
Aleksandar Samardzic contributed to PyTorch’s core libraries, focusing on performance and correctness in matrix multiplication and tensor operations. He developed a CUTLASS-based kernel for row-wise scaled sparse FP8 operations in pytorch/ao, integrating CUDA and Python to optimize low-precision computation. In pytorch/pytorch, he enhanced grouped matrix multiplication with auto-tuning, dynamic dimension support, and robust error handling, while also addressing device compatibility for SM100 hardware. His work involved C++ and CUDA programming, code refactoring, and comprehensive testing, resulting in improved runtime efficiency, stability across hardware upgrades, and reduced manual tuning, reflecting a deep understanding of GPU computing and software maintainability.

August 2025: Key device compatibility hardening for SM100 in PyTorch. Implemented and validated correct reporting of _scaled_grouped_mm support status on SM100 and enforced compute capability checks to permit execution only on hardware with the appropriate compute capability. This prevents unsupported operations, improves stability for SM100 deployments, and aligns with the hardware support policy. Primary fix captured in commit 37da7b777b06e4a0f8e6192dd2a7e9047194fbf3 (PR #161780) in pytorch/pytorch.
August 2025: Key device compatibility hardening for SM100 in PyTorch. Implemented and validated correct reporting of _scaled_grouped_mm support status on SM100 and enforced compute capability checks to permit execution only on hardware with the appropriate compute capability. This prevents unsupported operations, improves stability for SM100 deployments, and aligns with the hardware support policy. Primary fix captured in commit 37da7b777b06e4a0f8e6192dd2a7e9047194fbf3 (PR #161780) in pytorch/pytorch.
July 2025 performance summary focusing on key deliverables in pytorch/pytorch. The main effort addressed Grouped Matrix Multiplication correctness and stability under CUDA/CUTLASS upgrade. This work ensured correctness, memory safety, and performance across upgrade scenarios, reducing risk for production workloads while enabling continued optimization efforts.
July 2025 performance summary focusing on key deliverables in pytorch/pytorch. The main effort addressed Grouped Matrix Multiplication correctness and stability under CUDA/CUTLASS upgrade. This work ensured correctness, memory safety, and performance across upgrade scenarios, reducing risk for production workloads while enabling continued optimization efforts.
June 2025 performance-focused update for pytorch/pytorch focusing on grouped matrix multiplications. Delivered auto-tuning enhancements for _scaled_grouped_mm enabling more flexible input configurations and improved performance, along with auto-tuning and Torch compile integration for _grouped_mm to optimize execution based on matrix dimensions and parameters. Implemented alignment and tensor creation improvements for grouped MMs, including handling dynamic dimensions, 16-byte alignment, improved output tensor creation with proper strides, clearer error messages, and a module rename from mm_scaled_grouped.py to mm_grouped.py for clarity. Overall, these changes enhance runtime efficiency, reduce manual tuning overhead, and improve code maintainability and error reporting.
June 2025 performance-focused update for pytorch/pytorch focusing on grouped matrix multiplications. Delivered auto-tuning enhancements for _scaled_grouped_mm enabling more flexible input configurations and improved performance, along with auto-tuning and Torch compile integration for _grouped_mm to optimize execution based on matrix dimensions and parameters. Implemented alignment and tensor creation improvements for grouped MMs, including handling dynamic dimensions, 16-byte alignment, improved output tensor creation with proper strides, clearer error messages, and a module rename from mm_scaled_grouped.py to mm_grouped.py for clarity. Overall, these changes enhance runtime efficiency, reduce manual tuning overhead, and improve code maintainability and error reporting.
March 2025 performance summary for pytorch/ao. Delivered a CUTLASS-based kernel for row-wise scaled sparse FP8 operations with accompanying benchmarks, tests, and documentation updates. Prepared usage guidelines and validated performance to support broader adoption of low-precision sparse kernels.
March 2025 performance summary for pytorch/ao. Delivered a CUTLASS-based kernel for row-wise scaled sparse FP8 operations with accompanying benchmarks, tests, and documentation updates. Prepared usage guidelines and validated performance to support broader adoption of low-precision sparse kernels.
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