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| Thanks to <a href="https://tvm.apache.org/" target="_blank" rel="noopener noreferrer">TVM</a> and <a href="https://teaclave.apache.org/docs/executing-wasm/" target="_blank" rel="noopener noreferrer">WebAssembly |
| Executor</a>, Teaclave is now |
| able to run the former—inference tasks. TVM can convert a model (or computation |
| graph) to an intermediate representation (IR) defined by TVM, and compile the |
| binary of this model from the IR. Since TVM recruits LLVM to emit binary code |
| and LLVM support WebAssembly as backend, Teaclave's WebAssembly Executor can |
| then execute the model's binary with additional lightweight runtime provided by |
| TVM.</p> <p>Although TVM has already provided an <a href="https://github.com/apache/tvm/tree/main/apps/wasm-standalone" target="_blank" rel="noopener noreferrer">wasm-standalone example |
| app</a>, we still |
| cannot copy and run it in Teaclave due to lack of WASI support and specific |
| context file interface. This document mainly focuses on the <em>what's different</em> |
| in Teaclave and we will finally build a MNIST inference function for Teaclave.</p> <h2 id="preparing-tvm-and-dependencies"><a href="#preparing-tvm-and-dependencies" class="header-anchor">#</a> Preparing TVM and Dependencies</h2> <p>All the dependencies has been installed or built in our docker image. If you do |
| not want to waste time on this step, you can skip this section with <a href="https://hub.docker.com/layers/teaclave/teaclave-build-ubuntu-1804-sgx-2.17.1/0.1.0/images/sha256-fd6c0e8a0bac53327408091ac8e11f911711477747116ecb4f3bf1094fb24c17" target="_blank" rel="noopener noreferrer">our |
| image</a> |
| prepared.</p> <p>TVM provides detailed build instruction in <a href="https://tvm.apache.org/docs/install/from_source.html" target="_blank" rel="noopener noreferrer">the |
| document</a>. Besides the |
| dependencies listed on their website, we also need to install (e.g. on Ubuntu |
| 18.04) these packages to build the example.</p> <div class="language-sh extra-class"><pre class="language-text"><code>sudo apt install protobuf-compiler libprotoc-dev llvm-10 clang-10 |
| pip3 install onnx==1.9.0 numpy decorator attrs spicy |
| </code></pre></div><div class="custom-block tip"><p class="custom-block-title">NOTE</p> <p>At the time of writing this document, latest <code>onnx</code> cannot work |
| because it depends on a higher version <code>protobuf</code>, which is not provided by |
| Ubuntu 18.04. We tested TVM with commit hash |
| <code>df06c5848f59108a8e6e7dffb997b4b659b573a7</code>. Later versions may work, but commits |
| older than this one hardly work.</p></div> <h2 id="compiling-wasm-library"><a href="#compiling-wasm-library" class="header-anchor">#</a> Compiling WASM Library</h2> <p>TVM offers a set of Python APIs for downloading, building, and testing the |
| model. Specifically, to compile a graph into binary, we need to:</p> <ol><li>Download the model</li> <li>Determine the name and shape of input</li> <li>Generate TVM IR module</li> <li>Compile(build) to LLVM WebAssembly target</li> <li>Save the object, graph, and param files</li> <li>Archive the object(<code>llvm-ar</code>) to a static library</li></ol> <p>After completing these steps, we will generate a static library with the |
| <code>PackedFunc</code> exported for inference task.</p> <p>The complete example build script can be found |
| <a href="https://github.com/apache/incubator-teaclave/blob/master/examples/python/wasm_tvm_mnist_payload/build_lib.py" target="_blank" rel="noopener noreferrer">here</a>.</p> <h2 id="bridging-with-teaclave"><a href="#bridging-with-teaclave" class="header-anchor">#</a> Bridging with Teaclave</h2> <p>Although the library is in WebAssembly, we can not use it directly in Teaclave |
| because it lacks parameters, and the interfaces is also not compatible with |
| Teaclave. So we need a wrapper program which contains a small runtime for the |
| compiled computation graph. This wrapper should:</p> <ul><li>Load model parameters and graph json</li> <li>Link with the graph library generated in the previous section</li> <li>Export an entrypoint which is compatible with the Teaclave's interface</li> <li>Read input data(image) using Teaclave's API and convert it to tensor</li> <li>Call the graph function and get the result back</li></ul> <p>Our wrapper is dependent on TVM's Rust APIs. We use <code>GraphExecutor</code> to achieve |
| calling to the graph library. Detailed mechanisms are explained in <a href="https://github.com/apache/tvm/tree/main/apps/wasm-standalone" target="_blank" rel="noopener noreferrer">TVM's |
| example</a>. our |
| example can be found |
| <a href="https://github.com/apache/incubator-teaclave/tree/master/examples/python/wasm_tvm_mnist_payload" target="_blank" rel="noopener noreferrer">here</a>.</p> <div class="custom-block tip"><p class="custom-block-title">NOTE</p> <p>To compile a Teaclave-compatible WASM binary, please make sure your |
| Rust version > 1.53. We tested on 1.54 stable.</p></div> <h2 id="execute-the-function"><a href="#execute-the-function" class="header-anchor">#</a> Execute the function</h2> <p>Just like any other Teaclave function, users need to prepare a simple Python |
| script to pass the function and data to Teaclave, and then get the result back. |
| The script of this example is |
| <a href="https://github.com/apache/incubator-teaclave/blob/master/examples/python/wasm_tvm_mnist.py" target="_blank" rel="noopener noreferrer">here</a>.</p> <div class="custom-block tip"><p class="custom-block-title">NOTE</p> <p>To compile a Teaclave-compatible WASM binary, please make sure your |
| Rust version > 1.53. We tested on 1.54 stable.</p></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">12/5/2022, 7:25:13 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"> |
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| Apache Teaclave (incubating) is an effort undergoing incubation at The Apache |
| Software Foundation (ASF), sponsored by the Apache Incubator. |
| Incubation is required of all newly accepted projects until a further review |
| indicates that the infrastructure, communications, and decision making process |
| have stabilized in a manner consistent with other successful ASF projects. While |
| incubation status is not necessarily a reflection of the completeness or |
| stability of the code, it does indicate that the project has yet to be fully |
| endorsed by the ASF. |
| Copyright © 2020 The Apache Software Foundation. |
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