Hello everyone, I’m trying to learn more about language modeling using huggingface, and how some problems can be modeled as a language to train a model to predict the next token in an arbitrary sequence. In this huggingface tutorial, they mention the use of a [BOS token]. Why is this needed? Does a causal language model need tokens to denote when a sequence begins and ends? What might happen if tokens like this are not included in the training dataset? Will this significantly affect the ability of the model to generate sequences that begin and end properly?