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