mirror of https://github.com/tracel-ai/burn.git
610 lines
22 KiB
Markdown
610 lines
22 KiB
Markdown
<div align="center">
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<img src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/logo-burn-neutral.webp" width="350px"/>
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[![Discord](https://img.shields.io/discord/1038839012602941528.svg?color=7289da&&logo=discord)](https://discord.gg/uPEBbYYDB6)
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[![Current Crates.io Version](https://img.shields.io/crates/v/burn.svg)](https://crates.io/crates/burn)
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[![Documentation](https://img.shields.io/badge/docs-latest-blue)](https://burn.dev/docs/burn)
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[![Test Status](https://github.com/tracel-ai/burn/actions/workflows/test.yml/badge.svg)](https://github.com/tracel-ai/burn/actions/workflows/test.yml)
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[![CodeCov](https://codecov.io/gh/tracel-ai/burn/branch/main/graph/badge.svg)](https://codecov.io/gh/tracel-ai/burn)
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[![Rust Version](https://img.shields.io/badge/Rust-1.71.0+-blue)](https://releases.rs/docs/1.71.0)
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![license](https://shields.io/badge/license-MIT%2FApache--2.0-blue)
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---
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**Burn is a new comprehensive dynamic Deep Learning Framework built using Rust <br /> with extreme
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flexibility, compute efficiency and portability as its primary goals.**
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<br/>
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</div>
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<div align="left">
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## Performance
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<div align="left">
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<img align="right" src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/ember-blazingly-fast.png" height="96px"/>
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Because we believe the goal of a deep learning framework is to convert computation into useful
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intelligence, we have made performance a core pillar of Burn. We strive to achieve top efficiency by
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leveraging multiple optimization techniques described below.
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**Click on each section for more details** 👇
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</div>
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<br />
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<details>
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<summary>
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Automatic kernel fusion 💥
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</summary>
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<br />
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Using Burn means having your models optimized on any backend. When possible, we provide a way to
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automatically and dynamically create custom kernels that minimize data relocation between different
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memory spaces, extremely useful when moving memory is the bottleneck.
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As an example, you could write your own GELU activation function with the high level tensor api (see
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Rust code snippet below).
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```rust
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fn gelu_custom<B: Backend, const D: usize>(x: Tensor<B, D>) -> Tensor<B, D> {
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let x = x.clone() * ((x / SQRT_2).erf() + 1);
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x / 2
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}
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```
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Then, at runtime, a custom low-level kernel will be automatically created for your specific
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implementation and will rival a handcrafted GPU implementation. The kernel consists of about 60
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lines of WGSL [WebGPU Shading Language]("https://www.w3.org/TR/WGSL/https://www.w3.org/TR/WGSL/"),
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an extremely verbose lower level shader language you probably don't want to program your deep
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learning models in!
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> As of now, our fusion strategy is only implemented for our own WGPU backend and supports only a
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> subset of operations. We plan to add more operations very soon and extend this technique to other
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> future in-house backends.
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</details>
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<details>
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<summary>
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Asynchronous execution ❤️🔥
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</summary>
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<br />
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For [backends developed from scratch by the Burn team](#backends), an asynchronous execution style
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is used, which allows to perform various optimizations, such as the previously mentioned automatic
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kernel fusion.
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Asynchronous execution also ensures that the normal execution of the framework does not block the
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model computations, which implies that the framework overhead won't impact the speed of execution
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significantly. Conversely, the intense computations in the model do not interfere with the
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responsiveness of the framework. For more information about our asynchronous backends, see
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[this blog post](https://burn.dev/blog/creating-high-performance-asynchronous-backends-with-burn-compute).
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</details>
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<details>
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<summary>
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Thread-safe building blocks 🦞
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</summary>
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<br />
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Burn emphasizes thread safety by leveraging the
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[ownership system of Rust](https://doc.rust-lang.org/book/ch04-00-understanding-ownership.html).
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With Burn, each module is the owner of its weights. It is therefore possible to send a module to
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another thread for computing the gradients, then send the gradients to the main thread that can
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aggregate them, and _voilà_, you get multi-device training.
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This is a very different approach from what PyTorch does, where backpropagation actually mutates the
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_grad_ attribute of each tensor parameter. This is not a thread-safe operation and therefore
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requires lower level synchronization primitives, see
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[distributed training](https://pytorch.org/docs/stable/distributed.html) for reference. Note that
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this is still very fast, but not compatible across different backends and quite hard to implement.
