Machine Learning
Interview Questions

How to Answer ML Interview Questions?

When faced with a machine learning interview question, it's important to take a deep breath and remember that you don't have to answer the question right away. Instead, take a moment to think through the problem, make sure you understand it fully, and then break it down into manageable pieces.

Clarify the Question

Before jumping into answering the question, make sure you fully understand what the interviewer is asking. Clarify any ambiguities or uncertainties. Make sure you know the problem statement, what kind of data you are dealing with, what kind of output is expected, and what metrics will be used to evaluate the solution.

Here are some questions that you can ask to clarify the question:

  • Can you explain the input format in more detail?
  • Are there any constraints or limitations I should be aware of?
  • Can you give an example of what the desired output should look like?
  • Is there a particular metric or performance measure that is most important for this problem?
  • Can you explain what you mean by [a specific term or concept mentioned in the question]?

Plan Your Approach

Once you understand the problem, take a moment to think through how you might approach solving it. Consider what algorithms or techniques might be appropriate, what kind of data preprocessing may be required, and what kind of model architecture would be best suited for the problem.

Break the problem into smaller parts

Next, break the problem down into smaller, more manageable pieces. Consider what steps you will need to take to preprocess the data, what features you will need to extract, what kind of model you will use, and what parameters you will need to tune.

  • Identify the sub-problems: Once you have understood the problem statement, try to identify the sub-problems that can help you solve the larger problem.
  • Identify dependencies: Once you have identified the sub-problems, try to identify any dependencies between them. Some sub-problems may depend on the solution of other sub-problems. Understanding these dependencies will help you to decide the order in which you need to solve the sub-problems.
  • Use examples: Use examples to illustrate each sub-problem. This will help you to understand the problem better and to communicate your thought process more effectively to the interviewer.

Outline your solution

After breaking the problem down into manageable parts, outline your solution. This should include a brief summary of each step, along with any assumptions or tradeoffs you are making.

Here are some practical tips to help you with this step:

  • Define the high-level steps: Start by defining the high-level steps that will be taken to solve the problem. These should be broad steps that will guide your approach to solving the problem. For example, if you're asked to build a machine learning model to predict customer churn, your high-level steps might include data preparation, feature engineering, model selection, and model evaluation.
  • Consider alternative approaches: Before finalizing your solution, consider alternative approaches that could be taken. This helps you to think critically about your solution and ensure that you have considered all possible options. For example, if you're building a recommendation system, you might consider using collaborative filtering or content-based filtering as alternative approaches.
  • Ensure your solution is scalable: When outlining your solution, make sure it is scalable. This means that the solution should be able to handle larger amounts of data or more complex problems if required. Consider using tools and techniques that are scalable, such as parallel computing or cloud computing.

Discuss potential issues

Finally, be prepared to discuss potential issues or challenges you may encounter during the solution process. Consider what assumptions you are making, what kind of data you will need, and what potential sources of error or bias may exist.

Use Personal Experience

During your machine learning interview, try to draw on your relevant experiences as much as possible. If the interviewer asks you to design a text sentiment analysis system, you can mention any similar projects you have worked on in the past. For instance, if you have worked on a cryptocurrency sentiment analysis project, you can discuss how you approached the problem, what methods you used, and any challenges you faced.

Highlighting your relevant experiences can show that you have practical experience in the field, and it can also demonstrate that you have an understanding of the challenges involved in working on real-world problems. Additionally, it can give the interviewer an insight into how you approach problems and how you have applied your knowledge to practical scenarios.

When discussing your past experiences, try to focus on the relevant aspects that relate to the current question. Highlight the key techniques, models, or algorithms that you used in your previous project and how they can be applied to the current problem. Also, explain any modifications or improvements you would make based on your previous experience.

However, if you do not have a relevant experience to draw from, do not worry. You can still approach the problem in a systematic way, draw on your theoretical knowledge, and showcase your ability to solve problems.


By following these steps, you can approach machine learning interview questions with confidence and provide thoughtful, well-reasoned answers. Remember, the goal is not necessarily to provide a perfect solution, but rather to demonstrate your thought process and problem-solving skills.