Add npmVersion command line argument to benchmark NPM versions (#7674)

* npmVersion CLIarg

* add readme description

---------

Co-authored-by: Linchenn <40653845+Linchenn@users.noreply.github.com>
Co-authored-by: Matthew Soulanille <msoulanille@google.com>

e2e/benchmarks/browserstack-benchmark/README.md

@@ -141,6 +141,11 @@ The following are supported options arguments which trigger options features:
     ``` shell
     node app.js --localBuild=core,webgl,wasm,cpu,layers,converter,automl
     ```
+  * --npmVersion
+    - Specify the npm version of TFJS library to benchmark. By default the latest version of TFJS will be benchmarked. 
+   ``` shell
+    node app.js --npmVersion=4.4.0 
+   ```
 
 ## Custom model
 The custom model is supported, but is constrained by:

e2e/benchmarks/browserstack-benchmark/app.js

@@ -284,9 +284,12 @@ function runBrowserStackBenchmark(tabId) {
     if (cliArgs.localBuild) {
       args.push(`--localBuild=${cliArgs.localBuild}`)
     };
+    if (cliArgs.npmVersion) {
+      args.push(`--npmVersion=${cliArgs.npmVersion}`)
+    };
+    
     const command = `yarn ${args.join(' ')}`;
     console.log(`Running: ${command}`);
-
     execFile('yarn', args, { timeout: 3e5 }, (error, stdout, stderr) => {
       if (error) {
         console.log(`\n${error}`);
@@ -417,6 +420,13 @@ function setupHelpMessage() {
     default: '',
     action: 'store'
   });
+  parser.add_argument('--npmVersion', {
+    help: 'specify the npm version of TFJS library to benchmark.' +
+      'By default the latest version of TFJS will be benchmarked' +
+      'Example: --npmVersion=4.4.0.',
+    type: 'string',
+    action: 'store'
+  });
   cliArgs = parser.parse_args();
   console.dir(cliArgs);
 }

e2e/benchmarks/browserstack-benchmark/karma.conf.js

@@ -66,7 +66,12 @@ module.exports = function(config) {
     if (config.localBuild?.includes(name)) {
       return `../../../dist/bin/${url}`;
     } else {
-      return `https://unpkg.com/@tensorflow/${url.replace('/', '@latest/')}`;
+      if (config.npmVersion){
+        let version = config.npmVersion;
+        return `https://unpkg.com/@tensorflow/${url.replace('/', '@' + version + '/')}`;
+      } else {
+        return `https://unpkg.com/@tensorflow/${url.replace('/', '@latest/')}`;
+      }
     }
   });