Next.js example encounters JSON parsing issues with Transformer.js model

While using Brave browser

Version 1.61.101 Chromium: 120.0.6099.71 (Official Build) (x86_64)
(and also on Chrome
Version 120.0.6099.62 (Official Build) (x86_64)
without encountering any errors), I faced a JSON parsing issue when attempting to run the client-side example from Hugging Face's Next.JS tutorial for text classification. You can find the tutorial at: . This error prevented the text classification from working properly.

The specific error message I received is shown below:

https://i.sstatic.net/hIYrd.png

The code snippet below is from my TransformerWorker.js file, which is directly copied from the tutorial mentioned above without any modifications:

import { pipeline, env } from "@xenova/transformers";

// Skip local model check and cache
env.allowLocalModels = false;

// Use the Singleton pattern to enable lazy construction of the pipeline.
class PipelineSingleton {
    static task = 'text-classification';
    static model = 'Xenova/distilbert-base-uncased-finetuned-sst-2-english';
    static instance = null;

    static async getInstance(progress_callback = null) {
        if (this.instance === null) {
            this.instance = pipeline(this.task, this.model, { progress_callback });
        }
        return this.instance;
    }
}

// Listen for messages from the main thread
self.addEventListener('message', async (event) => {
    // Retrieve the classification pipeline. When called for the first time,
    // this will load the pipeline and save it for future use.
    let classifier = await PipelineSingleton.getInstance(x => {
        // We also add a progress callback to the pipeline so that we can
        // track model loading.
        self.postMessage(x);
    });

    // Actually perform the classification
    let output = await classifier(event.data.text);

    // Send the output back to the main thread
    self.postMessage({
        status: 'complete',
        output: output,
    });
});

Answer №1

After going through the Github problems related to transformers.js, I stumbled upon this link where a user recommended adding a specific line to the worker file:

env.userBrowserCache = false;

Disabling the browser cache option resolved the error I was encountering in the Brave browser. Moreover, the client-side code example from the Next.js tutorial by Hugging Face worked seamlessly without any further glitches.

However, browser caching is a crucial feature, hinting at a possible underlying bug that needs attention in the transformers.js codebase. For more details, check out the Github issue for transformers.js linked above.

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