Top Questions for Machine Learning Interview Preparation

September 28, 2021

Do you think machine learning interviews are going to be the future way to examine a candidate and why?

We all have witnessed the growing adoption of technology in almost every sector. To make information and services more accessible to people the companies are adopting new-age technologies like Machine Learning and artificial intelligence. For providing the best to consumers a company needs the best employees. Machine Learning job aspirants have to go through a rigorous Machine Learning interview process where they are judged on various aspects such as technical and programming skills, concept clarity, and knowledge of methods. To stand out of the crowd and crack Machine Learning interview questions read the helpful tips given below. They will surely help you in Machine Learning interview preparation.


18 Question and answers for machine learning interview preparation

Q.1 Why was machine learning introduced?

The main motto behind this is to make our life effortless. Gone are the days where “if” and “else” were used in coding to make decisions. The algorithms used in machine learning assist computer systems to improve their performance. Machine Learning has enabled us to use ample information for the info to find out and identify the patterns from the info.

Q.2 What do you understand by machine learning?

It is a branch of artificial intelligence and computer science that emphasizes the use of algorithms and data to imitate the way that humans learn and improve its accuracy. It is built based on brain cell interaction in the human body. It deals with system programming and automates data analysis by enabling computers to learn and act through experiences without being programmed.

Q.3 What are different types of machine learning algorithms?

The machine learning algorithm is broadly divided into Supervised, unsupervised, and reinforcement.
The supervised is task-driven and sub-divided as classification, regression, and ranking.
Unsupervised is data-driven and categorized as clustering, segmentation, associate mining, and dimension reduction.
Reinforcement is the way to learn and react to an environment further divided as a reward system, decision process, and recommendation system.

Q.4 What is the difference between processing and machine learning?

Data mining refers to the process in which the assembled and structured data tries to abstract knowledge or interesting unknown patterns. Machine Learning algorithms are used for data processing. While Machine Learning is the study, development, and designing of algorithms that provide the ability to the processors to learn instead of being explicitly programmed.

Q.5 What is supervised learning?

During supervised Machine Learning labeled data is used to train a machine. By giving a new dataset to the learning model the algorithm provides a positive outcome by analyzing that labeled data. This learning focus on the algorithm of inferring a function from labeled training data. The training data comprises a set of training examples.

Q.6 What is unsupervised learning?

This machine-learning algorithm is used to find patterns on the set of given data. No dependent variable or label to predict is present in unsupervised learning. Unsupervised Learning Algorithms comprise Clustering, Neutral networks, and latent variable models, and Anomaly Detection. In this technique, the user need not supervise the model.

Q.7 What are the functions of supervised learning?

Supervised learning focuses on classification, regression, speech recognition, prediction time series, and annotate strings. It allows to collect data and produce output based on the previous data. It also solves real-world problems and optimizes the performance criteria.

Q.8 What are the functions of unsupervised learning?

Unsupervised learning emphasizes a collection of data, finding its low-dimension representation, locating interesting directions, novel observation, database cleaning, and finding out interesting correlations and coordinates. It also determines the unknown patterns in the data.

Q.9 What is the meaning of overfitting in machine learning?

A random error or noise that occurs during describing a statistical model instead of an underlying relationship is termed as Overfitting in Machine Learning. It is generally observed when a model is excessively compound. The major reason behind this having too many parameters concerning the number of training data types.

Q.10 Why overfitting occurs?

There is a very high probability of overfitting when the criteria used for training the model and the criteria used to judge the efficiency of a model differs.

Q.11 What is the method to avoid overfitting?

Overfitting are often avoided by employing a great deal of knowledge. But when the database is small and forced to build a model based on that then another technique named cross-validation is used.

Q.12 How is KNN different from k-means clustering?

In KNN, a test sample is provided as the class of the maximum of its nearest neighbors. While in K-means an unsupervised algorithm is mainly used for clustering. K-means may be a set of unlabeled points and a threshold.

Q.13 What is ‘Naive’ in the naive bayes theorem?

Naive Bayes is more simplified from Bayes’ theorem. It is used as a distribution of algorithms for binary multi-class problems. It is also referred to as naive because it makes very important but quite unreal assumptions.

Q.14 What are the various sorts of algorithm methods in machine learning?

Reinforcement Learning
Supervised Learning
Semi-supervised Learning
Unsupervised Learning

Q.15 What do you understand by the reinforcement learning technique?

This algorithm technique used in machine learning involves an agent that interacts with its environment by producing actions & discovering rewards or errors. It is applied by different software and machines to discover the best suitable behavior or path to follow in a specific situation.

Q.16 What are the common ways to handle missing data during a dataset?

It is one of the standard factors that help in working with data and handling. For data analysts, it is considered one of the greatest challenges. The different ways to impute the missing values include assigning a unique category, using algorithms that support missing values, deleting the rows, replacing with mean/median/mode, predicting the missing values, etc.

Q.17 What does one understand by decision tree in machine Learning?

It is defined as supervised machine learning in which the data is continuously divided according to a certain specific parameter. The classification or regression models are built similar to a tree structure. The datasets get broken up into smaller subsets while developing the decision tree. The tree has two entities namely decision nodes and leaves.

Q.18 What do you understand by cluster sampling?

It is a process of randomly learning intact groups within an outlined population then sharing similar characteristics. Each sampling unit in this is a collection or cluster of elements.

The above-mentioned machine learning interview questions will help you grab your dream job. If you are looking forward to becoming a data scientist, machine learning engineer, artificial intelligence engineer, etc. then these questions for machine learning interview preparation will be of great help.