Lead Data Scientist Interview Questions

22,149 lead data scientist interview questions shared by candidates

The number of ways in which a sum can be reached. Given an array arr[] of length N and an integer target. You want to build an expression out of arr[] by adding one of the symbols ‘+‘ and ‘–‘ before each integer in arr[] and then concatenate all the integers. Return the number of different expressions that can be built, which evaluates to target.
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Data Scientist

Interviewed at Amazon

3.5
Jul 31, 2024

The number of ways in which a sum can be reached. Given an array arr[] of length N and an integer target. You want to build an expression out of arr[] by adding one of the symbols ‘+‘ and ‘–‘ before each integer in arr[] and then concatenate all the integers. Return the number of different expressions that can be built, which evaluates to target.

The technical questions covered a broad range of foundational topics, including statistics and probability theory, optimization, deep learning, reinforcement learning, causal inference, and generative AI. The most challenging (and quite unexpected) questions for me included those on the Hoeffding inequality and second-order optimizers.
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Applied Scientist

Interviewed at Amazon

3.5
Jan 4, 2025

The technical questions covered a broad range of foundational topics, including statistics and probability theory, optimization, deep learning, reinforcement learning, causal inference, and generative AI. The most challenging (and quite unexpected) questions for me included those on the Hoeffding inequality and second-order optimizers.

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