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Brandon Rapanan

PROFILE

Brandon Rapanan

Worked on the tenstorrent/tt-metal, tenstorrent/tt-mlir, and tenstorrent/tt-xla repositories to advance machine learning infrastructure, focusing on JIT compilation, modular build systems, and robust testing. Developed features such as runtime performance analytics, dynamic memory configuration, and end-to-end interop testing for tensor operations using C++, Python, and MLIR. Enhanced reliability by expanding test coverage, improving error handling, and optimizing CI workflows. Addressed integration challenges by refactoring submodule dependencies and stabilizing build pipelines. Delivered memory-aware operator support and performance benchmarking for large models, ensuring scalable and maintainable code. Prioritized maintainability and efficiency across evolving machine learning and compiler toolchains.

Overall Statistics

Feature vs Bugs

77%Features

Repository Contributions

46Total
Bugs
5
Commits
46
Features
17
Lines of code
7,273
Activity Months11

Work History

June 2026

1 Commits

Jun 1, 2026

June 2026 monthly summary for tenstorrent/tt-xla: Maintained development momentum by addressing a blocking CI stability issue that impacted the tt-mlir uplift. Implemented a temporary workaround by disabling gpt_oss_20b_tp_d2m test to unblock progress while a formal fix is prepared. The change is tracked under issue #5121 with commit a97e3c74f7aff652a236c44e124f4e756aa43e58, and a follow-up PR (tt-mlir #8741) is in flight to re-enable the test once fixed. This approach preserves CI throughput and roadmap momentum.

May 2026

4 Commits • 2 Features

May 1, 2026

May 2026 performance and capabilities update for the D2M fusion ecosystem across TT-MLIR and TT-XLA. Focused on delivering robust D2M subgraph creation with clearer options, expanding end-to-end and integration test coverage, and stabilizing the D2M optimizer integration path. The work enables reliable OSS-20B bring-up and sets the stage for scalable performance benchmarking.

March 2026

4 Commits • 2 Features

Mar 1, 2026

March 2026: Focused on performance optimization, reliability, and test coverage for TTNN-JIT in tenstorrent/tt-mlir. Delivered a performance-boosting activation subgraph, stabilized Matmul tracing with updated intermediate-layout inference, and expanded test coverage with MeshTensor and composite Matmul validations. These workstreams improved tensor operation throughput, ensured correctness under layout changes, and increased CI robustness across the JIT pipeline.

February 2026

3 Commits • 2 Features

Feb 1, 2026

February 2026: Delivered memory-aware TTNN JIT enhancements and clamp operation support in tenstorrent/tt-mlir. Implemented MemoryConfig-driven output memory configuration with multi-layout support and D2M layout conversions in the TTNN JIT decorator, backed by comprehensive tests. Established a safe default output layout as maximally L1 block sharded to improve integration with upcoming layout features and avoid unsupported configurations. Extended operator coverage with TTNN JIT clamp support. Expanded test coverage through e2e tests (test/ttnn-jit/test_output_layouts.py) and IR tests, validating memory configs and layout transitions across D2M boundaries. Overall, these changes enable more memory-efficient execution, safer cross-layout transitions, and broader operator support in JIT mode.

January 2026

1 Commits • 1 Features

Jan 1, 2026

January 2026 monthly summary for tenstorrent/tt-mlir focused on TTNN JIT End-to-End Test Infrastructure Optimization. Reworked TTNN JIT E2E tests to reduce CI time by moving heavier tests to nightly runs and adding smoketests for on-push validation, preserving coverage while shortening validation cycles. The change is documented in commit c38e82afd3fc2ee7a733e65506c960ee42237b99, which moves test_eltwise.py, test_eltwise_composite.py, and test_reduction.py to nightly and introduces *_smoketest.py variants with no additional xfails. This work improves CI efficiency and reliability, enabling faster feedback for PRs while maintaining test quality.

