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Bartosz Kowalski

PROFILE

Bartosz Kowalski

Bartosz Kowalski contributed to deep learning infrastructure across several repositories, including intel/neural-compressor and red-hat-data-services/vllm-gaudi, focusing on model optimization, quantization, and CI/CD reliability. He implemented Int8 asymmetric quantization for Keras and JAX, aligning with XLA/OneDNN requirements and refactored model-saving wrappers to support custom Keras models, improving deployment pipelines. In vllm-gaudi, he integrated FP8 performance testing into Jenkins CI and streamlined test reruns, accelerating feedback cycles. Bartosz also delivered targeted bug fixes in HabanaAI/vllm-fork and vllm-hpu-extension, addressing graph stability and dynamic compilation issues using Python, PyTorch, and shell scripting to enhance runtime reliability and maintainability.

Overall Statistics

Feature vs Bugs

57%Features

Repository Contributions

7Total
Bugs
3
Commits
7
Features
4
Lines of code
724
Activity Months5

Work History

March 2026

2 Commits • 2 Features

Mar 1, 2026

March 2026: Delivered key quantization and model-saving enhancements for intel/neural-compressor, delivering tangible performance and usability gains for production deployment. Implemented Int8 asymmetric quantization support for Keras/JAX with dynamic and static paths, aligning with XLA/OneDNN requirements for symmetric weights and ensuring compatibility with existing models. Refactored model saving wrappers to better support custom Keras models, reducing integration friction and improving developer experience. Completed targeted code quality improvements and bug fixes (dtype checks in configs, cleanup of debug prints and unused imports) to improve stability and maintainability. These changes collectively improve inference efficiency, reduce memory footprint, and simplify deployment pipelines for quantized models.

July 2025

1 Commits

Jul 1, 2025

Monthly summary for 2025-07 focusing on HabanaAI/vllm-hpu-extension: delivered a critical stability fix for ModuleFusedSDPA by removing the initialization-time dependency on external fusedSDPA and directly instantiating and using the fsdpa kernel in the forward pass, ensuring proper integration into the computation graph. This fixed a graph break and improved reliability of the forward path on HPU hardware.

June 2025

1 Commits

Jun 1, 2025

June 2025 monthly summary for HabanaAI/vllm-fork: Implemented a targeted bug fix to stabilize dynamic compilation workflows by preventing weight synchronization during torch.compiler tracing. The syncing now occurs only during model loading, eliminating Dynamo tracing errors during forward passes when compilation is active and improving runtime reliability of compiled models. This effort reduces inference interruptions and enhances stability for deployed workloads.

April 2025

2 Commits • 2 Features

Apr 1, 2025

In Apr 2025, the vllm-gaudi CI and QA work focused on proactive regression visibility and test automation. Key features delivered include FP8 performance testing integration for t.compile in Jenkins CI and an expanded TESTOWNERS list to enable easier test reruns. No major bugs fixed this month; the emphasis was on accelerating feedback loops, improving CI reliability, and broadening contributor participation. Impact includes earlier detection of performance regressions, reduced manual QA effort, and faster validation cycles. Technologies demonstrated include FP8 benchmarking, Jenkins CI, benchmark script enhancements, and testing governance.

January 2025

1 Commits

Jan 1, 2025

January 2025: Delivered targeted stabilization for HPU-based workloads in red-hat-data-services/vllm-gaudi by implementing a direct call path for unified attention when direct_call is enabled. This bypasses recompilation triggers in the standard forward pass, addressing upstream changes and improving reliability of attention computations on HPU.

Activity

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Quality Metrics

Correctness82.8%
Maintainability82.8%
Architecture82.8%
Performance74.2%
AI Usage31.4%

Skills & Technologies

Programming Languages

Pythonbashyaml

Technical Skills

CI/CDCode RefactoringDebuggingDeep LearningDeep Learning FrameworksDevOpsHPU Extension DevelopmentJAXKerasMachine LearningModel OptimizationPerformance OptimizationPerformance TestingPyTorchPython Programming

Repositories Contributed To

4 repos

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

red-hat-data-services/vllm-gaudi

Jan 2025 Apr 2025
2 Months active

Languages Used

Pythonbashyaml

Technical Skills

DebuggingDeep LearningPerformance OptimizationCI/CDDevOpsPerformance Testing

intel/neural-compressor

Mar 2026 Mar 2026
1 Month active

Languages Used

Python

Technical Skills

Deep LearningJAXKerasMachine LearningModel OptimizationPython Programming

HabanaAI/vllm-fork

Jun 2025 Jun 2025
1 Month active

Languages Used

Python

Technical Skills

Code RefactoringDeep Learning FrameworksModel Optimization

HabanaAI/vllm-hpu-extension

Jul 2025 Jul 2025
1 Month active

Languages Used

Python

Technical Skills

HPU Extension DevelopmentPyTorch