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Which optimization techniques are in your toolkit, and how do they generally function?

Duolingo

Agoda

Expedia

9 months ago

Are decision trees a reliable tool for making predictions, or do they have limitations?

Duolingo

Cruise

Chewy

9 months ago

Could you explain the tradeoff between bias and variance in machine learning and share an instance where you have observed this phenomenon in a model's performance?

Duolingo

Bloomberg

Pluralsight

9 months ago

What would you consider the primary challenges in training deep neural networks with many layers?

Duolingo

Square

Curve

9 months ago

Why do you think feature selection is a crucial component of machine learning?

10 months ago

Duolingo

EPAM Systems

Addepar

10 months ago

Coding

Best Time to Buy and Sell Stock

You have access to an array where each element represents the price of a specific stock on a given day. Your objective is to maximize profit by selecting one day to purchase the stock and a different, future day to sell it. Determine and return the maximum profit achievable. If it's impossible to generate a profit, return 0.

Input: prices = [9,3,8,2,7,5]

Output: 5

Explanation: Purchase on day 2 (price = 3) and sell on day 5 (price = 7) for a profit of 7 - 3 = 4.

Duolingo

a year ago

System Design

Build a delayed payment system for Duolingo.

Machine Learning EngineerSite Reliability Engineering ManagerEngineering ManagerTechnical Program Manager

Duolingo

Citrix

Farfetch

a year ago

System Design

Create a recurring billing platform for Duolingo.

Machine Learning EngineerTechnical Program ManagerSite Reliability Engineering ManagerEngineering Manager

Duolingo

Intuit

PayPal

a year ago

Coding

Can you code a binary search routine and discuss its time efficiency? Additionally, is there room for further optimization?

Duolingo

Infineon

Ubisoft

a year ago

System Design

Design a notification service.

Duolingo