December 2025

4 Commits • 1 Features

Dec 1, 2025

December 2025 monthly summary for tenstorrent/tt-mlir: Delivered JIT TTNN frontend enhancements and robustness improvements that increase flexibility, numerical accuracy, and reliability. Implemented dynamic sharding grid retrieval, added math fidelity options in the D2MtoTTNN pass, and expanded testing coverage for JIT'ed binary operations across mixed legacy sharding types. Also removed the max_grid constraint in the JIT decorator and hardened error handling for unsupported tensor layouts with dedicated tests. These changes reduce edge-case crashes, enable safer JIT operations across heterogeneous memory layouts, and improve overall developer and performance outcomes.

November 2025

3 Commits • 2 Features

Nov 1, 2025

Concise monthly summary for November 2025 focused on delivering robust TTNN JIT capabilities in tenstorrent/tt-mlir, expanding tensor support, improving test reliability, and enabling broader deployment readiness.

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 focused on expanding end-to-end interop testing for TTNN JIT element-wise operations in the tt-mlir repo. Delivered end-to-end TTNN JIT element-wise operation tests that validate interoperation between JIT-compiled operations and TTNN operations, covering unary and binary cases across multiple data types, tensor shapes, and memory layouts (L1 and DRAM). Strengthened regression safety for TTNN-JIT interop and enhanced test coverage across interop scenarios, setting a foundation for stable releases.

September 2025

6 Commits • 2 Features

Sep 1, 2025

Monthly work summary for 2025-09 focusing on tenstorrent/tt-metal. Delivered TTNN op-runtime-predictor integration and test stabilization, along with documentation and API clarity improvements for the TTNN runtime predictor. Achieved notable build/test reliability improvements and maintainable code changes enabling faster future predictor work. Business value includes more reliable predictor features in production builds and clearer API usage for internal teams.

August 2025

6 Commits • 2 Features

Aug 1, 2025

Concise monthly summary for 2025-08 focusing on business value and technical achievements in tenstorrent/tt-metal.

July 2025

13 Commits • 2 Features

Jul 1, 2025

July 2025 highlights TT-Metal progress focused on enabling ML performance analytics and modular build readiness. Delivered core integration of mlp-op-perf as a submodule to TT-Metal, enabling ML performance optimization, offline model support, and more modular build/dependency management. Implemented a runtime performance measurement interface for ML pipelines (JSON arg transformation and per-operation performance retrieval) and wired it into the runtime graph query flow. Fixed a syntax error in the runtime query operation to ensure reliable execution. Streamlined dependency management by removing conditional mlp-op-perf dependencies from TT-Metal third_party, consolidating them within the mlp-op-perf repo for cleaner builds. These efforts position TT-Metal for scalable performance analytics and easier onboarding of offline models, with a foundation for future ML workload optimization.

Activity

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Quality Metrics

Correctness91.8%
Maintainability88.6%
Architecture90.0%
Performance87.0%
AI Usage26.2%

Skills & Technologies

Programming Languages

C++CMakeGitJSONMLIRNonePythonShell

Technical Skills

API DevelopmentAPI developmentAffine MappingBenchmarkingBuild SystemsC++C++ DevelopmentC++ developmentCI/CDCMakeCMake configurationData structuresDeep LearningDependency ManagementError Handling

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

tenstorrent/tt-metal

Jul 2025 Sep 2025
3 Months active

Languages Used

C++CMakeGitNoneShellJSON

Technical Skills

API developmentBuild SystemsC++C++ developmentCMakeDependency Management

tenstorrent/tt-mlir

Oct 2025 May 2026
7 Months active

Languages Used

PythonC++MLIR

Technical Skills

Deep LearningMachine LearningPytestTensor OperationsTestingAffine Mapping

tenstorrent/tt-xla

May 2026 Jun 2026
2 Months active

Languages Used

Python

Technical Skills

API DevelopmentBenchmarkingMachine LearningTestingPythondebugging