Second State - How to use Rust + WebAssembly + Tencent and Principal Component Analysis (PCA) + SVG - Principal Component Analysis (PCA) of a 2-D data array, and then plot the results in an SVG graph. #125
The Principal Component Analysis (PCA) + SVG example
In this example, we demonstrate how to do Principal Component Analysis (PCA) of a 2-D data array, and then plot the results in an SVG graph. Checkout the live example here.
To draw SVG graphs in Rust, we used the techniques described by Cetra in this article.
Prerequisites
If you have not done so already, follow these simple instructions to install ssvmup on your development computer.
Build the WASM bytecode
$ ssvmup build
Package for deployment
$ cp pkg/pca_bg.wasm cloud/
$ cd cloud
$ zip pca.zip *
Go to Trigger Management, and Create Trigger. Select API Gateway Trigger from the list, and Submit.
Copy down the access path URL once the web API trigger is created.
Test
Next, go to the test folder and use curl to post a CSV data file to the access path URL. It should return a SVG graph plotting the input 2D points as well as the two principal components.
$ cd test
$ curl -d @iris.csv -X POST https://service-m9pxktbc-1302315972.hk.apigw.tencentcs.com/release/PCASVG
Web app
With this serverless function available at the access path URL, we can now build a web page front end for it. The web page is just HTML and JavaScript, and can be hosted on any computer, including your local laptop, and hence is truly serverless. The web page uses JavaScript to make requests for PCA computation and SVG drawing from the cloud function.
The Principal Component Analysis (PCA) + SVG example
In this example, we demonstrate how to do Principal Component Analysis (PCA) of a 2-D data array, and then plot the results in an SVG graph. Checkout the live example here.
Prerequisites
If you have not done so already, follow these simple instructions to install ssvmup on your development computer.
Build the WASM bytecode
Package for deployment
Deploy on TencentCloud
Follow the instructions here. Make sure that the "execution handler" is set to
pca_bg.wasmin the web console.Create a web service
Go to Trigger Management, and Create Trigger. Select API Gateway Trigger from the list, and Submit.
Copy down the access path URL once the web API trigger is created.
Test
Next, go to the
testfolder and usecurlto post a CSV data file to the access path URL. It should return a SVG graph plotting the input 2D points as well as the two principal components.Web app
With this serverless function available at the access path URL, we can now build a web page front end for it. The web page is just HTML and JavaScript, and can be hosted on any computer, including your local laptop, and hence is truly serverless. The web page uses JavaScript to make requests for PCA computation and SVG drawing from the cloud function.
Live web page | HTML source code
Note: You must enable CORS on the Tencent serverless cloud function's API gateway in order for the JavaScript AJAX calls to succeed.