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Data scientist Interview Questions

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Describe different JOINs in SQL. Having a categorical variable with thousands distinct values, how would you encode it? How to find linear trends in time series. How to find the flow in a matrix showing temperature. ...

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I replied all the questions with confidence. The two phone interviewers were very nice and did not hesitate to explain again/more each question.

Having a categorical variable with thousands distinct values, how would you encode it ? Can you please answer this ?

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1. describe your current role 2. why do you think you are a good fit for the role 3. what's your plan for the next 5 years

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Explain machine learning algorithm 'X' that you use day to day. Explain difference between Random Forest and XGBoost.

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How will you add value to the business?

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Why you chose our company?

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I was asked to solve a Kaggle competition - one which was relevant to the Coles' line of business.

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Biggest mistakes, career path thinking, dream job

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Please use the awswrangler module to create a list of the files in the input folder that are not in the output folder. There is an AWS S3 bucket with two folders. Here is the initial code: import awswrangler as wr input_folder = 's3://mf-pythontest/in' output_folder = 's3://mf-pythontest/out' Using the AWS wrangler module, please create a list of the files in the input folder that are not in the output folders. The Required output is: ['doc_003.parquet']You must use the awswrangler package: https://github.com/awslabs/aws-data-wranglerYou will need to have some AWS credentials to access this public bucket. ***TIP*** The solution should have no more than three lines of code

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Quantify in number of years, the amount of experience you have working with machine learning algorithms

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What is the difference between bagging and boosting?

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