HMM Viterbi Algorithm Explained | Numerical Solution & Best State Sequence Solved Step-by-Step #nlp

In this video, we solve the Viterbi Algorithm in Hidden Markov Models (HMM) with a complete numerical example — step-by-step and exam-ready. This is one of the most important topics in Natural Language Processing (NLP) and is frequently asked in exams, viva, and interviews. 📌 What you’ll learn: • What is the Viterbi Algorithm (HMM Decoding Problem) • How to find the best hidden state sequence • Understanding δ (delta) and ψ (psi) clearly • Full breakdown of the 4 steps:  1. Initialization  2. Recursion (MAX, not SUM)  3. Termination  4. Backtracking • Complete solved numerical example • How to construct the Viterbi trellis table 💡 Key Concepts Covered: • Difference between Forward vs Viterbi Algorithm (VERY IMPORTANT) • Why Viterbi uses MAX instead of Σ (SUM) • How backtracking reconstructs the optimal path • Global vs local optimal decisions • Understanding path probability vs sequence probability 📊 Final Result from Example: Best Hidden State Sequence: 👉 Hot → Hot → Hot Best Path Probability: 👉 P = 0.012544* ⚠️ Important Exam Tip: Forward Algorithm → SUM (Σ) Viterbi Algorithm → MAX Mixing these two is the #1 mistake ❗ 🎯 This video is perfect for: • NLP students (Engineering / Mumbai University) • Data Science & ML learners • Interview preparation • Anyone struggling with HMM numericals 📌 Topics Covered: Hidden Markov Model, Viterbi Algorithm, HMM Numerical, Decoding Problem, Dynamic Programming, NLP Sequence Models __________________________________________ 🔀 Sorting:    • Sorting Algorithms | At A Glance!   🔍 Searching Algorithms:    • Searching Algorithms | At A Glance!   🔢 Arrays in Python:    • Arrays | At A Glance!   🧮 White Box Testing Numerical:    • White Box Testing | At A Glance!   📈 Big Data Analytics:    • Big Data Analytics | At A Glance!   Applied Data Science:    • Applied Data Science | At A Glance!   🤖 Deep Learning:    • Deep Learning | At A Glance!   Generative AI:    • Generative AI | At A Glance!   Natural Language Processing (NLP):    • Natural Language Processing | At A Glance!   Model Context Protocol (MCP):    • Model Context Protocol (MCP)   Text-2-SQL GenAI Project:    • Text-to-SQL Complete Project Tutorial | Ge...   🔗 Blockchain and DLT:    • Blockchain and DLT | At A Glance!   ❤️Heart Disease Prediction using Machine Learning Project:    • Heart Disease Prediction | End to End Mach...   100 Days of SQL:    • 100 Days of Decoding SQL | At A Glance!   🐍 Python Small Projects:    • Python Small Projects! | At A Glance!   Subscribe to At A Glance! Buy me a coffee: https://www.buymeacoffee.com/ataglanc... Join Telegram: https://t.me/ataglanceofficial Official Website: https://ataglanceofficial.netlify.com/ Follow me on Instagram:   / at_a_glance_official   __________________________________________