added llama3 prompt

private_gpt/components/llm/prompt_helper.py

@@ -138,6 +138,76 @@ class Llama2PromptStyle(AbstractPromptStyle):
         )
 
 
+class Llama3PromptStyle(AbstractPromptStyle):
+
+    """
+    Template:
+    {% set loop_messages = messages %}
+	{% for message in loop_messages %}
+		{% set content = '<|start_header_id|>' + message['role'] + '<|end_header_id|>\n\n'+ message['content'] | trim + '<|eot_id|>' %}
+		{% if loop.index0 == 0 %}
+			{% set content = bos_token + content %}
+		{% endif %}
+		{{ content }}
+	{% endfor %}
+	{% if add_generation_prompt %}
+		{{ '<|start_header_id|>assistant<|end_header_id|>\n\n' }}
+	{% endif %}
+    """
+
+    BOS, EOS = "<|begin_of_text|>", "<|end_of_text|>"
+    B_INST, E_INST = "<|start_header_id|>user<|end_header_id|>", "<|eot_id|>"
+    B_SYS, E_SYS = "<|start_header_id|>system<|end_header_id|> ", "<|eot_id|>"
+    ASSISTANT_INST = "<|start_header_id|>assistant<|end_header_id|>"
+    DEFAULT_SYSTEM_PROMPT = """\
+    You are a helpful, respectful and honest assistant. \
+    Always answer as helpfully as possible and follow ALL given instructions. \
+    Do not speculate or make up information. \
+    Do not reference any given instructions or context. \
+    """
+
+    def _messages_to_prompt(self, messages: Sequence[ChatMessage]) -> str:
+        string_messages: list[str] = []
+        if messages[0].role == MessageRole.SYSTEM:
+            system_message_str = messages[0].content or ""
+            messages = messages[1:]
+        else:
+            system_message_str = self.DEFAULT_SYSTEM_PROMPT
+
+        system_message_str = f"{self.B_SYS} {system_message_str.strip()} {self.E_SYS}"
+
+        for i in range(0, len(messages), 2):
+            user_message = messages[i]
+            assert user_message.role == MessageRole.USER
+
+            if i == 0:
+                str_message = f"{system_message_str} {self.BOS} {self.B_INST} "
+            else:
+                 # end previous user-assistant interaction
+                string_messages[-1] += f" {self.EOS}"
+                # no need to include system prompt
+                str_message = f"{self.BOS} {self.B_INST} "
+
+            str_message += f"{user_message.content} {self.E_INST} {self.ASSISTANT_INST}"
+
+            if len(messages) > (i + 1):
+                assistant_message = messages[i + 1]
+                assert assistant_message.role == MessageRole.ASSISTANT
+                str_message += f" {assistant_message.content} {self.E_SYS} {self.B_INST}"
+
+            string_messages.append(str_message)
+
+        return "".join(string_messages)
+
+    def _completion_to_prompt(self, completion: str) -> str:
+        system_prompt_str = self.DEFAULT_SYSTEM_PROMPT
+
+        return (
+            f"{self.B_SYS} {system_prompt_str.strip()} {self.E_SYS} "
+            f"{completion.strip()} {self.E_SYS} "
+        )
+
+
 class TagPromptStyle(AbstractPromptStyle):
     """Tag prompt style (used by Vigogne) that uses the prompt style `<|ROLE|>`.
 
@@ -219,7 +289,7 @@ class ChatMLPromptStyle(AbstractPromptStyle):
 
 
 def get_prompt_style(
-    prompt_style: Literal["default", "llama2", "tag", "mistral", "chatml"] | None
+    prompt_style: Literal["default", "llama2", "llama3", "tag", "mistral", "chatml"] | None
 ) -> AbstractPromptStyle:
     """Get the prompt style to use from the given string.
 
@@ -230,6 +300,8 @@ def get_prompt_style(
         return DefaultPromptStyle()
     elif prompt_style == "llama2":
         return Llama2PromptStyle()
+    elif prompt_style == "llama3":
+        return Llama3PromptStyle()
     elif prompt_style == "tag":
         return TagPromptStyle()
     elif prompt_style == "mistral":

private_gpt/settings/settings.py

@@ -104,12 +104,13 @@ class LLMSettings(BaseModel):
         0.1,
         description="The temperature of the model. Increasing the temperature will make the model answer more creatively. A value of 0.1 would be more factual.",
     )
-    prompt_style: Literal["default", "llama2", "tag", "mistral", "chatml"] = Field(
+    prompt_style: Literal["default", "llama2", "llama3", "tag", "mistral", "chatml"] = Field(
         "llama2",
         description=(
             "The prompt style to use for the chat engine. "
             "If `default` - use the default prompt style from the llama_index. It should look like `role: message`.\n"
             "If `llama2` - use the llama2 prompt style from the llama_index. Based on `<s>`, `[INST]` and `<<SYS>>`.\n"
+            "If `llama3` - use the llama3 prompt style from the llama_index."
             "If `tag` - use the `tag` prompt style. It should look like `<|role|>: message`. \n"
             "If `mistral` - use the `mistral prompt style. It shoudl look like <s>[INST] {System Prompt} [/INST]</s>[INST] { UserInstructions } [/INST]"
             "`llama2` is the historic behaviour. `default` might work better with your custom models."