Appen Senior Data Scientist Interview Questions and Answers

Python Coding Questions with

Bubble sort example Question using python

Previous projects based questions

Q1. Questions were asked related to ML modelling process
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Q2. Basic python coding
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Q1. What is Transformers and how they work
Ans. 
Transformers are models used in natural language processing tasks, known for their ability to handle long-range dependencies.
• Transformers use self-attention mechanism to weigh the importance of different words in a sentence.

• They consist of encoder and decoder layers, with each layer containing multi-head attention and feed-forward neural network.

• Examples of transformer models include BERT, GPT-3, and TransformerXL.
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Q2. How to train a model with imbalance data
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Use techniques like oversampling, undersampling, SMOTE, or ensemble methods to train a model with imbalanced data.
• Use oversampling to increase the number of minority class samples.

• Use undersampling to decrease the number of majority class samples.

• Use Synthetic Minority Over-sampling Technique (SMOTE) to generate synthetic samples for the minority class.

• Utilize ensemble methods like Random Forest or Gradient Boosting to
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3 coding questions of data structures

Q1. Previous work experience and skills
Ans. 
I have 5 years of experience in data analysis, machine learning, and statistical modeling. Proficient in Python, R, SQL, and Tableau.
• 5 years of experience in data analysis, machine learning, and statistical modeling

• Proficient in Python, R, SQL, and Tableau

• Developed predictive models for customer churn prediction using machine learning algorithms

• Performed data cleaning, preprocessing, and visualization for large dataset...read more
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Q2. Guesstimate about number of flights in India
Ans. 
There are approximately 2.5 million flights in India annually.
• India is one of the fastest growing aviation markets in the world.

• Major airports like Delhi, Mumbai, Bangalore, and Chennai handle a large number of flights daily.

• Airlines like IndiGo, SpiceJet, and Air India operate numerous domestic and international flights.

• The number of flights has been increasing steadily over the years due to growing demand for air tra
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Q1. Questions around the previous work
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Q2. Questions around how re-rank work, and image segmentation,
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Q3. Questions with podman and docker
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1.Describe your project.
2.Explain machine learning concept.

Presentation based question on case study

Q1. Tell something which you haven't put in your resume
Ans. 
I have experience in organizing and leading community service projects
• Organized a charity event to raise funds for a local animal shelter

• Led a team of volunteers in cleaning up a park in the neighborhood

• Coordinated a food drive for a homeless shelter
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Aptitude, coding on python NLP

Python Data Frames, String list manipulation

Q1. Common discussion
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Q2. Salary location etc
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