Decathlon Data Scientist Interview Questions and Answers

Q1. Bias and variance with respect to model
Ans. 
Bias and variance are two types of errors that can occur in a model.
• Bias refers to the error introduced by approximating a real-world problem, leading to underfitting.

• Variance refers to the error introduced by modeling the noise in the training data, leading to overfitting.

• Balancing bias and variance is crucial for creating a model that generalizes well to unseen data.
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Q2. Hypotheses test
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Q1. How to reduce model inference latency
Ans. 
To reduce model inference latency, optimize model architecture, use efficient algorithms, batch processing, and deploy on high-performance hardware.
• Optimize model architecture by reducing complexity and removing unnecessary layers

• Use efficient algorithms like XGBoost or LightGBM for faster predictions

• Implement batch processing to make predictions in bulk rather than one at a time

• Deploy the model on high-performance har
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Q2. Different sql joins and their difference
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SQL joins are used to combine rows from two or more tables based on a related column between them.
• INNER JOIN: Returns rows when there is at least one match in both tables.

• LEFT JOIN: Returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN: Returns all rows from the right table and the matched rows from the left table.

• FULL JOIN: Returns rows when there is a match in one of the tables.

• SEL
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Python and sql based questions

A/B Testing, data structures

Case Study was related to customer propensity to buy.

Q1. Linear Regression Assumptions
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Q2. ML Algorithms and Evaluation Metrics.
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Q1. What is VIF(variance inflation factor)
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Q1. Why do you want to join?
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Q1. Past experience
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3 Leet code mediums in 30 mins.

Q1. 5 ML questions in 10 mins
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Q2. 5 Stats question in 10 mins
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Q3. 3 LC mediums in 30 minutes
Ans. 
LC mediums refer to LeetCode mediums, which are medium difficulty coding problems on the LeetCode platform.
• LC mediums are coding problems with medium difficulty level on LeetCode platform.

• Solving 3 LC mediums in 30 minutes requires good problem-solving skills and efficient coding techniques.

• Examples of LC mediums include 'Longest Substring Without Repeating Characters' and 'Container With Most Water'.
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Q1. Heavy SQL solutions
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Retail case study, with soft skills is required for this round