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fix: pydantic issues with langchain chat prompt and allow additional … #126

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merged 1 commit into from
Sep 26, 2024
Merged

fix: pydantic issues with langchain chat prompt and allow additional … #126

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33 changes: 23 additions & 10 deletions literalai/prompt_engineering/prompt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
from typing import TYPE_CHECKING, Any, Dict, List, Literal, Optional

import chevron
from pydantic import Field
from typing_extensions import TypedDict, deprecated

if TYPE_CHECKING:
Expand Down Expand Up @@ -162,7 +163,7 @@ def format_messages(self, **kwargs: Any) -> List[Any]:
def format(self, variables: Optional[Dict[str, Any]] = None) -> List[Any]:
return self.format_messages(**(variables or {}))

def to_langchain_chat_prompt_template(self):
def to_langchain_chat_prompt_template(self, additional_messages=[]):
try:
version("langchain")
except Exception:
Expand All @@ -185,9 +186,11 @@ def to_langchain_chat_prompt_template(self):
)

class CustomChatPromptTemplate(ChatPromptTemplate):
orig_messages: Optional[List[GenerationMessage]]
default_vars: Optional[Dict] = None
prompt_id: Optional[str]
orig_messages: Optional[List[GenerationMessage]] = Field(
default_factory=list
)
default_vars: Optional[Dict] = Field(default_factory=dict)
prompt_id: Optional[str] = None

def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
variables_with_defaults = {
Expand All @@ -198,10 +201,19 @@ def format_messages(self, **kwargs: Any) -> List[BaseMessage]:
rendered_messages: List[BaseMessage] = []

for index, message in enumerate(self.messages):
template = message.prompt.template # type: ignore
content = html.unescape(
chevron.render(template, variables_with_defaults)
)
content: str = ""
try:
prompt = getattr(message, "prompt") # type: ignore
content = html.unescape(
chevron.render(prompt.template, variables_with_defaults)
)
except AttributeError:
for m in ChatPromptTemplate.from_messages(
[message]
).format_messages():
rendered_messages.append(m)
continue

additonal_kwargs = {}
if self.orig_messages and index < len(self.orig_messages):
additonal_kwargs = {
Expand Down Expand Up @@ -240,8 +252,9 @@ async def aformat_messages(self, **kwargs: Any) -> List[BaseMessage]:

lc_messages = [(m["role"], m["content"]) for m in self.template_messages]

chat_template = CustomChatPromptTemplate.from_messages(lc_messages)
chat_template.input_variables = ["agent_scratchpad"]
chat_template = CustomChatPromptTemplate.from_messages(
lc_messages + additional_messages
)
chat_template.default_vars = self.variables_default_values
chat_template.orig_messages = self.template_messages
chat_template.prompt_id = self.id
Expand Down
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