# Taichi — Productive GPU Programming in Python

> Taichi is an open-source parallel programming language embedded in Python for high-performance numerical computation. It compiles Python functions to native GPU or CPU instructions via JIT, supporting CUDA, Vulkan, Metal, and OpenGL backends with a single codebase.

## Install

Save in your project root:

# Taichi — Productive GPU Programming in Python

## Quick Use
```bash
pip install taichi
python -c "
import taichi as ti
ti.init(arch=ti.gpu)

@ti.kernel
def hello():
    print('Hello from GPU!')

hello()
"
```

## Introduction
Taichi lets you write compute-intensive parallel code in plain Python syntax and run it on GPUs or multi-core CPUs without learning CUDA or Vulkan. A single decorator turns a Python function into a compiled GPU kernel.

## What Taichi Does
- Compiles Python functions into GPU/CPU machine code via LLVM-based JIT
- Provides a unified API across CUDA, Vulkan, Metal, OpenGL, and CPU backends
- Offers differentiable programming for physics simulation and optimization
- Includes sparse data structures (e.g., VDB grids) for memory-efficient computation
- Integrates with NumPy, PyTorch, and other Python scientific libraries

## Architecture Overview
When you decorate a function with @ti.kernel, Taichi's frontend parses the Python AST and lowers it into Taichi IR. The IR passes through optimization stages (loop vectorization, dead code elimination, memory access optimization) before the selected backend (LLVM for CPU/CUDA, SPIR-V for Vulkan, MSL for Metal) generates native machine code. Data is managed through Taichi fields, which abstract memory layout and enable automatic parallelization.

## Self-Hosting & Configuration
- Install via pip: pip install taichi (pre-built wheels for Linux, macOS, Windows)
- Select a backend with ti.init(arch=ti.gpu) or ti.init(arch=ti.cpu)
- No separate GPU SDK installation needed for Vulkan and Metal backends
- CUDA backend requires a compatible NVIDIA driver (CUDA toolkit not required)
- Configure memory allocation, kernel profiling, and debug mode via ti.init() parameters

## Key Features
- Write GPU code in pure Python without any C/CUDA boilerplate
- Automatic differentiation for gradient-based optimization and physics simulation
- Sparse data structures for efficient handling of large 3D grids and volumes
- Cross-platform: one codebase runs on NVIDIA, AMD, Apple, and Intel hardware
- Real-time visualization via ti.GUI and ti.ui for interactive debugging

## Comparison with Similar Tools
- **CUDA** — maximum GPU control but requires C++ and NVIDIA-only; Taichi is Python-native and portable
- **Numba** — JIT compiles Python for CPU/CUDA; Taichi adds Vulkan/Metal support and sparse data structures
- **PyTorch** — focused on deep learning; Taichi targets general parallel computation and physics simulation
- **JAX** — functional array programming with XLA; Taichi offers imperative kernels with mutable state
- **Warp (NVIDIA)** — Python GPU framework for simulation; Taichi supports more GPU backends and has a larger ecosystem

## FAQ
**Q: Do I need to know CUDA to use Taichi?**
A: No. You write standard Python and Taichi handles compilation to the selected GPU backend.

**Q: Can Taichi interoperate with PyTorch?**
A: Yes. Taichi fields can be converted to and from PyTorch tensors with zero-copy when on the same device.

**Q: What kinds of applications is Taichi best suited for?**
A: Physics simulation, computer graphics, image processing, scientific computing, and any workload that benefits from massively parallel execution.

**Q: Is Taichi production-ready?**
A: Taichi is used in research and production for real-time simulation, procedural generation, and GPU-accelerated data processing.

## Sources
- https://github.com/taichi-dev/taichi
- https://docs.taichi-lang.org/

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