Enum ChatFamily 

pub enum ChatFamily {
    ChatMl,
    Llama3,
    Gemma,
    Gemma4,
    None,
}

Chat-template family, detected from the special tokens a model’s vocab carries. Instruct models must have their prompt wrapped in this template (with an assistant-turn cue) or they degenerate (emit EOS immediately, or repeat) — a raw prompt gives the model no “your turn to answer” signal.

Variants

ChatMl

<|im_start|>role\n…<|im_end|> — Qwen2 / SmolLM2 / many instruct models.

Llama3

<|start_header_id|>role<|end_header_id|>\n\n…<|eot_id|> — Llama-3.x.

Gemma

<start_of_turn>role\n…<end_of_turn> — Gemma 1/2/3 (no system role).

Gemma4

<|turn>role\n…<turn|> — Gemma 4 instruct (also uses <|channel> tool channel).

None

No recognised chat specials — the raw prompt is used unchanged.

Trait Implementations

impl Clone for ChatFamily

fn clone(&self) -> ChatFamily

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChatFamily

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for ChatFamily

fn eq(&self, other: &ChatFamily) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ChatFamily

impl Eq for ChatFamily

impl StructuralPartialEq for ChatFamily