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use super::message::*;
pub struct PromptFormat<'a> {
pub bos_token: &'a str,
pub system_pre_message: &'a str,
pub system_post_message: &'a str,
pub user_pre_message: &'a str,
pub user_post_message: &'a str,
pub assistant_pre_message: &'a str,
pub assistant_post_message: &'a str,
}
pub const LLAMA2_PROMPT_FORMAT: PromptFormat<'static> = PromptFormat {
bos_token: "<s>",
system_pre_message: "[INST] <<SYS>>",
system_post_message: "<</SYS>> [/INST]",
user_pre_message: "[INST]",
user_post_message: "[/INST]",
assistant_pre_message: "",
assistant_post_message: "</s>",
};
pub const LLAMA3_PROMPT_FORMAT: PromptFormat<'static> = PromptFormat {
bos_token: "<|begin_of_text|>",
system_pre_message: "<|start_header_id|>system<|end_header_id|>\n\n",
system_post_message: "<|eot_id|>",
user_pre_message: "<|start_header_id|>user<|end_header_id|>\n\n",
user_post_message: "<|eot_id|>",
assistant_pre_message: "<|start_header_id|>assistant<|end_header_id|>\n\n",
assistant_post_message: "<|eot_id|>",
};
pub fn generate_prompt(messages: &[Message], format: PromptFormat) -> anyhow::Result<String> {
let PromptFormat {
bos_token,
system_pre_message,
system_post_message,
user_pre_message,
user_post_message,
assistant_pre_message,
assistant_post_message,
} = format;
let mut prompt = bos_token.to_string();
let mut image_urls = vec![];
for message in messages {
let role = &message.role;
let content = match &message.content {
MessageContent::Text(text) => text.clone(),
MessageContent::Array(list) => {
let mut parts = vec![];
for item in list {
match item {
MessageContentPart::Text { text } => parts.push(text.clone()),
MessageContentPart::ImageUrl {
image_url: ImageUrl { url },
} => {
image_urls.push(url.clone());
}
}
}
parts.join("\n\n")
}
};
match role {
MessageRole::System => prompt.push_str(&format!(
"{system_pre_message}{content}{system_post_message}"
)),
MessageRole::Assistant => prompt.push_str(&format!(
"{assistant_pre_message}{content}{assistant_post_message}"
)),
MessageRole::User => {
prompt.push_str(&format!("{user_pre_message}{content}{user_post_message}"))
}
}
}
if !image_urls.is_empty() {
anyhow::bail!("The model does not support images: {:?}", image_urls);
}
prompt.push_str(assistant_pre_message);
Ok(prompt)
}
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