One of the problems I have when testing giant TensorFlow models in TensorFlow.js is that they're huge (like 500 MB) and they take forever to download, every time I refresh the page. This is how I setup my ServiceWorker code so that at least in testing I only have to download the model once, and then it's saved in the cache for the next time.
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ServiceWorker code to cache Tensorflow model shards.
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| <html> | |
| <head> | |
| <script> | |
| // This is just to force HTTPS. | |
| if(location.protocol == 'http:') location.protocol = 'https:'; | |
| // Register the Service Worker | |
| if('serviceWorker' in navigator) { | |
| navigator.serviceWorker.register('/sw.js') | |
| .then(reg => console.log('🐳 Service Worker registered', reg)) | |
| .catch(err => console.error('⛈ Service Worker **not** registered', err)); | |
| } | |
| else { | |
| console.warn('Service Worker not supported in this browser'); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <p>You're on your own for everything else!</p> | |
| </body> | |
| </html> |
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| { | |
| "name": "your-app-name", | |
| "short_name": "your-app-namet", | |
| "description": "", | |
| "start_url": "/index.html" | |
| } |
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| // Change all of these constants to match your setup. | |
| const CACHE_NAME = 'your-app-name-assets'; | |
| // Location of all the shards, i.e. all the files next to your model.json file. | |
| const MODEL_PREFIX = 'https://storage.googleapis.com/your_model_name'; | |
| const NUM_SHARDS = 70; | |
| // Make sure your shards match this naming scheme (you might not have an extension, for example) | |
| const SHARDS_NAMING_SCHEME = (i) => `${MODEL_PREFIX}/group1-shard${i}of${NUM_SHARDS}.bin`; | |
| self.addEventListener('install', e => { | |
| e.waitUntil( | |
| (async function() { | |
| const cache = await caches.open(CACHE_NAME); | |
| const resources = []; | |
| resources.push(`${MODEL_PREFIX}/model.json`); | |
| for (let i = 1; i <= NUM_SHARDS; i++) { | |
| resources.push(SHARDS_NAMING_SCHEME(i)) | |
| } | |
| // If you have other local files you want to cache, like your index.html or style.css, | |
| // push them onto the resources array before the next line. | |
| await Promise.all([cache.addAll(resources)]); | |
| })() | |
| ); | |
| }); | |
| self.addEventListener('fetch', e => { | |
| // Fix the trailing slash. | |
| let request = e.request; | |
| if(request.url.endsWith('/')) { | |
| request = new Request(request.url + 'index.html', e); | |
| } | |
| e.respondWith( | |
| caches.match(e.request).then(response => { | |
| if (response) { | |
| console.log('Cached', e.request.url); | |
| return response; | |
| } else { | |
| console.log('Not cached, fetching', e.request.url); | |
| return fetch(e.request); | |
| } | |
| // Or this, if you don't want the console logs for debugging. | |
| // return response || fetch(e.request); | |
| }) | |
| ); | |
| }); | |
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