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</details>
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<details>
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<summary>
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Intelligent memory management 🦀
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</summary>
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<br />
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One of the main roles of a deep learning framework is to reduce the amount of memory necessary to
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run models. The naive way of handling memory is that each tensor has its own memory space, which is
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allocated when the tensor is created then deallocated as the tensor gets out of scope. However,
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allocating and deallocating data is very costly, so a memory pool is often required to achieve good
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throughput. Burn offers an infrastructure that allows for easily creating and selecting memory
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management strategies for backends. For more details on memory management in Burn, see
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[this blog post](https://burn.dev/blog/creating-high-performance-asynchronous-backends-with-burn-compute).
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Another very important memory optimization of Burn is that we keep track of when a tensor can be
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mutated in-place just by using the ownership system well. Even though it is a rather small memory
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optimization on its own, it adds up considerably when training or running inference with larger
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models and contributes to reduce the memory usage even more. For more information, see
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[this blog post about tensor handling](https://burn.dev/blog/burn-rusty-approach-to-tensor-handling).
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</details>
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<details>
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<summary>
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Automatic kernel selection 🎯
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</summary>
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<br />
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A good deep learning framework should ensure that models run smoothly on all hardware. However, not
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all hardware share the same behavior in terms of execution speed. For instance, a matrix
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multiplication kernel can be launched with many different parameters, which are highly sensitive to
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the size of the matrices and the hardware. Using the wrong configuration could reduce the speed of
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execution by a large factor (10 times or even more in extreme cases), so choosing the right kernels
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becomes a priority.
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With our home-made backends, we run benchmarks automatically and choose the best configuration for
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the current hardware and matrix sizes with a reasonable caching strategy.
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This adds a small overhead by increasing the warmup execution time, but stabilizes quickly after a
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few forward and backward passes, saving lots of time in the long run. Note that this feature isn't
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mandatory, and can be disabled when cold starts are a priority over optimized throughput.
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</details>
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<details>
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<summary>
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Hardware specific features 🔥
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</summary>
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<br />
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It is no secret that deep learning is mosly relying on matrix multiplication as its core operation,
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since this is how fully-connected neural networks are modeled.
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More and more, hardware manufacturers optimize their chips specifically for matrix mutiliplication
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workloads. For instance, Nvidia has its _Tensor Cores_ and today most cellphones have AI specialized
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chips. As of this moment, we support Tensor Cores with our LibTorch and Candle backends, but not
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other accelerators yet. We hope [this issue](https://github.com/gpuweb/gpuweb/issues/4195) gets
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resolved at some point to bring support to our WGPU backend.
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</details>
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<details>
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<summary>
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Custom Backend Extension 🎒
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</summary>
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<br />
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Burn aims to be the most flexible deep learning framework. While it's crucial to maintain
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compatibility with a wide variety of backends, Burn also provides the ability to extend the
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functionalities of a backend implementation to suit your personal modeling requirements.
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This versatility is advantageous in numerous ways, such as supporting custom operations like flash
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attention or manually writing your own kernel for a specific backend to enhance performance. See
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[this section](https://burn.dev/book/advanced/backend-extension/index.html) in the Burn Book 🔥 for
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more details.
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</details>
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<br />
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## Training & Inference
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<div align="left">
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<img align="right" src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/ember-wall.png" height="96px"/>
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The whole deep learning workflow is made easy with Burn, as you can monitor your training progress
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with an ergonomic dashboard, and run inference everywhere from embedded devices to large GPU
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clusters.
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Burn was built from the ground up with training and inference in mind. It's also worth noting how
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Burn, in comparison to frameworks like PyTorch, simplifies the transition from training to
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deployment, eliminating the need for code changes.
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</div>
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<div align="center">
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<br />
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<a href="https://www.youtube.com/watch?v=N9RM5CQbNQc" target="_blank">
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<img src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/burn-train-tui.png" alt="Burn Train TUI" width="75%">
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</a>
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</div>
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<br />
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**Click on the following sections to expand 👇**
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<details>
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<summary>
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Training Dashboard 📈
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</summary>
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<br />
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As you can see in the previous video (click on the picture!), a new terminal UI dashboard based on
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the [Ratatui](https://github.com/ratatui-org/ratatui) crate allows users to follow their training
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with ease without having to connect to any external application.
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You can visualize your training and validation metrics updating in real-time and analyze the
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lifelong progression or recent history of any registered metrics using only the arrow keys. Break
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from the training loop without crashing, allowing potential checkpoints to be fully written or
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important pieces of code to complete without interruption 🛡
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</details>
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<details>
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<summary>
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ONNX Support 🐫
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</summary>
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<br />
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ONNX (Open Neural Network Exchange) is an open-standard format that exports both the architecture
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and the weights of a deep learning model.
