Fourth Industrial Revolution

Summary : Learn that you can use Promptfoo to test and evaluate Large Language Models (LLMs) responses, AI agents, and Retrieval-Augmented Generation (RAG) applications. This guide explains traditional software testing versus AI evaluation, Promptfoo's core components, assertion types, installation, configuration, and how to run your first evaluation. Introduction: Why AI Applications Need a Different Testing Approach Traditional software testing has well-established techniques for validating application behavior. You provide an input, execute the application, and compare the actual output with the expected result. This approach works well for deterministic systems, such as REST APIs, database operations, and conventional business logic. AI-powered applications introduce a different set of challenges. An LLM may express the same answer in several ways, an AI agent may select an unexpected tool, and a Retrieval-Augmented Generation (RAG) application may produce a convincing an...

Summary : Practice SQL for data engineering with DuckDB and a small network-traffic dataset. This hands-on example covers table creation, filtering, joins, aggregations, window functions, Pandas and SQL result checks, data-quality rules, and a Parquet round trip. SQL is a core tool for data engineers. It helps us explore source data, transform records, build analytical datasets, and check whether pipeline outputs are correct. You do not need to set up a separate database server to practice these patterns. With DuckDB, you can run analytical SQL directly from Python in a Kaggle notebook. In this exercise, we use a small CSV containing network events. Each row includes a timestamp, source IP, destination IP, port, protocol, bytes sent, and event duration. The goal is not just to write queries, but to follow a simple engineering workflow: ingest the data, inspect it, transform it, validate it, and save a verified output. Run the hands-on notebook: Data Engineering Interview Prepara...

Summary : Start your Data Engineering interview preparation with a practical Kaggle notebook covering Python, Pandas, SQL, DuckDB, data validation and Python/SQL result verification. If you are preparing for a Data Engineering interview, knowing Python and SQL syntax is only the beginning. You also need to understand how data moves through a workflow, how transformations are validated, and how to explain your technical decisions clearly. That is the purpose of Data Engineering Interview Preparation #1 , the first practical asset in my progressive Data Engineering interview-preparation series. This notebook is designed to give learners a low-friction starting point. It uses the Kaggle notebook environment and a small Sales Transactions dataset to connect Python, Pandas and SQL through practical examples. What You Will Learn In this first notebook , you will practice: Python variables and basic data types Lists, indexing, slicing and mutation Dictionaries and nested dicti...