Machine Learning Interview Questions (+ Tips to Answer Them)

Machine learning interviews allow you to demonstrate your abilities, expertise, and body of work. 

Please continue reading for a list of some of the most typical inquiries you might anticipate and advice on responding to them confidently. 

For machine learning positions, technical and programming interview questions are typical. However, recruiters use interviews to evaluate a qualified candidate's grasp of fundamental machine learning methods and ideas rather than aiming to surprise you with unexpected questions. 

This is your chance to distinguish yourself from the other applicants and emphasise the traits that make you a strong contender for the position.

Machine learning (ML) experience and qualifications can lead to employment in various fields, including data scientist, cloud architect, cybersecurity analyst, and machine learning engineer. 

However, you must prove to recruiters that you are knowledgeable to obtain these positions. There are a few typical interview questions that you should be prepared for if you're going into one with a machine learning focus. 

Here are some of the most typical machine learning interview questions you'll come across, along with some interview preparation guidance and ideas you should keep in mind to help you get started and develop the confidence you need to ace your following interview.

What to expect in a machine learning interview

In a machine learning interview, you can expect to be asked a combination of technical and theoretical questions about your knowledge and experience in the field. 

Technical questions may include problem-solving exercises, such as implementing a specific algorithm or analysing a dataset, and questions about programming languages and tools commonly used in machine learning, such as Python, TensorFlow, and sci-kit-learn. 

Theoretical questions include discussing the strengths and weaknesses of different algorithms, explaining the concept of overfitting, or discussing the bias-variance tradeoff. 

Additionally, you may be asked about your experience with specific machine learning applications, such as computer vision or natural language processing.

Machine Learning Interview questions plus tips to answer them

Here is a list of Machine Learning Interview questions, plus tips for answering them:

Can you explain the concept of overfitting in a model?

Overfitting occurs when a model is too complex and can fit the noise in the data rather than the underlying patterns. It results in a model that performs well on the training data but poorly on new, unseen data.


  • Explain the concept of overfitting in simple terms, with an example.
  • Mention techniques to prevent over fittings, such as regularisation and early stopping

How do you handle missing data in a dataset?

There are several ways to handle missing data, such as:

  • Removing observations with missing data (listwise deletion)
  • Imputing the missing values using statistical methods such as mean, median or mode.
  • Using a machine learning algorithm that can handle missing data, such as decision trees or random forests.


  • Explain the pros and cons of each method and when to use them.
  • Mention any specific libraries or packages that you have used to handle missing data in the past

Can you explain the bias-variance tradeoff in a model?

The bias-variance tradeoff is the balance between a model being too simple (high bias) and too complex (high variance). A model with high bias will have a low accuracy on both the training and test data, while a model with high variance will have a high precision on the training data but a low accuracy on the test data.


  • Use examples to explain bias-variance tradeoff
  • Mention techniques to balance bias and variance, such as regularisation and ensemble methods.

How do you evaluate the performance of a model?

The performance of a model can be evaluated using various metrics such as accuracy, precision, recall, and F1-score for classification problems and mean squared error (MSE), and mean absolute error (MAE) for regression problems. Additionally, k-fold cross-validation can estimate the model's performance on unseen data.


  • Explain what each metric measures and when to use them
  • Mention any specific libraries or packages that you have used to evaluate the performance of a model in the past.

Can you walk us through a recent machine-learning project you worked on?

Provide a brief overview of the project, including the problem you were trying to solve, the dataset you used, and the techniques and models you employed. Highlight the key challenges you faced and how you overcame them, and discuss any interesting insights or results you obtained.


  • Prepare a clear and concise overview of the project before the interview
  • Emphasise what you have learned and achieved from the project.
  • Bring any relevant code, visualisations, or report you have prepared for the project to support your explanation.

Tips to help ace your machine learning interview

  • Brush up on the fundamentals: Review the basic concepts and algorithms of machine learning, such as supervised and unsupervised learning, decision trees, and neural networks. Understand the math behind the algorithms and be able to explain them in simple terms.
  • Practice coding: Make sure you are proficient in at least one programming language commonly used in machine learning, such as Python or R. Practice implementing standard machine learning algorithms and solving problems using libraries like sci-kit-learn, TensorFlow, and Keras.
  • Study the latest trends: Keep yourself updated on the latest advancements and trends in the field, such as deep learning, reinforcement learning, and transfer learning. Be familiar with the most popular libraries and frameworks used in the industry.
  • Be able to explain your work: Be prepared to discuss your past machine learning projects in detail, including the problem you were trying to solve, the techniques and models you used, and the results you achieved. Be able to explain your thought process and the decisions you made during the project.
  • Be a good communicator: Clearly and effectively communicate your ideas in writing and verbally. Machine learning is an interdisciplinary field, and you may need to explain complex concepts to a non-technical audience.
  • Show interest in the company: You have researched and are genuinely interested in working there. Demonstrate how your skills and experience align with the company's mission and goals.
  • Ask good questions: Prepare thoughtful questions about the company and the role to show interest and curiosity.
  • Be honest: If you don't know the answer to a question, it's better to admit it and demonstrate your problem-solving approach than to try to bluff your way through an explanation.
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