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Junnan Wan

PROFILE

Junnan Wan

Worked on ROCm/FBGEMM and pytorch/FBGEMM repositories, focusing on kernel development and deployment reliability using C++, PyTorch, and Python. Addressed runtime stability in the block_bucketize_sparse_features_cpu kernel by explicitly handling unallocated tensors, defaulting optional tensors to nullopt to prevent serialization errors and improve robustness in sparse feature processing. Later, enhanced the TBE lookup kernel by adding support for the scale_bias_last option, ensuring consistent tensor shapes between publishing and inference. Updated kernel templates and host functions to align deployment behavior, reducing shape-mismatch risks and supporting smoother model integration across production workflows. Work emphasized maintainability and deployment readiness.

Overall Statistics

Feature vs Bugs

50%Features

Repository Contributions

2Total
Bugs
1
Commits
2
Features
1
Lines of code
162
Activity Months2

Work History

June 2025

1 Commits • 1 Features

Jun 1, 2025

June 2025 performance summary for pytorch/FBGEMM: Delivered a focused enhancement to the TBE path that improves deployment reliability and usability. Implemented support for the scale_bias_last option in the TBE lookup kernel, ensuring TBE tensors maintain consistent shapes between publishing and inference. Updated kernel templates and host functions to accommodate the new parameter, enabling smoother model loading and integration across deployment stages. This work reduces shape-mismatch risks during model loading and lays the groundwork for broader scale_bias configuration in production workflows.

February 2025

1 Commits

Feb 1, 2025

February 2025 monthly summary for ROCm/FBGEMM focusing on stability and reliability improvements in the CPU path for sparse feature serialization. Implemented a critical fix to prevent runtime errors by avoiding serialization of unallocated tensors and by defaulting certain optional tensors to nullopt (new_weights, new_pos, unbucketize_permute, bucket_mapping). This reduces failure modes in production, improving robustness and predictability of sparse feature processing.

Activity

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Quality Metrics

Correctness100.0%
Maintainability90.0%
Architecture90.0%
Performance90.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++Python

Technical Skills

C++GPU ProgrammingKernel DevelopmentPyTorchPython

Repositories Contributed To

2 repos

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

ROCm/FBGEMM

Feb 2025 Feb 2025
1 Month active

Languages Used

C++Python

Technical Skills

C++Kernel DevelopmentPyTorchPython

pytorch/FBGEMM

Jun 2025 Jun 2025
1 Month active

Languages Used

C++

Technical Skills

C++GPU ProgrammingKernel DevelopmentPyTorch