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Seunghyuk Park (shepark)

PROFILE

Seunghyuk Park (shepark)

Worked on HabanaAI/vllm-fork and red-hat-data-services/vllm-gaudi, focusing on reliability, performance, and feature enhancements for large language model inference on HPU and Gaudi hardware. Addressed initialization robustness and memory efficiency by integrating LMCache for CPU offloading and KV cache sharing, and improved non-streaming chat completion through detokenization logic using Python and containerization. Enhanced runtime stability by fixing tensor shape mismatches in mrope position slicing and optimized attention mechanisms for Qwen2.5, aligning sequence length handling to restore performance. Demonstrated strong debugging, backend development, and deep learning skills, consistently delivering targeted solutions that improved production uptime and deployment reliability.

Overall Statistics

Feature vs Bugs

60%Features

Repository Contributions

5Total
Bugs
2
Commits
5
Features
3
Lines of code
894
Activity Months4

Work History

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026 monthly summary for red-hat-data-services/vllm-gaudi. Focused on stabilizing and accelerating Qwen2.5 inference on Gaudi by optimizing the attention pathway. Delivered a targeted refactor to align cu_seqlens/mask handling and remove unnecessary lens-based computation, restoring prior performance without changing model behavior. This work reduces regression risk, improves throughput, and supports reliable deployments across teams relying on VLLM Gaudi.

January 2026

1 Commits

Jan 1, 2026

January 2026 monthly summary for red-hat-data-services/vllm-gaudi: Reliability hardening of Mrope position slicing. Delivered a critical bug fix that prevents crashes when token requests exceed the precomputed prompt size by ensuring correct tensor shapes and robust handling of edge cases. The change reduces runtime crashes, improves uptime for production token streaming, and demonstrates strong debugging and tensor-shape management skills with traceability to the related Jira ticket GAUDISW-245941.

August 2025

1 Commits • 1 Features

Aug 1, 2025

2025-08 monthly summary for HabanaAI/vllm-fork: Implemented detokenization for non-streaming chat completion when VLLM_DETOKENIZE_ON_OPENAI_SERVER is true, enabling correct token-to-text decoding in non-streaming mode and improving generation accuracy under this server configuration. No major bugs fixed this month. Business value includes more reliable non-streaming deployments and higher quality text generation; tech focus centered on detokenization logic, non-streaming path handling, and server-config compatibility.

July 2025

2 Commits • 1 Features

Jul 1, 2025

July 2025 monthly summary for HabanaAI/vllm-fork: Focused on reliability improvements and scalable memory management to enable robust initialization and distributed inference across HPUs. Delivered two key outcomes with direct business value: improved startup robustness for embedding models and enhanced memory efficiency and scalability through LMCache integration for CPU offloading and KV cache sharing on HPU.

Activity

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Quality Metrics

Correctness88.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage28.0%

Skills & Technologies

Programming Languages

PythonShell

Technical Skills

API DevelopmentBackend DevelopmentContainerizationDebuggingDeep LearningDeep Learning FrameworksDistributed SystemsError HandlingHPU ComputingLarge Language ModelsMachine LearningModel OptimizationNatural Language ProcessingPerformance OptimizationPyTorch

Repositories Contributed To

2 repos

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

HabanaAI/vllm-fork

Jul 2025 Aug 2025
2 Months active

Languages Used

PythonShell

Technical Skills

ContainerizationDebuggingDeep Learning FrameworksDistributed SystemsHPU ComputingLarge Language Models

red-hat-data-services/vllm-gaudi

Jan 2026 Feb 2026
2 Months active

Languages Used

Python

Technical Skills

Error HandlingMachine LearningTensor ManipulationDeep LearningPyTorch