##### Scenario Pinterest home-feed diversity initiative: posts can belong to topics like animals, recipes, etc. ##### Question What business benefits can come from increasing home-feed diversity? Propose several quantitative metrics to measure diversity of a user’s feed. For each metric, discuss possible biases and limitations. Consider the metric ‘percentage of posts from the same topic’—what bias does it carry? If you modify the ranking algorithm to improve diversity, design an experiment to test the change and define launch criteria. ##### Hints Think entropy, Gini, coverage; discuss user satisfaction, engagement, exploration; outline A/B-test design and guardrail metrics.

This question evaluates a data scientist's competency in product analytics, metric design, bias analysis, and causal experiment design for personalized recommendation systems.

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This is a hard difficulty Analytics & Experimentation question, commonly asked during Onsite rounds at TikTok.

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This question is commonly asked for Data Scientist candidates at TikTok during technical interviews.

Evaluate Home-Feed Diversity's Impact on User Engagement Metrics

Home-Feed Diversity: Benefits, Metrics, Biases, and Experiment Design

Context

You run a personalized home feed where each post is tagged with one or more high-level topics (e.g., animals, recipes). Product leadership wants to increase topical diversity in users' feeds without harming relevance.

Questions

What business benefits can come from increasing home-feed diversity?
Propose several quantitative metrics to measure diversity of a user's feed. For each metric, define it and discuss possible biases and limitations.
Consider the metric "percentage of posts from the same topic." What bias does it carry?
If you modify the ranking algorithm to improve diversity, design an experiment to test the change and define launch criteria.

Home-Feed Diversity: Benefits, Metrics, Biases, and Experiment Design

Context

Questions

What business benefits can come from increasing home-feed diversity?
Propose several quantitative metrics to measure diversity of a user's feed. For each metric, define it and discuss possible biases and limitations.
Consider the metric "percentage of posts from the same topic." What bias does it carry?
If you modify the ranking algorithm to improve diversity, design an experiment to test the change and define launch criteria.

Evaluate Home-Feed Diversity's Impact on User Engagement Metrics

Quick Overview

Home-Feed Diversity: Benefits, Metrics, Biases, and Experiment Design

Context

Questions

Solution

Comments (0)

Evaluate Home-Feed Diversity's Impact on User Engagement Metrics

Quick Overview

Home-Feed Diversity: Benefits, Metrics, Biases, and Experiment Design

Context

Questions

Solution

Comments (0)