# Machine Learning Engineer Interview Questions in United States

Companies rely on machine learning engineers to help design and improve the systems that allow their software to improve on its own, rather than being specifically programmed. During the interview process, be prepared to be tested heavily on both computer science and data science knowledge with an emphasis on recognizing patterns and trends. A bachelor's degree in computer science or a related field will be required.

3,194 Machine Learning Engineer interview questions shared by candidates

## Top Machine Learning Engineer Interview Questions & How to Answer

Here are three top machine learning engineer interview questions and how to answer them:

### Question #1: What are the most important algorithms, programming terms, and theories to understand as a machine learning engineer?

How to answer: Be prepared to talk about things like Type I and Type II errors, supervised and unsupervised machine learning, ROC curves, and other key parts of machine learning. Employers want to know you have a strong knowledge of the technical aspects of the job position.

### Question #2: How would you explain machine learning to someone who doesn't understand it?

How to answer: Sometimes machine learning engineers have to work with people who aren't familiar with the technical aspects of the job. Use this interview question as an opportunity to show your strong knowledge of the position and your communication abilities.

### Question #3: How do you stay up to date with the latest news and trends in machine learning?

How to answer: By talking about how you're up to date with the latest news and trends in machine learning, you can show an employer that you're engaged in the industry, a skilled researcher, and self-motivated.

## Top Interview Questions

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Machine Learning Software Engineer was asked...January 22, 2010

### Suppose you have a matrix of numbers. How can you easily compute the sum of any rectangle (i.e. a range [row_start, row_end, col_start, col_end]) of those numbers? How would you code this?

Compute the sum of the rectangles, for all i,j, bounded by (i,j), (i,m), (n,j), (n,m), where (n,m) is the size of the matrix M. Call that sum s(i,j). You can calculate s(i,j) by dynamic programming: s(i,j) = M(i,j) + s(i+1,j) + s(i,j+1) - s(i+1,j+1). And the sum of any rectangle can be computed from s(i,j). Less

Awesome!!

### Why does one use MSE as a measure of quality. What is the scientific/mathematical reason for the same?

Mean-Square error is an error metric for measuring image or video quality it is popular video and image quality metric because the analysis and mathematics is easier with this L2-Norm metric. Most video and image quality experts will agree that MSE is not a very good measure of perceptual video and image quality. Less

The mathematical reasoning behind the MSE is as follows: For any real applications, noise in the readings or the labels is inevitable. We generally assume this noise follows Gaussian distribution and this holds perfectly well for most of the real applications. Considering 'e' follows gaussian distribution in y=f(x) + e and calculating the MLE, we get MSE which is also L2 distance. Note: Assuming some other noise distribution may lead to other MLE estimate which will not be MSE. Less

MSE is used for understanding the weight of the errors in any model. This helps us understand model accuracy in a way that is helpful when choosing different types of models. Check out more answers on InterviewQuery.com Less

### How would you design a recommendation system (like amazon)?

Use collaborate filtering to compare personal preference with others. If A and B are similar, we can recommend preferred items in B to A. Less

Why downvote on other answer? He/she is right. Collaborative filtering is the most common strategy for recommendation systems. You see user A buys these things and user B also bought those things but user B bought this other thing too so let's show that thing to User A. Less

What were the online coding questions like? Could you elaborate?

Object detection. Is that what yours was?

it is same as mine. Could you give me more details about the online coding? what algorithm did they test on object detection part? Less

Yes

No

Yes

### What are some of the projects that you have done?

Do you mind to share what are the hard leetcode questions they asked during the interview? Less

I dont think it's fair to share which question they asked. But the exact same question is on leetcode and the difficulty level is hard. Less

What topic you are being ask from in leetcode? also did they ask you system design and CS fundamentals. Less

### Give an image, when we take 2 sub images from it, calculate the ratio similar to AnB/AuB.

Coded in python but wasn't able to finish it

Can you elaborate on the question

Given a matrix and coordinates of 2 rectangles calculate the weighted IoU in linear/constant time. Less

### Design round: Design an api rate limiter Coding round: simple manipulation of arrays and maps Craft round: Design an ML Labelling system

There will be many documents in a document database. The labelling system must use machine learning to label into different categories. Eg help desk, system document, technical. There will a small train dataset available but not entirely reliable. Less

The correct answer would be to use a combination of weak learning methods and gradually incorporate feedback and make it stronger Less

APi rate limiter was really simple, just look at uber/ratelimit on git and thats it. Rest was farily easy Less

### 1 question I had was next greatest element in an array - searching only to the right. I had a solution with O(n^2), but they said don't even bother, that's rejected

If you do it backwards, you actually just need to compare the last greatest value against the next element, so should be o(n) Less

Just use monotonic stack , it will help to get the next greatest element for every element of the array on O(n) with a space of o(n) Less

O(n^2) solution rejected, then tried reverse search, but ran out of time