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Burn supports the importation of models that follow the ONNX standard so you can easily port a model
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you have written in another framework like TensorFlow or PyTorch to Burn to benefit from all the
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advantages our framework offers.
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Our ONNX support is further described in
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[this section of the Burn Book 🔥](https://burn.dev/book/import/onnx-model.html).
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> **Note**: This crate is in active development and currently supports a
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> [limited set of ONNX operators](./burn-import/SUPPORTED-ONNX-OPS.md).
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</details>
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<details>
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<summary>
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Importing PyTorch Models 🚚
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</summary>
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<br />
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Support for loading of PyTorch model weights into Burn’s native model architecture, ensuring
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seamless integration. See
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[Burn Book 🔥 section on importing PyTorch](https://burn.dev/book/import/pytorch-model.html)
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</details>
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<details>
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<summary>
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Inference in the Browser 🌐
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</summary>
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<br />
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Several of our backends can compile to Web Assembly: Candle and NdArray for CPU, and WGPU for GPU.
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This means that you can run inference directly within a browser. We provide several examples of
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this:
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- [MNIST](./examples/mnist-inference-web) where you can draw digits and a small convnet tries to
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find which one it is! 2️⃣ 7️⃣ 😰
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- [Image Classification](./examples/image-classification-web) where you can upload images and
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classify them! 🌄
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</details>
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<details>
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<summary>
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Embedded: <i>no_std</i> support ⚙️
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</summary>
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<br />
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Burn's core components support [no_std](https://docs.rust-embedded.org/book/intro/no-std.html). This
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means it can run in bare metal environment such as embedded devices without an operating system.
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> As of now, only the NdArray backend can be used in a _no_std_ environment.
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</details>
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<br />
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## Backends
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<div align="left">
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<img align="right" src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/backend-chip.png" height="96px"/>
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Burn strives to be as fast as possible on as many hardwares as possible, with robust implementations.
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We believe this flexibility is crucial for modern needs where you may train your models in the cloud, then deploy on customer hardwares, which vary from user to user.
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</div>
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<br />
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Compared to other frameworks, Burn has a very different approach to supporting many backends. By
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design, most code is generic over the Backend trait, which allows us to build Burn with swappable
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backends. This makes composing backend possible, augmenting them with additional functionalities
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such as autodifferentiation and automatic kernel fusion.
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**We already have many backends implemented, all listed below 👇**
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<details>
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<summary>
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WGPU (WebGPU): Cross-Platform GPU Backend 🌐
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</summary>
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<br />
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**The go-to backend for running on any GPU.**
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Based on the most popular and well-supported Rust graphics library, [WGPU](https://wgpu.rs), this
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backend automatically targets Vulkan, OpenGL, Metal, Direct X11/12, and WebGPU, by using the WebGPU
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shading language [WGSL](https://www.w3.org/TR/WGSL/https://www.w3.org/TR/WGSL/). It can also be
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compiled to Web Assembly to run in the browser while leveraging the GPU, see
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[this demo](https://antimora.github.io/image-classification/). For more information on the benefits
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of this backend, see [this blog](https://burn.dev/blog/cross-platform-gpu-backend).
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The WGPU backend is our first "in-house backend", which means we have complete control over its
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implementation details. It is fully optimized with the
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[performance characteristics mentioned earlier](#performance), as it serves as our research
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playground for a variety of optimizations.
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See the [WGPU Backend README](./burn-wgpu/README.md) for more details.
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</details>
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<details>
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<summary>
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Candle: Backend using the Candle bindings 🕯
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</summary>
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<br />
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Based on [Candle by Hugging Face](https://github.com/huggingface/candle), a minimalist ML framework
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for Rust with a focus on performance and ease of use, this backend can run on CPU with support for
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Web Assembly or on Nvidia GPUs using CUDA.
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See the [Candle Backend README](./burn-candle/README.md) for more details.
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> _Disclaimer:_ This backend is not fully completed yet, but can work in some contexts like
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> inference.
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</details>
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<details>
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<summary>
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LibTorch: Backend using the LibTorch bindings 🎆
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</summary>
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<br />
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PyTorch doesn't need an introduction in the realm of deep learning. This backend leverages
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[PyTorch Rust bindings](https://github.com/LaurentMazare/tch-rs), enabling you to use LibTorch C++
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kernels on CPU, CUDA and Metal.
