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Krzysztof Wiśniewski

PROFILE

Krzysztof Wiśniewski

Krzysztof Wisniewski developed advanced model optimization and calibration features across HabanaAI/vllm-hpu-extension and intel/neural-compressor, focusing on scalable deployment of Mixtral and Deepseek models. He implemented expert parallelism and quantization-aware configurations using PyTorch and Python, enabling efficient multi-device Mixture-of-Experts workflows on Habana hardware. His work included robust calibration pipelines, case-insensitive model detection, and FP8 weight conversion tooling with runtime NaN validation, improving reliability and deployment readiness. Krzysztof refactored distributed communication and model handling logic, aligning APIs for production use. His contributions demonstrated depth in distributed systems, HPU optimization, and scripting, delivering maintainable solutions for large-scale inference.

Overall Statistics

Feature vs Bugs

71%Features

Repository Contributions

7Total
Bugs
2
Commits
7
Features
5
Lines of code
355
Activity Months6

Work History

July 2025

1 Commits • 1 Features

Jul 1, 2025

Concise monthly summary for performance review focused on business value and technical achievements for 2025-07.

June 2025

2 Commits • 2 Features

Jun 1, 2025

June 2025 monthly summary focusing on key accomplishments and business value across HabanaAI/vllm-hpu-extension and intel/neural-compressor. Delivered Deepseek calibration support and FP8 quantization enhancements enabling robust, accurate inference for Deepseek-enabled MoE models; improved calibration/config pipelines and API alignment for production deployments.

May 2025

1 Commits • 1 Features

May 1, 2025

Month 2025-05: Implemented expert parallelism support for Mixtral models on Habana accelerators, distributing experts across devices with correct routing and computation within Mixture-of-Experts layers. Adjusted quantization configuration and distributed communication to support the new parallelism. No major bugs fixed this period. Impact: enables scalable, multi-device deployment of Mixtral models on Habana hardware, improving throughput and resource utilization. Demonstrated skills in distributed systems, Habana hardware integration, quantization-aware configuration, and Mixture-of-Experts workflows.

April 2025

1 Commits • 1 Features

Apr 1, 2025

April 2025: Delivered scalable Mixtral model support with expert parallelism in the intel/neural-compressor repository. Implemented refactors for expert weights and scales to align with expert parallelism configuration and removed unnecessary all-reduce operations from measurement functions to optimize performance, enabling more efficient large-model deployments and better resource utilization.

March 2025

1 Commits

Mar 1, 2025

March 2025 monthly summary for HabanaAI/vllm-hpu-extension: Reverted ALiBi enablement to restore prior functionality, removed environment flags, and simplified attention logic to stabilize the HPU extension and maintain compatibility with vLLM workflows. This work reduces risk from ALiBi-related changes and improves maintainability while keeping the system ready for future enhancements.

February 2025

1 Commits

Feb 1, 2025

February 2025: Improved calibration robustness for HabanaAI/vllm-hpu-extension by implementing case-insensitive detection for Mixtral models in the calibration script. This change ensures that models with varied casing (e.g., Mixtral, MIXTral) are correctly identified, reducing calibration failures and streamlining model onboarding.

Activity

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Quality Metrics

Correctness87.2%
Maintainability80.0%
Architecture84.2%
Performance81.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++PythonShell

Technical Skills

Attention MechanismsCode RefactoringDeep LearningDistributed SystemsHPU OptimizationModel CalibrationModel ConversionModel OptimizationModel ParallelismPyTorchPython ScriptingQuantizationRevertScriptingShell Scripting

Repositories Contributed To

3 repos

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

HabanaAI/vllm-hpu-extension

Feb 2025 Jul 2025
4 Months active

Languages Used

ShellPythonC++

Technical Skills

Shell ScriptingAttention MechanismsCode RefactoringRevertDeep LearningModel Calibration

intel/neural-compressor

Apr 2025 Jun 2025
2 Months active

Languages Used

Python

Technical Skills

Deep LearningDistributed SystemsModel OptimizationPyTorchQuantization

HabanaAI/optimum-habana-fork

May 2025 May 2025
1 Month active

Languages Used

Python

Technical Skills

Deep LearningDistributed SystemsHPU OptimizationModel ParallelismPyTorch

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