Explore the intricacies of BigBird, a transformer model designed for longer sequences, in this informative 27-minute video lecture by Vasudev Gupta. Delve into the reasons behind the need for models like BigBird and Longformer, and understand their advantages over traditional BERT and RoBERTa models for tasks involving extended text. Learn about BigBird's implementation, compare its complexity to BERT, and discover when to opt for each model type. Gain practical insights on optimizing BigBird's performance using Hugging Face, and understand its superiority over Longformer. The lecture covers topics such as block sparse attention, token handling, code implementation, complexity analysis, training techniques, limitations, and support for various BigBird variants, including BigBird Pegasus.