeted tutorials builds, robust notebook tooling, and CI/test reliability gains. The work reduced maintenance costs, improved release confidence, and enabled faster iteration cycles.

February 2025 monthly summary for Starsim and FPSim. Delivered substantive feature enhancements, performance optimizations, and reliability improvements that increase simulation fidelity, reduce runtime and memory footprint, and accelerate engineering velocity. Key outcomes include the MixingPool beta parameter support with stabilized tests, the 2.3.0 calibration redesign with a modular MixingPool and a flexible summarize_by option in Result, memory optimization in the shrink path (2.3.1), fixes to Result shape handling and the new keep_case option for flatten outputs, and CI/CD/docs reliability improvements in FPSim to ensure stable releases.

Month: 2024-12 Overview: The December cycle delivered targeted improvements across fpsim/fpsim and starsim/starsim, focusing on correctness, reliability, and developer experience. The work enhances data processing, filtering accuracy, CI stability, and visualization capabilities, while improving run-time flexibility and documentation. These changes reduce risk, accelerate iteration, and enable clearer business insights from simulations. Key features delivered: - Scenarios API and processing enhancements (fpsim/fpsim): Added __len__ and __bool__ to Scenarios; refactored processing to use a local 'sims' dictionary for clarity while preserving birth-count logic. Commits: add scenario length, shrink scenarios. - Simulation filtering logic fix (fpsim/fpsim): Fixed boolean list generation for filtering by sex and age using direct boolean array operations, ensuring correct selection by sex, min age, and max age. - Documentation and tutorials improvements (fpsim/fpsim): Footer styling updates and expanded tutorials with subnational scenarios, interactive links, Colab/Binder links, and documentation link fixes. Commits include updates to footer, tutorials, docs links. - Visualization and data analysis support (starsim/starsim): Added seaborn to dependencies to enable enhanced data visualization. - Flexible run control and robustness (starsim/starsim): Enabled string parsing for the until parameter, added init checks for safe shrinking, and improved callable size handling for unspecified sizes. Included SEIR tutorial fixes for correctness. Major bugs fixed: - Stabilized test suite by skipping flaky calibration tests (starsim/starsim). - Intervention eligibility context fix by passing simulation object to eligibility checks. - Safe shrinking process: ensured initialization before shrinking networks/distributions/modules; refined size checks and warnings. - Callable parameter size handling: ensure None size supports callables via uids(). - SEIR tutorial: corrected new infections calculations and tidied imports. Overall impact and accomplishments: - Increased reliability of simulations and CI, reducing reruns and maintaining confidence in results. - Improved developer onboarding and usage with clearer APIs, better filtering correctness, and richer visualization capabilities. - Greater flexibility in run control and data exploration, enabling faster iteration and more actionable insights for stakeholders. Technologies/skills demonstrated: - Python data structures and boolean indexing for efficient filtering. - API design and code refactoring for readability and maintainability. - Test reliability engineering (skipping flaky tests) and CI hygiene. - Data visualization readiness (Seaborn integration). - Robust input handling and tutorial/documentation quality improvements.

November 2024 performance snapshot for starsim (starsimhub/starsim): Focused on stabilizing time handling, refining domain boundaries, and accelerating defaults and plotting/documentation improvements. Key architectural work included a Time subsystem overhaul and initialization flow, a unit system refresh with renamed rate_units and added error checks, and domain-boundary migration of slots to pregnancy. Ongoing defaults initialization neared completion, and multiple code cleanup and policy updates improved maintainability and governance.

October 2024 monthly summary: Delivered stability-focused improvements and architecture refactors across fpsim/fpsim and starsim/starsim. Business value delivered includes more reliable simulation runs, predictable experiment results, and cleaner API/tutorial alignment for faster onboarding and fewer support issues. Key work spans parameter handling stabilization, core MixingPools refactor with lifecycle management, enhanced time utilities and seeding, and targeted internal hardening (dependencies and logging).