dhiOmics Analytics Machine Learning Scientist Interview Questions and Answers

Q1. What is evaluation Matrix for classification
Ans. 
Evaluation metrics for classification are used to assess the performance of a classification model.
• Common evaluation metrics include accuracy, precision, recall, F1 score, and ROC-AUC.

• Accuracy measures the proportion of correctly classified instances out of the total instances.

• Precision measures the proportion of true positive predictions out of all positive predictions.

• Recall measures the proportion of true positive p...read more
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Q2. What L1 and L2 regression
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L1 and L2 regression are regularization techniques used in machine learning to prevent overfitting.
• L1 regression adds a penalty equivalent to the absolute value of the magnitude of coefficients.

• L2 regression adds a penalty equivalent to the square of the magnitude of coefficients.

• L1 regularization can lead to sparse models, while L2 regularization tends to shrink coefficients towards zero.

• L1 regularization is also know...read more
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Q3. Explain random forest algorithm
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Random forest is an ensemble learning algorithm that builds multiple decision trees and combines their predictions.
• Random forest creates multiple decision trees using bootstrapping and feature randomization.

• Each tree in the random forest is trained on a subset of the data and features.

• The final prediction is made by averaging the predictions of all the trees (regression) or taking a majority vote (classification).
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Q1. Tell me about self
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I am a dedicated and passionate Machine Learning Engineer with a strong background in computer science and data analysis.
• Experienced in developing machine learning models for various applications

• Proficient in programming languages such as Python, R, and Java

• Skilled in data preprocessing, feature engineering, and model evaluation

• Strong understanding of algorithms and statistical concepts

• Excellent problem-solving and ana
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Q2. Questions about salary discuss
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Q1. Screening round: Tell me about your experiences?
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Q2. Tell me Learning and development challenges you faced and improvements you have done
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Genral and technical aptitude test

Q1. Overall experience?
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Q2. What was challenging role in previous org?
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Q3. How you see L&D from your perspective?
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Q4. How you tackle problems in your role?
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Q5. How will you onboard 500 candidates every month?
Ans. 
By creating a structured onboarding process, utilizing technology for efficiency, and leveraging a team of trainers.
• Develop a comprehensive onboarding program with clear objectives and timelines.

• Utilize technology such as online training modules and virtual onboarding sessions.

• Assign a team of trainers to handle different aspects of the onboarding process.

• Implement a buddy system where existing employees mentor new hir...read more
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Q1. Basic Stats questions
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Q2. Basic ML questions
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Q1. Describe about yourself
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I am a passionate and experienced Learning & Development Specialist with a strong background in designing and delivering effective training programs.
• Over 5 years of experience in creating engaging learning materials

• Skilled in conducting needs assessments and developing training plans

• Proficient in utilizing various instructional design methodologies

• Strong communication and presentation skills

• Proven track record of impro...read more
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Q2. Why is this job
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Q1. Started with basic os or network fundamentals like analyzing a core dump, handling tcp packet loss, difference between rest api and grpc etc. Then, from ML started with basic questions like bias variance t...read more
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Q1. Projects we have done earlier
Ans. 
We have worked on various projects involving image recognition, natural language processing, and predictive analytics.
• Image recognition: Developed a model to classify different types of fruits based on images.

• Natural language processing: Created a sentiment analysis tool for customer reviews.

• Predictive analytics: Built a model to forecast sales based on historical data.
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Q2. Aptitude questions
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Q1. Shift timings and salary discussion
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Q1. Details explain about project
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Q2. Explain Module in ml
Ans. 
A module in machine learning is a self-contained unit that performs a specific task or function.
• Modules can include algorithms, data preprocessing techniques, evaluation metrics, etc.

• Modules can be combined to create a machine learning pipeline.

• Examples of modules include decision trees, support vector machines, and k-means clustering.
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