Machine learning scientist sollicitatievragen

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PathAI
Er werd een Machine Learning Scientist gevraagd...21 februari 2020

Probability, conventional machine learning, deep learning, coding/algorithm, behavioral

2 antwoorden

I was good with most of the questions

Can you share what they asked in the coding round?

Amazon

How do you weight 9 marbles three times on a balance scale to select the heaviest one.

3 antwoorden

Do they all have the same weight except for one?

I think the question is the rest of the 8 balls are the same weight. In that case you can find the heaviest in 2 tries. Minder

First weight 4 vs 4. If they're the same => the last one is the haviest. If not, weight 2 vs 2 of the haviest 4. Then weights 1 vs 1 of the haviest 2. Minder

Klaviyo

Fix a piece of sh*t code that just request data and save it to MySql. Super easy and easy to fix so I don't know what is the point of the interview. Totally a sh*t experience.

2 antwoorden

Can you please provide details of the technical round?

Super easy, it didn't need a master student to do it. So I don't want to remember it since it makes no sense. Minder

Amazon

Given a number, how to find a closest number in a series of floating point data.

2 antwoorden

Use a Binary Tree data structure. It is sorted while it stores the elements. Then traverse the tree. Search is log N. In Java there is a ceiling and floor function which does a BFS traversal and tries to search the closest number rounded off, to the nearest below or above number on the basis of ceiling or Floor function. Minder

Just loop over the series. Calculate abs(ref_num-x_i). Remember index of last seen lowest abs difference. In the end just return the element at the index you have saved to the end. \theat(n) time \theta(1) space additionaly (besides space for series) Minder

Amazon

1- Machine Learning concepts 2- Data Structure Case Study (Very easy) 3- Coding (Easy but they need hands-on exp) And Finally, Leadership (14 principles)

2 antwoorden

There is no right answer except for conceptual one. They need you to be natural and be good in what you do. I would suggest to do following: 1- Leadership 2- Coding 3- ML concepts Minder

Forgot to add, my feedback was mixed saying I need more Machine Learning knowledge (which I disagree) and hands-on coding (which killed my interview)! Minder

deeplearning.ai

An online exam that takes about 2 hours. Most of the material is about deep learning and machine learning. Most of the answers can be found on the coursera class of machine learning and deep learning.

1 antwoorden

Hi, I have an interview test with deeplearning.ai. It says there's some video answering section at the end. any comments or suggestions for it? Minder

Cloud Agronomics

Coding challenge prompt: Please send us an original code sample, the code should reflect the skills listed in the job requirements with base Python manipulations using the ML frameworks (Tensorflow, SKLearn, Keras, PyTorch).

1 antwoorden

We appreciate your feedback. Sorry you had a negative experience. We evaluate each code sample carefully and apologize for any delay as we’re a growing team handling large influxes of applications for all positions. Code quality is very important to us and we appreciate the effort and time you put into the application process. Minder

Netflix

we discussed mainly my background and some of the works I did, but she was not able to understand most of them. She was constantly interrupting me and trying to change the subject. The part that really got in her nerve was when I did not know what is 'original content". She explained that she means shows like "Orange is the new black", etc. which I do not watch. It was completely incomprehensible for her that some people may spend their time reading papers, or help their church high school kids instead watching fictional stories about women in prison.

1 antwoorden

If you want to pass the initial phone screen, make sure you know what is "original content" ! Minder

LinkedIn

Given a list of side lengths, how many triangles can you form with 3 sides in the list?

1 antwoorden

What does this have to do with data science?

IQVIA

What are the assumptions on independent variables for a linear model? Is the p-value valid if the independent variables are not normally distributed?

1 antwoorden

There is no assumption on the distribution of independent variables. Residuals have to follow specific distributions for p-value to be valid. Otherwise Monte Carlo simulation can be used to calculate p-value based on the sampling distribution of the parameters (interviewer was convinced that the answer is wrong and that normality of independent variables is necessary. I wonder how he treats 'dummy variables' that take values 0 or 1 as 'normally distributed') Minder

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