10+ EWNS Holidays Interview Questions and Answers

PCA is a dimensionality reduction technique, decision tree is a classification algorithm, and computer vision is a field of study focused on enabling computers to interpret and understand visual information.

• PCA is used to reduce the number of variables in a dataset while retaining the most important information.

• Decision trees are used to classify data based on a set of rules and conditions.

• Computer vision involves using algorithms and techniques to enable computers to interpr...read more

Utilized advanced SQL queries for data analysis, aggregation, and reporting in various projects.

• Used Common Table Expressions (CTEs) for recursive queries to analyze hierarchical data.

• Implemented window functions like ROW_NUMBER() and RANK() for ranking patients based on their treatment outcomes.

• Executed complex JOIN operations to merge data from multiple tables, enhancing data insights.

• Applied subqueries for filtering datasets, such as finding patients with above-average tes...read more

Hyperparameters in random forest are parameters that are set before the learning process begins.

• Hyperparameters control the behavior of the random forest algorithm.

• They are set by the data scientist and are not learned from the data.

• Examples of hyperparameters in random forest include the number of trees, the maximum depth of trees, and the number of features considered at each split.

Python is a high-level programming language known for its simplicity and readability.

• Python is widely used for web development, data analysis, artificial intelligence, and scientific computing.

• It emphasizes code readability and uses indentation for block delimiters.

• Python has a large standard library and a vibrant community of developers.

• Example: print('Hello, World!')

• Example: import pandas as pd

Code problems refer to issues or errors in the code that need to be identified and fixed.

• Code problems can include syntax errors, logical errors, or performance issues.

• Examples of code problems include missing semicolons, incorrect variable assignments, or inefficient algorithms.

• Identifying and resolving code problems is a key skill for data scientists to ensure accurate and efficient data analysis.

Python code is a programming language used for data analysis, machine learning, and scientific computing.

• Python code is written in a text editor or an integrated development environment (IDE)

• Python code is executed using a Python interpreter

• Python code can be used for data manipulation, visualization, and modeling

The question seems to be incomplete or misspelled.

• It is possible that the interviewer made a mistake while asking the question.

• Ask for clarification or context to provide a relevant answer.

A QnA system with LLM is a system that uses the Language Model for Information Retrieval and Question Answering.

• Preprocess the input question and convert it into a format suitable for the LLM model.

• Fine-tune the LLM model on a dataset of question-answer pairs.

• Use the fine-tuned model to generate answers for new questions.

• Evaluate the performance of the QnA system using metrics like precision, recall, and F1 score.

• Iteratively improve the system by refining the training data an...read more

Designing conversational flow involves structuring dialogue for clarity, engagement, and user satisfaction.

• Define user goals: Understand what users want to achieve, e.g., booking an appointment.

• Map out conversation paths: Create flowcharts to visualize possible dialogues.

• Use natural language: Ensure the bot understands and responds in a human-like manner.

• Incorporate error handling: Plan for misunderstandings and provide fallback options.

• Test and iterate: Continuously refine t...read more

Unit testing is a process of testing individual units of code to ensure they function correctly.

• Write test cases for each unit of code

• Test inputs, outputs, and edge cases

• Use testing frameworks like JUnit or pytest

• Automate tests to run regularly

• Ensure tests are independent, isolated, and repeatable

Window functions in SQL allow for performing calculations across a set of table rows related to the current row.

• Window functions operate on a set of rows defined by an OVER() clause.

• They do not change the number of rows returned by a query.

• Common window functions include ROW_NUMBER(), RANK(), and SUM().

• Example: SELECT name, salary, RANK() OVER (ORDER BY salary DESC) AS rank FROM employees;

• Window functions can be partitioned using PARTITION BY to group results.