Data Sutram Senior Data Scientist Interview Questions and Answers

2 questions based on coding

Q1. Reverse a string
Ans. 
Reverse a given string
• Use built-in functions like reverse() or slice() in Python

• Iterate through the string in reverse order and append each character to a new string

• Convert the string to an array of characters, reverse the array, then join the characters back together
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Q2. Linked list in java
Ans. 
A linked list is a data structure in Java where each element points to the next element in the list.
• Linked list nodes contain data and a reference to the next node

• Insertion and deletion operations are efficient in linked lists

• Traversal requires iterating through each node starting from the head

• Example: Node class with data and next pointer, LinkedList class with methods to insert, delete, and traverse
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Q1. What is over fitting
Ans. 
Overfitting occurs when a model learns the training data too well, leading to poor performance on new, unseen data.
• Overfitting occurs when a model is too complex and captures noise in the training data.

• It can be identified when a model performs well on training data but poorly on test data.

• Techniques to prevent overfitting include cross-validation, regularization, and early stopping.

• Example: A decision tree with too ma...read more
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