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Machine Learning Data Scientist Interview Questions

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80 machine learning data scientist interview questions shared by candidates

Sections where you should add your own code and/or analysis are highlighted. Communicating your analysis with clear discussion and plots is very much appreciated. Feel free to add additional cells for any of your analysis and discussion. For this challenge you will be using raw 3-axis accelerometer (ACM) signals measured from a wearable device to build an automatic activity detection algorithm. We will be using the following two data files, which represent a single session from a single individual instructed to perform various activities in a laboratory setting. - **user1_accelerometer_data.parquet** - This pyarrow parquet file has raw accelerometer signals in x/y/z directions (in mill-g), with `time` (in seconds since epoch) continuously sampled at 50Hz. - **user1_activity_labels.csv** - This CSV file has the `time_start`, `time_end`, and `id` of each activity performed during the session.
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Machine Learning Data Scientist

Interviewed at Oura

3.5★
Oct 10, 2025

Sections where you should add your own code and/or analysis are highlighted. Communicating your analysis with clear discussion and plots is very much appreciated. Feel free to add additional cells for any of your analysis and discussion. For this challenge you will be using raw 3-axis accelerometer (ACM) signals measured from a wearable device to build an automatic activity detection algorithm. We will be using the following two data files, which represent a single session from a single individual instructed to perform various activities in a laboratory setting. - **user1_accelerometer_data.parquet** - This pyarrow parquet file has raw accelerometer signals in x/y/z directions (in mill-g), with `time` (in seconds since epoch) continuously sampled at 50Hz. - **user1_activity_labels.csv** - This CSV file has the `time_start`, `time_end`, and `id` of each activity performed during the session.

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