Mercor Data Scientist and Machine Learning Engineer Interview Questions and Answers

Q1. What is your favourite algorithm and how have you implemented it?
Ans. 
My favorite algorithm is Random Forest, which I have implemented for predicting customer churn in a telecom company.
• Random Forest is an ensemble learning method that builds multiple decision trees and merges them together to get a more accurate and stable prediction.

• I have implemented Random Forest in Python using scikit-learn library for a telecom company to predict customer churn based on various features like call d...read more
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Python arrays loops data structures

Q1. Project discussion technical challenges
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Q2. Deep learning neural network
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Q1. Basic ML questions and previous project-related queries
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Q1. Advanced ML questions
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Q1. Project handle queires
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Q1. What is the difference between Precision and Recall?
Ans. 
Precision is the ratio of correctly predicted positive observations to the total predicted positive observations, while Recall is the ratio of correctly predicted positive observations to the all observations in actual class.
• Precision focuses on the accuracy of positive predictions, while Recall focuses on the proportion of actual positives that were correctly identified.

• Precision = TP / (TP + FP)

• Recall = TP / (TP + FN...read more
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Q2. What are the hyperparameters of Random forest?
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Hyperparameters of Random Forest include number of trees, max depth of trees, minimum samples per leaf, and maximum features.
• Number of trees: Determines the number of decision trees in the forest.

• Max depth of trees: Controls the maximum depth of each decision tree.

• Minimum samples per leaf: Specifies the minimum number of samples required to be at a leaf node.

• Maximum features: Determines the maximum number of features t
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Q1. Questions related to college projects.
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Two questions asked which have difficulty level is high

Q1. Tell about sql joins
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• 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.

• F...read more
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Q2. What ks difference between delete and update
Ans. 
Delete removes a record entirely, while update modifies an existing record.
• Delete removes the entire record from the database

• Update modifies specific fields of an existing record

• Delete is irreversible, while update can be undone by another update

• Example: Deleting a user account vs updating the user's email address
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Q1. Project discussion
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Q2. Bigdata project questions
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Q1. Ml model discussion
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Q2. Have you implemented llama models
Ans. 
LLAMA models are used for large language model adaptation.
• LLAMA models are used for adapting large language models to specific tasks or domains.

• They are commonly used in natural language processing tasks such as text generation, translation, and sentiment analysis.

• Examples of LLAMA models include GPT-3, BERT, and RoBERTa.
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