The Untold Secrets of FFN in Transformers

Transformers changed the entire world of AI — but there is one component almost everyone ignores: the Feed Forward Neural Network (FFN). In this video, I break down WHAT the FFN is, WHY it exists in every transformer layer, and HOW it works internally with a full step-by-step example. We will cover: • What is the Feed Forward Network (FFN) in Transformers • Why Transformers need FFN after multi-head attention • How FFN expands and compresses embeddings • Role of activation functions ( ReLU) • Why FFN uses shared weights • How FFN processes every token in parallel • Complete numeric example (3…