SurveySparrow ml engineer Interview Questions and Answers

Q1. Questions related to college projects.
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Q1. What is linear regression
Ans. 
Linear regression is a statistical method used to model the relationship between a dependent variable and one or more independent variables.
• Linear regression aims to find the best-fitting straight line that describes the relationship between variables.

• It is commonly used for predicting numerical values based on input features.

• The equation for a simple linear regression model is y = mx + b, where y is the dependent vari...read more
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Q2. What is support vector machine
Ans. 
Support Vector Machine (SVM) is a supervised machine learning algorithm used for classification and regression tasks.
• SVM finds the hyperplane that best separates different classes in the feature space

• It works by maximizing the margin between the closest data points from different classes

• SVM can handle non-linear data by using kernel functions to map data into higher-dimensional space

• Examples: classifying emails as spam...read more
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Q1. What is difference between object detection and segmentation in image
Ans. 
Object detection identifies objects in an image, while segmentation assigns a label to each pixel in the image.
• Object detection involves identifying and locating objects within an image, often using bounding boxes.

• Segmentation assigns a class label to each pixel in the image, creating a pixel-wise mask for each object.

• Object detection is typically used when the goal is to identify and locate multiple objects in an imag...read more
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Q2. Technology used in camera sensor
Ans. 
Camera sensors use various technologies such as CMOS and CCD to capture images.
• CMOS (Complementary Metal-Oxide-Semiconductor) sensors are commonly used in modern digital cameras for their low power consumption and high image quality.

• CCD (Charge-Coupled Device) sensors are another type of sensor used in some cameras, known for their high-quality images but higher power consumption.

• Other technologies used in camera senso...read more
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Q1. Tell about sql joins
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

• F...read more
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Q2. What ks difference between delete and update
Ans. 
Delete removes a record entirely, while update modifies an existing record.
• Delete removes the entire record from the database

• Update modifies specific fields of an existing record

• Delete is irreversible, while update can be undone by another update

• Example: Deleting a user account vs updating the user's email address
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Create a Full Stack App

There were 2 questions, it was an online round with timer. One question was on arrays and other on strings

2 coding questions to solve, one logical and another on strings. Some mysql related questions were asked.

Q1. Some questions of OOPS concept
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Q2. Some on data structures
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Q1. Soft skills with examples
Ans. 
Soft skills are essential for a Software Engineer to effectively communicate, collaborate, and problem-solve.
• Effective communication: Ability to clearly convey ideas and information to team members and stakeholders.

• Collaboration: Working well with others to achieve common goals and contribute positively to team dynamics.

• Problem-solving: Using critical thinking and creativity to identify and solve complex technical issu...read more
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2 Medium level DSA question

Q1. Mirror binary tree
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Q2. Optimally find n^m
Ans. 
Use the exponentiation by squaring algorithm to optimally find n^m.
• Use the exponentiation by squaring algorithm to reduce the number of multiplications needed.

• Divide the exponent by 2 and recursively calculate the result.

• Handle the cases when the exponent is even or odd separately.

• Example: n^5 = n * n^2 * n^2
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Q1. Edit distance problem
Ans. 
The edit distance problem involves finding the minimum number of operations required to transform one string into another.
• The edit distance problem can be solved using dynamic programming.

• Common operations include insertion, deletion, and substitution of characters.

• Example: Given strings 'kitten' and 'sitting', the edit distance is 3 (substitute 'k' with 's', insert 'g', substitute 'n' with 'g').
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Q2. Light switch puzzle
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Q1. DSA question (Competitive programming)
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Q2. LLD question (Competetive)
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