How to Test AI Applications? GenAI Evals, LLM-as-a-Judge & RAG Testing | FDE Full Course #17

FDE Full Course #17 How do you test an AI application when the model can give a different valid answer every time? In this video, we learn GenAI Evals and Testing from first principles and understand how modern AI applications are actually evaluated. Traditional software testing is usually deterministic: Same Input → Same Logic → Same Output But LLM applications are different. There may not be one exact correct sentence, so instead of testing exact output, we often need to test the behaviour and quality of the system. In this lecture, we cover: ✅ Why traditional testing is not enough for LLM applications ✅ What AI Evals actually are ✅ Deterministic software vs probabilistic AI systems ✅ Why “looks good to me” does not scale ✅ Evaluation datasets and golden datasets ✅ Normal cases, edge cases and adversarial test cases ✅ Deterministic evaluation ✅ Quality-based evaluation ✅ Relevance ✅ Correctness ✅ Faithfulness / Groundedness ✅ Helpfulness ✅ Hallucination ✅ LLM-as-a-Judge ✅ Structured judge outputs ✅ Pointwise vs Pairwise evaluation ✅ Evaluation rubrics ✅ Human evaluation ✅ RAG evaluation ✅ Retrieval evaluation vs response evaluation ✅ Offline evaluation ✅ Online evaluation ✅ How production failures improve your eval dataset We also connect everything to a practical customer-support RAG application so the concepts remain easy to understand. The key idea is simple: Traditional software asks: Did I get the exact expected output? AI evaluation asks: Did the system behave the way we expected? This lecture is part of the Forward Deployed Engineer (FDE) / Generative AI Series, where we are learning how real-world AI applications are designed, tested and improved. #GenerativeAI #AIEvals #LLM #LLMTesting #RAG #ArtificialIntelligence #GenAI #FDE #LLMAsAJudge #AITesting ------------------------------------------------------------------------------------------------------------- Code and Notes: Github : https://github.com/adityatandon15/Forward-Deployed-Engineer-Full-Course Spring Boot Full Course : https://youtube.com/playlist?list=PLEYgx5hMdopw&si=o1Njda0XgYXwg4xs JAVA Full Course Series : https://youtube.com/playlist?list=PLQEaRBV9gAFsR15tNo2QLF9d2qc-c018p&si=4qQP_euMTZMvAwNu Join our WhatsApp Group: https://www.whatsapp.com/channel/0029VbBF1XKF1YlMyYuPM23s We have paid courses on DSA, Web Development , Blockchain, System Design & GenAI. Join Courses: https://strikes.in/ Coder Army Website: https://coderarmy.in/#home Coder Army App: https://play.google.com/store/apps/details?id=com.rohit.negi Connect with Aditya Tandon Instagram : https://www.instagram.com/itsadityatandon LinkedIn : https://www.linkedin.com/in/adityatandon2 Twitter : https://x.com/adityatandon02 Timestamps: