Overview

Utility library for machine learning-based ad filtering in webextensions.

Installation

``
npm i @eyeo/mlaf
`

Package Contents

- service: service worker/background script component for model management and inference
- hideIfClassifies: content script for data preprocessing and ad filtering
- tfjsPartial: a reduced version of TFJS' WebGL backend (pre-bundled with service) based on TFJS 3.19
- graphMLUtils: general purpose machine learning library for data preprocesing, model handling, TFJS handling

Minified Exports

``javascript
import { service, hideIfClassifies, tfjsPartial, graphMLUtils } from "@eyeo/mlaf";
`

Human-Readable Code

If it is desired to import or review human-readable code, see /src/*/.src.js. They are exported via @eyeo/mlaf/src:

`javascript
import { service, hideIfClassifies, tfjsPartial, graphMLUtils } from "@eyeo/mlaf/src";
`

Note, even in their human-readable format, service and tfjsPartial come pre-bundled with a heavily reduced and minified version of TFJS' WebGL backend in order to reduce the library's size. For a human-readable version of TFJS' WebGL backend see tfjs-backend-webgl.

Usage

`javascript
import { service } from "@eyeo/mlaf";

browser.runtime.onMessage.addListener(service.messageListener);
`

Alternatively, if you need more control over messages, you can forward only specific messages:

`javascript
import { service } from "@eyeo/mlaf"

browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
if (request && typeof request.type === "string" && request.type.startsWith(service.MESSAGE_PREFIX)) {
service.digestMessage(request)
.then(sendResponse)
.catch(sendResponse);
return true;
}
return false;
});
`

$3

The service component of this library provides a simple interface to configure certain functionality. Those flags can be set during initialization or at runtime.
See Telemetry for telemetry-related details.

`javascript
import { service } from "@eyeo/mlaf";

service.setOptions({
// Turn on/off telemetry.
// Default: true
telemetryOptOut: true,

// Turn on/off telemetry in private browsing/incognito mode.
// Default: false
privateBrowsingTelemetry: true

// Change telemetry report probability (float between 0.0 - 1.0)
// This value overrides the config-dictated probabilities embedded in the model of how often telemetry reports are sent.
// A value of 0 indicates a 0% chance for reports to be sent every time inference is run.
// A value of 0.5 indicates a 50% chance for reports to be sent every time inference is run.
reportProbability: 0.5,

// Change probability of telemetry reports to contain inference-related inputs (float between 0.0 - 1.0)
// This value overrides the config-dictated probabilities embedded in the model of how often telemetry reports contain feature matrices.
// A value of 0 indicates a 0% chance for telemetry reports to contain feature matrices.
// A value of 0.5 indicates a 50% chance for telemetry reports to contain feature matrices.
// Feature matrices aren't small in size (~50kb - 200kb) which is why they're limited to their own probability.
featureReportProbability: 0.1,

// Turn on/off allow listing/acceptable ads support when using ML to filter ads.
// For more on acceptable ads see https://acceptableads.com/
// If the option is set, allow listing will be performed in accordance with the option's return value.
// If the option is not set, allow listing/acceptable ads is not supported.
// The value is expected to be a function in accordance with webext-ad-filtering-solution's getAllowingFilters API
// https://eyeo.gitlab.io/adblockplus/abc/webext-ad-filtering-solution/#filters
// Default: undefined (allow listing turned off)
exceptionRules: ewe.filters.getAllowingFilters || (tdbId) => myAllowlistingFunction(tabId) && [allowingFilter] : [];
});

browser.runtime.onMessage.addListener(service.messageListener);
`

Options can be set during initialization and/or at runtime:

`javascript
import { service } from "@eyeo/mlaf";

// Set initial state
service.setOptions({ telemetryOptOut: someUserOptOutConfig });
browser.runtime.onMessage.addListener(service.messageListener);

// Update at runtime
function onOptOutChanged(val) {
service.setOptions({ telemetryOptOut: val });
}
`

$3

#### General Usage in Content Scripts

Load content script component and inject into websites:

##### Content Script

`javascript
import { hideIfClassifies } from "@eyeo/mlaf";

let modelName = "model-1.0.0";
let selector = ".example-selector"

hideIfClassifies(modelName, selector);
`

Set modelName to the desired model (automatically downloaded from https://easylist-downloads.adblockplus.org/models) and set selector to a CSS3 selector matching all DOM elements you want to run inference on.

##### manifest.json
`json
"content_scripts": [
{
"matches": [""],
"js": ["content_script.js"],
"all_frames": true
}
],
`

#### Example Integration in ABP Snippets:

Load and export content script in the desired bundle:

`javascript
import { hideIfClassifies } from "@eyeo/mlaf";

export const snippets = {
...
"hideIfClassifies": hideIfClassifies,
...
};
`

Usage in Other Projects

Usage of the library in projects not based on webextensions:

`javascript
import { tfjsPartial, graphMLUtils } from "@eyeo/mlaf";

// Model bundle consisting of model weights, model topology and preprocessing configuration.
let modelBundle = JSON.parse(modelFile);

// Dom element to run inference on
let domElement = document.querySelector("#example");

// Instantiate model from a model bundle and run inference.
let modelInstance = await graphMLUtils.loadBundledModel(tfjsPartial, modelBundle);
graphMLUtils.inference(tfjsPartial, modelInstance, modelBundle, domElement)
.then(prediction => console.log("Is ad:", prediction));

// The "inference" function is a shorthand data preprocessing, inference and prediction.
// This can be done manually in order to change or inspect data in each respective step:
let modelInstance = await graphMLUtils.loadBundledModel(tfjsPartial, modelBundle);
graphMLUtils.domToGraph(modelBundle, domElement)
.then(graph => graphMLUtils.preprocessGraph(modelBundle, graph, domain))
.then(preprocessedGraph => graphMLUtils.predict(tfjsPartial, modelInstance, modelBundle, preprocessedGraph))
.then(predictions => graphMLUtils.digestPrediction(predictions))
.then(prediction => console.log("Is ad:", prediction));
`

Additional Information

Telemetry

As outlined under Configuration, the library has the ability to send telemetry reports in order to monitor model performance.
Telemetry is only active if the library is used with models provided by eyeo, which come with a telemetry configuration.
Find technical details and data disclosure here.

If you're using the library with your own models, no telemetry will be triggered.

Code Dependencies

The library has no dependencies. Note, however, service and tfjsPartial come pre-bundled with a custom version of TFJS based on TFJS v3.19 which only hosts a WebGL backend and which is reduced to the minimum set of functions to run graph neural networks in order to keep the library's size as small as possible.

Webextension Requirements

$3

No specific extension permissions are required for the library to function.

If the content script component is injected into websites, the extension may require the following permissions:

- scripting (MV3)
- tabs (MV2)

### Usage of Shared Resources

The following browser/webextension APIs are used:

- IndexedDB
- browser.runtime.sendMessage
- browser.runtime.onMessage.addListener

IndexedDB is used within the background component in service. It is not accessed/exposed via the content script. The name of the database is ml.

Messaging via browser.runtime is used for communication between the content script and background component. All messages contain a field type with the message prefix ML:. Example: { type: "ML:prepare", model: "modelName" }`.

$3

Minimum browser versions
- Google Chrome v77
- Mozilla Firefox v63
- Opera v64
- Microsoft Edge v79

Webextension manifest versions
- MV2
- MV3

When used with ABP Snippets:
- Snippets v0.9.0

Development environment
- Node v16 or higher
- NPM v7 or higher
- Compatible with webextension-polyfill v0.8 or higher

Other

- Release notes