1968369 - Add noise to ohttp merino request, ctr support for inferred newtab personalization

Status: VERIFIED FIXED

(Firefox :: New Tab Page, enhancement)

Description

[rrando]

Add support in model for computing CTR using model type 'ctr'
Add support for adding laplace noise to the final outputs of the model, so that what is sent over ohttp is less identifiable over time

Comment 1

[rrando]

Attachment: Bug 1968369 - Add noise to ohttp merino request, ctr support for inferred newtab personalization

Comment 2

[Phabricator Automation]

Comment on attachment 9490546 [details]
Bug 1968369 - Add noise to ohttp merino request, ctr support for inferred newtab personalization

Revision D251087 was moved to bug 1954604. Setting attachment 9490546 [details] to obsolete.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/842b6f62b6b3
https://hg.mozilla.org/integration/autoland/rev/8063d7536a1e
Add noise to ohttp merino request, ctr support for inferred newtab personalization r=thecount,home-newtab-reviewers,cgopal,mlplyler

Comment 4

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/8063d7536a1e

Comment 5

[Maxx Crawford [:maxx]]

Attachment: Bug 1968369 - Add noise to ohttp merino request, ctr support for inferred newtab personalization

Add support for 'ctr' style model that computes cliktrhough rates

Add noise_scale parameter that applies laplace noise to every numerical output in the model

Bug 1968369 - Add noise to ohttp merino request, ctr support for inferred newtab personalization r=reviewer

[...details if needed...]

Original Revision: https://phabricator.services.mozilla.com/D251087

Comment 6

[Phabricator Automation]

firefox-beta Uplift Approval Request

• User impact if declined: This would impact the timeline for the inferred personalization experiment to go out
• Code covered by automated testing: yes
• Fix verified in Nightly: yes
• Needs manual QE test: yes
• Steps to reproduce for manual QE testing: See test plan in https://phabricator.services.mozilla.com/D251087
• Risk associated with taking this patch: Low
• Explanation of risk level: This entire feature is behind a pref
• String changes made/needed: No
• Is Android affected?: no

Comment 7

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/b02be1715dba
https://hg.mozilla.org/releases/mozilla-beta/rev/c8b88156bb9b

Comment 8

[Simona Rosu [:srosu], Ecosystem QA]

I have verified this enhancement using the latest Firefox Nightly 141.0a1 (Build ID: 20250617213038) build and Firefox Release Candidate 140.0 (Build ID: 20250616215311) on Windows 10 x64, macOS 15.5, and Ubuntu 24.04.1.

• After using the testing steps from test plan, I’m able to see the “Personalized Data” section on ASRouter Devtools, and it contains the following values:
  • Inferred Intrests: {"clicks": 3, "model_id": "TEST"}
  • Coarse Inferred Interests: { "clicks": 1, "model_id": "TEST"}
  • Coarse Inferred Interests With Differential Privacy: { "values": ["0110", "001", "000", "100", "010", "000", "100", "100" ], "model_id": "TEST"}