facebookresearch/tensorcomprehensions

Tensor Comprehensions is a tool that automatically writes fast machine learning code for you. Instead of hand-coding optimized kernels (the small, compute-heavy functions that power neural networks), you describe what mathematical operation you want in a simple language, and the tool generates high-performance code that runs on GPUs. It's like having an expert performance engineer working for you, you just describe the math, and it handles the complicated optimization details. Here's how it works in practice. You write a short description of your computation using a simple domain-specific language. For example, if you want to multiply two tensors (multi-dimensional arrays of numbers) in a specific way, you write a few lines that look like math notation. The tool then automatically tries many different ways to execute that operation on a GPU, tests each one to see which is fastest, and remembers the winner. Once you've found the best approach for one tensor size, you can reuse those same optimizations for different tensor sizes without re-tuning, a huge time saver. The real value is in the productivity gap it fills. Machine learning researchers want to experiment with new ideas quickly, but production systems need code that runs fast on GPUs. Normally this creates tension: fast GPU code is incredibly hard to write by hand. Tensor Comprehensions bridges that gap by automatically synthesizing kernels that achieve 80% or more of peak GPU performance. You get the speed without the expert-level performance engineering knowledge. The library works with popular frameworks like PyTorch and Caffe2, so it integrates naturally into existing workflows. This project is particularly useful for teams building custom machine learning operations that don't exist in standard libraries, or researchers exploring new layer designs who can't wait weeks for someone to hand-optimize each experiment. Instead of writing complex, platform-specific GPU code, you describe the operation once in a readable mathematical form, and the tool generates optimized implementations for NVIDIA GPUs. The autotuning happens once and the results generalize, making iteration cycles much faster.