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How to deploy pytorch lightning model to production

2020-11-08 16:58:56 InfoQ

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"italic"}],"text":" Mass service PyTorch Lightning A complete guide to the model ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/2a/2af6ef5180b94a7f67f50706f5e45a72.jpeg","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Looking at the field of machine learning , One of the main trends is the proliferation of projects focused on applying software engineering principles to machine learning .  for example ,"},{"type":"link","attrs":{"href":"https://github.com/cortexlabs/cortex","title":null},"content":[{"type":"text","text":"Cortex"}]},{"type":"text","text":" It reproduces the experience of deploying server free but reasoning pipelines . Similarly ,DVC Modern version control and CI / CD The Conduit , But only for ML."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"PyTorch Lightning With similar ideas , Only for training . The framework is PyTorch Provides Python Wrappers , It allows data scientists and engineers to write clean , Manageable and high performance training code ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" As a build   The whole person who deployed the platform  , Part of the reason is that we hate to write templates , So we are PyTorch Lightning A loyal supporter of . In this spirit , I've sorted it out PyTorch Lightning Guidelines for model deployment to production environments . In the process , We are going to look at several derivations PyTorch Lightning Model to include options in the inference pipeline ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":" Deploy PyTorch Lightning Every method of reasoning by model "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" There are three ways to derive PyTorch Lightning Model launch :"}]},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Save the model as PyTorch checkpoint "}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Convert the model to ONNX"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Export the model to Torchscript"}]}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" We can go through Cortex For these three ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"1. Package and deploy directly PyTorch Lightning modular "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Start with the simplest way , Let's deploy a... Without any transformation steps PyTorch Lightning Model ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"PyTorch Lightning Trainer Is an abstract template training code ( Think about training and validation steps ) Class , It has built-in save_checkpoint() function , This function will save your model as .ckpt file . To save the model as a checkpoint , Just add the following code to the training script :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/02/025d681f83213cf3d7ce1654847b7be8.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Now? , Before we start serving this checkpoint , It should be noted that , Although I always say “ PyTorch Lightning Model ”, but PyTorch Lightning yes PyTorch The wrapper - Project README Literally means “ PyTorch Lightning It's just organized PyTorch.”  therefore , The derived model is generic PyTorch Model , You can use... Accordingly ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" With preserved checkpoints , We can do it in Cortex Easily serve the model in . If you are not familiar with it Cortex, Sure  "},{"type":"link","attrs":{"href":"https://docs.cortex.dev/","title":null},"content":[{"type":"text","text":" Get familiar with it quickly here "}]},{"type":"text","text":", however Cortex A brief overview of the deployment process is :"}]},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" We use Python We wrote a prediction for our model API"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" We are YAML What defines us in API Infrastructure and behavior "}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" We use CLI Command deployment in API"}]}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Our prediction API Will use Cortex Of Python Predictor Class defines a init() Function to initialize our API And load the model , And use a define() Function to provide predictions at query time :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/d6/d6a2224d5d2b032568e54e234730313f.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" It's simple   We've adapted some of the code from the training code , Added some reasoning logic , That's it . One thing to pay attention to is , If you upload the model to S3( recommend ), You need to add some logic to access it ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Next , We are YAML Configure infrastructure in :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/dd/dd55dff424462894bebc088e789b4803.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Again , Simple . We gave it to us API Name it , tell Cortex Our prediction API Where is the , And allocate some CPU."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Next , We deploy it :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/ab/ab1263a55e354288c69ea8c91acae5ec.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Please note that , We can also deploy to clusters , from Cortex Speed up and manage :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/b8/b8c81954a32fd5b219ca9ef79961bae0.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" In all deployments ,Cortex Will container our API And make it public as Web service . Through cloud deployment ,Cortex Load balancing can be configured , Automatic extension , monitor , Updates and many other infrastructure features ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" this is it ! Now? , We have a real-time Web API, Model predictions are available on request ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"2. Export to ONNX And pass ONNX Launch at runtime "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Now? , We've deployed a normal PyTorch checkpoint , Make things more complicated ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"PyTorch Lightning Recently added a convenient abstraction , Used to export models to ONNX( before , You can use PyTorch The built-in conversion function of , Although they need more templates ). To export the model to ONNX, Just add the following code to your training script :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/15/15ab17629a85d7908b2da8580641e3b6.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Please note that , Your input sample should mimic the shape of the actual model input ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" export ONNX After the model , You can use Cortex Of ONNX Predictor To serve them . The code basically looks the same , And the process is the same . for example , This is a ONNX forecast API:"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/eb/ebe30166a5e0eeedd0170a9658c66515.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Basically the same . The only difference is , We don't initialize the model directly , But through onnx_client Access the data , This is a Cortex Launched to serve our model ONNX Runtime container ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" our YAML It looks very similar :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/ed/ed9c580485af9b3744717a2c388147b1.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" I've added a watch sign here , The purpose is just to show how easy the configuration is , And there are some ONNX Specific fields , But everything else is the same YAML."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Last , We use the same as before $ cortex deploy Command to deploy , And our ONNX API Enabled ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"3. Use Torchscript Of JIT The compiler serializes "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" For the final deployment , We will PyTorch Lightning The model is exported to Torchscript And use PyTorch Of JIT The compiler provides services . To export the model , Just add it to your training script :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/31/313b86adee9ed266007585a717b42bf5.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" For this purpose Python API With primordial PyTorch The examples are almost the same :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/3c/3c407844ca45ed4f88d95ef80acfef32.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"YAML Keep the same as before , also CLI The orders are, of course, consistent . If necessary , We can actually update our previous PyTorch API To use the new model , Just put the new and the old dictor.py The script is replaced by a new script , Then run... Again $ cortex Deploy :"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/12/12f3991706f8eddc7a82b8b48cd97da9.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Cortex Automatically perform rollover here , In this update , new API Will be activated , And then with the old API In exchange for , This avoids any downtime between model updates ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" That's all . Now? , You already have fully operational predictions for real-time reasoning API, According to the Torchscript Models provide predictions ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":" that , Which method should you use ?"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" The obvious question is which method works best . The fact is that , There is no simple answer here , Because it depends on your model ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" about BERT and GPT-2 etc. Transformer Model ,ONNX Can provide incredible optimization ( We measured "},{"type":"link","attrs":{"href":"https://www.cortex.dev/post/40x-nlp-inference-with-hugging-face-and-onnx","title":null},"content":[{"type":"text","text":"CPU Throughput improvement "}]},{"type":"text","text":" 了 "},{"type":"link","attrs":{"href":"https://www.cortex.dev/post/40x-nlp-inference-with-hugging-face-and-onnx","title":null},"content":[{"type":"text","text":"40"}]},{"type":"text","text":" times  ). For other models ,Torchscript May be better than vanilla PyTorch Better - Although there are some caveats , Because not all models are exported cleanly to Torchscript."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" Fortunately, , Deployment with any option is easy , You can test all three options in parallel , And see which way works best for your particular API."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":" If you like this article , Welcome to like forwarding ! thank you ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":" Don't go after watching, and there's a surprise !"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":" I carefully organized the computer /Python/ machine learning / Deep learning is related to 2TB Video lessons and books , value 1W element . Pay attention to WeChat public number “ Computers and AI”, Click the menu below to get the online disk link ."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":""}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/90/903237ffd0a3b3ae06272386f26ecb9e.png","alt":null,"title":null,"style":null,"href":null,"fromPaste":true,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}

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