Start of Sequence (SOS) Token

Formal Definition of LLM Inference

A user provides the input 'Summarize this article', which a language model processes into three distinct tokens ('Summarize', 'this', 'article'). Based on the formal structure where an input sequence is represented by its tokens plus a special start symbol, what is the total number of tokens in the complete sequence given to the model?

A language model receives an input prompt that is tokenized into 10 tokens. According to the formal representation of an input sequence, $\mathbf{x} = x_0...x_m$, which of the following correctly describes the structure of the complete sequence processed by the model?

A language model is given the complete input token sequence: $\mathbf{x} = [⟨SOS⟩, \text{'What'}, \text{'is'}, \text{'the'}, \text{'capital'}, \text{'of'}, \text{'France'}, \text{'?'} ]$. By analyzing the components of this sequence, identify which token's primary role is to signal the beginning of the input context for the model.