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See the [LibTorch Backend README](./burn-tch/README.md) for more details.
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</details>
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<details>
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<summary>
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NdArray: Backend using the NdArray primitive as data structure 🦐
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</summary>
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<br />
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This CPU backend is admittedly not our fastest backend, but offers extreme portability.
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It is our only backend supporting _no_std_.
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See the [NdArray Backend README](./burn-ndarray/README.md) for more details.
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</details>
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<details>
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<summary>
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Autodiff: Backend decorator that brings backpropagation to any backend 🔄
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</summary>
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<br />
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Contrary to the aforementioned backends, Autodiff is actually a backend _decorator_. This means that
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it cannot exist by itself; it must encapsulate another backend.
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The simple act of wrapping a base backend with Autodiff transparently equips it with
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autodifferentiation support, making it possible to call backward on your model.
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```rust
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use burn::backend::{Autodiff, Wgpu};
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use burn::tensor::{Distribution, Tensor};
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fn main() {
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type Backend = Autodiff<Wgpu>;
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let x: Tensor<Backend, 2> = Tensor::random([32, 32], Distribution::Default);
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let y: Tensor<Backend, 2> = Tensor::random([32, 32], Distribution::Default).require_grad();
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let tmp = x.clone() + y.clone();
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let tmp = tmp.matmul(x);
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let tmp = tmp.exp();
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let grads = tmp.backward();
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let y_grad = y.grad(&grads).unwrap();
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println!("{y_grad}");
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}
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```
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Of note, it is impossible to make the mistake of calling backward on a model that runs on a backend
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that does not support autodiff (for inference), as this method is only offered by an Autodiff
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backend.
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See the [Autodiff Backend README](./burn-autodiff/README.md) for more details.
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</details>
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<details>
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<summary>
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Fusion: Backend decorator that brings kernel fusion to backends that support it 💥
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</summary>
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<br />
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This backend decorator enhances a backend with kernel fusion, provided that the inner backend
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supports it. Note that you can compose this backend with other backend decorators such as Autodiff.
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For now, only the WGPU backend has support for fused kernels.
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```rust
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use burn::backend::{Autodiff, Fusion, Wgpu};
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use burn::tensor::{Distribution, Tensor};
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fn main() {
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type Backend = Autodiff<Fusion<Wgpu>>;
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let x: Tensor<Backend, 2> = Tensor::random([32, 32], Distribution::Default);
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let y: Tensor<Backend, 2> = Tensor::random([32, 32], Distribution::Default).require_grad();
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let tmp = x.clone() + y.clone();
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let tmp = tmp.matmul(x);
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let tmp = tmp.exp();
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let grads = tmp.backward();
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let y_grad = y.grad(&grads).unwrap();
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println!("{y_grad}");
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}
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```
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Of note, we plan to implement automatic gradient checkpointing based on compute bound and memory
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bound operations, which will work gracefully with the fusion backend to make your code run even
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faster during training, see [this issue](https://github.com/tracel-ai/burn/issues/936).
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See the [Fusion Backend README](./burn-fusion/README.md) for more details.
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</details>
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<br />
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## Getting Started
|
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|
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<div align="left">
|
||
<img align="right" src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/ember-walking.png" height="96px"/>
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|
||
Just heard of Burn? You are at the right place! Just continue reading this section and we hope you
|
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can get on board really quickly.
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|
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</div>
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|
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<details>
|
||
<summary>
|
||
The Burn Book 🔥
|
||
</summary>
|
||
<br />
|
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|
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To begin working effectively with Burn, it is crucial to understand its key components and
|
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philosophy. This is why we highly recommend new users to read the first sections of
|
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[The Burn Book 🔥](https://burn.dev/book/). It provides detailed examples and explanations covering
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every facet of the framework, including building blocks like tensors, modules, and optimizers, all
|
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the way to advanced usage, like coding your own GPU kernels.
|
||
|
||
> The project is constantly evolving, and we try as much as possible to keep the book up to date
|
||
> with new additions. However, we might miss some details sometimes, so if you see something weird,
|
||
> let us know! We also gladly accept Pull Requests 😄
|
||
|
||
</details>
|
||
|
||
<details>
|
||
<summary>
|
||
Examples 🙏
|
||
</summary>
|
||
<br />
|
||
|
||
Let's start with a code snippet that shows how intuitive the framework is to use! In the following,
|
||
we declare a neural network module with some parameters along with its forward pass.
