YOLO26n

From silicon to inference: building YOLO26n from scratch on a Raspberry Pi

Forget high-level frameworks for a moment.

4 min readMachine Learning
From silicon to inference: building YOLO26n from scratch on a Raspberry Pi
I implemented the YOLO26n model inference from scratch using ARM64 Assembly Language (No framework) [P]

There is a particular kind of clarity that arrives when you strip away every abstraction and confront the silicon directly. That is what this project represents: a Bachelor's thesis that re-implements YOLO26n inference from scratch using ARM64 Assembly and C, with no inference framework in sight. The author extracted the model parameters, redesigned the memory layout into a custom binary format, and built the entire pipeline, from NEON SIMD optimizations to Winograd convolutions and cache-aware tiling, all running on a Raspberry Pi 4. The result is correct object detection, though the performance gain was lower than expected. That honest admission is refreshing, and it is precisely where the real value of this work lives.

For our readers who have been following the progression of low-level machine learning, this story connects directly to the broader conversation about what it takes to move beyond high-level abstractions. We have previously explored how Unlock 2D Rotations: Exploring the Power of Complex Kimi Delta Attention demonstrates the expressivity gains possible when you rethink attention mechanisms from first principles. Similarly, the [Sharing my ML learning repo, NumPy to Transformers, 5 months, daily commits, all notebooks public. [D]](/post/sharing-my-ml-learning-repo-numpy-to-transformers-5-months-d-cmu91wx2d04i95ngm1211p2j9) shows that building understanding from the ground up, layer by layer, yields a depth of knowledge that simply reading documentation cannot match. This YOLO26 implementation is cut from the same cloth, but it goes one step further by descending into the assembly level, where every cycle and every cache miss is a deliberate choice rather than an accident of a compiler.

Our take is straightforward: this is the kind of project that does not need to beat a production framework to be a success. The stated goal was to understand how modern inference engines work at a low level, and by that measure, this is a triumph. The performance shortfall is not a failure; it is a lesson about the gap between theoretical optimization and real-world hardware behavior. When you write assembly by hand, you are not just translating code, you are negotiating with the machine's physical constraints. The author discovered that NEON intrinsics and cache tiling only get you so far when the memory access patterns and compute intensity are not perfectly aligned. That is a nuanced insight that no blog post or tutorial can teach as effectively as hands-on trial and error.

For anyone considering a similar path, we would say this: do not chase benchmark numbers on your first attempt. Chase comprehension. The fact that the thesis author is asking for feedback on CNN inference optimization and memory layout suggests they are already thinking like a serious systems engineer. The next step is not to abandon the assembly approach, but to profile harder, examine the generated code from a compiler like clang with `-O3`, and compare it against their hand-written kernels. There is also a rich area to explore in operator fusion, which they have already touched, and in understanding how the Winograd transform interacts with different filter sizes. The [Built a 100% Client-Side Vision Pipeline for Real-Time Chessboard & Multi-Board Detection (Chrome/Firefox Extension) [P]](/post/p-built-a-100-client-side-vision-pipeline-for-real-time-ches-cmu171kav0e3drgednp15hefb) article in our publication reminds us that edge deployment is often about creative constraint management, and this project is a prime example of that mindset applied at the lowest level.

The specific detail to watch here is the custom binary format for model parameters. Most people would have stopped at the assembly kernels, but redesigning the memory layout to match the inference pipeline is where the real performance wins hide. The question is whether they will iterate on that layout based on cache-line size and alignment, or whether they will move on to another project. We hope they keep going, because the gap between their current result and what is possible is likely smaller than they think, and closing that gap is exactly the kind of hard-won expertise that shapes a career.

From Machine Learning

This was my Bachelor's Final Project: implementing YOLO26n inference completely from scratch using ARM64 Assembly Language and C, without relying on existing inference frameworks.

The goal was to understand how modern neural network inference engines work at a low level and explore optimization techniques for faster and more efficient edge AI execution on Raspberry Pi 4.

Read the original at Machine Learning