|
||
|
||
```rust
|
||
use burn::nn;
|
||
use burn::module::Module;
|
||
use burn::tensor::backend::Backend;
|
||
|
||
#[derive(Module, Debug)]
|
||
pub struct PositionWiseFeedForward<B: Backend> {
|
||
linear_inner: nn::Linear<B>,
|
||
linear_outer: nn::Linear<B>,
|
||
dropout: nn::Dropout,
|
||
gelu: nn::GELU,
|
||
}
|
||
|
||
impl<B: Backend> PositionWiseFeedForward<B> {
|
||
pub fn forward<const D: usize>(&self, input: Tensor<B, D>) -> Tensor<B, D> {
|
||
let x = self.linear_inner.forward(input);
|
||
let x = self.gelu.forward(x);
|
||
let x = self.dropout.forward(x);
|
||
|
||
self.linear_outer.forward(x)
|
||
}
|
||
}
|
||
```
|
||
|
||
We have a somewhat large amount of [examples](./examples) in the repository that shows how to use
|
||
the framework in different scenarios. For more practical insights, you can clone the repository and
|
||
run any of them directly on your computer!
|
||
|
||
</details>
|
||
|
||
<details>
|
||
<summary>
|
||
Pre-trained Models 🤖
|
||
</summary>
|
||
<br />
|
||
|
||
We keep an updated and curated list of models and examples built with Burn, see the
|
||
[tracel-ai/models repository](https://github.com/tracel-ai/models) for more details.
|
||
|
||
Don't see the model you want? Don't hesitate to open an issue, and we may prioritize it. Built a
|
||
model using Burn and want to share it? You can also open a Pull Request and add your model under the
|
||
community section!
|
||
|
||
</details>
|
||
|
||
<details>
|
||
<summary>
|
||
Why use Rust for Deep Learning? 🦀
|
||
</summary>
|
||
<br />
|
||
|
||
Deep Learning is a special form of software where you need very high level abstractions as well as
|
||
extremely fast execution time. Rust is the perfect candidate for that use case since it provides
|
||
zero-cost abstractions to easily create neural network modules, and fine-grained control over memory
|
||
to optimize every detail.
|
||
|
||
It's important that a framework be easy to use at a high level so that its users can focus on
|
||
innovating in the AI field. However, since running models relies so heavily on computations,
|
||
performance can't be neglected.
|
||
|
||
To this day, the mainstream solution to this problem has been to offer APIs in Python, but rely on
|
||
bindings to low-level languages such as C/C++. This reduces portability, increases complexity and
|
||
creates frictions between researchers and engineers. We feel like Rust's approach to abstractions
|
||
makes it versatile enough to tackle this two languages dichotomy.
|
||
|
||
Rust also comes with the Cargo package manager, which makes it incredibly easy to build, test, and
|
||
deploy from any environment, which is usually a pain in Python.
|
||
|
||
Although Rust has the reputation of being a difficult language at first, we strongly believe it
|
||
leads to more reliable, bug-free solutions built faster (after some practice 😅)!
|
||
|
||
</details>
|
||
|
||
<br />
|
||
|
||
## Community
|
||
|
||
<div align="left">
|
||
<img align="right" src="https://raw.githubusercontent.com/tracel-ai/burn/main/assets/ember-community.png" height="96px"/>
|
||
|
||
If you are excited about the project, don't hesitate to join our
|
||
[Discord](https://discord.gg/uPEBbYYDB6)! We try to be as welcoming as possible to everybody from
|
||
any background. You can ask your questions and share what you built with the community!
|
||
|
||
</div>
|
||
|
||
<br/>
|
||
|
||
**Contributing**
|
||
|
||
Before contributing, please take a moment to review our
|
||
[code of conduct](https://github.com/tracel-ai/burn/tree/main/CODE-OF-CONDUCT.md). It's also highly
|
||
recommended to read our
|
||
[architecture document](https://github.com/tracel-ai/burn/tree/main/ARCHITECTURE.md), which explains
|
||
some of our architectural decisions. Refer to out [contributing guide](/CONTRIBUTING.md) for more
|
||
details.
|
||
|
||
## Status
|
||
|
||
Burn is currently in active development, and there will be breaking changes. While any resulting
|
||
issues are likely to be easy to fix, there are no guarantees at this stage.
|
||
|
||
## License
|
||
|
||
Burn is distributed under the terms of both the MIT license and the Apache License (Version 2.0).
|
||
See [LICENSE-APACHE](./LICENSE-APACHE) and [LICENSE-MIT](./LICENSE-MIT) for details. Opening a pull
|
||
request is assumed to signal agreement with these licensing terms.
|
||
|
||
</div>
|