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core[minor]: Init ChatPromptTemplate with message-like representations #16851

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core[minor]: Init ChatPromptTemplate with message-like representations #16851

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97 changes: 58 additions & 39 deletions libs/core/langchain_core/prompts/chat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -593,6 +593,24 @@ class ChatPromptTemplate(BaseChatPromptTemplate):
validate_template: bool = False
"""Whether or not to try validating the template."""

def __init__(
self,
messages: Sequence[MessageLikeRepresentation],
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Could we put a * here so that only messages can be passed by position

input_variables: Optional[Sequence[str]] = None,
**kwargs: Any,
) -> None:
_messages = [_convert_to_message(msg) for msg in messages]
if input_variables is None:
prompts = [
msg
for msg in _messages
if isinstance(msg, (BaseChatPromptTemplate, BaseMessagePromptTemplate))
]
input_variables = list(
set(iv for prompt in prompts for iv in prompt.input_variables)
)
super().__init__(messages=_messages, input_variables=input_variables, **kwargs)

@classmethod
def get_lc_namespace(cls) -> List[str]:
"""Get the namespace of the langchain object."""
Expand Down Expand Up @@ -677,45 +695,9 @@ def from_template(cls, template: str, **kwargs: Any) -> ChatPromptTemplate:
message = HumanMessagePromptTemplate(prompt=prompt_template)
return cls.from_messages([message])

@classmethod
@deprecated("0.0.260", alternative="from_messages classmethod", pending=True)
def from_role_strings(
cls, string_messages: List[Tuple[str, str]]
) -> ChatPromptTemplate:
"""Create a chat prompt template from a list of (role, template) tuples.

Args:
string_messages: list of (role, template) tuples.

Returns:
a chat prompt template
"""
return cls(
messages=[
ChatMessagePromptTemplate.from_template(template, role=role)
for role, template in string_messages
]
)

@classmethod
@deprecated("0.0.260", alternative="from_messages classmethod", pending=True)
def from_strings(
cls, string_messages: List[Tuple[Type[BaseMessagePromptTemplate], str]]
) -> ChatPromptTemplate:
"""Create a chat prompt template from a list of (role class, template) tuples.

Args:
string_messages: list of (role class, template) tuples.

Returns:
a chat prompt template
"""
return cls.from_messages(string_messages)

@classmethod
def from_messages(
cls,
messages: Sequence[MessageLikeRepresentation],
cls, messages: Sequence[MessageLikeRepresentation], **kwargs: Any
) -> ChatPromptTemplate:
"""Create a chat prompt template from a variety of message formats.

Expand Down Expand Up @@ -747,21 +729,23 @@ def from_messages(
(message type, template); e.g., ("human", "{user_input}"),
(4) 2-tuple of (message class, template), (4) a string which is
shorthand for ("human", template); e.g., "{user_input}"
**kwargs: Additional keyword arguments to pass to ChatPromptTemplate
constructor.

Returns:
a chat prompt template
"""
_messages = [_convert_to_message(message) for message in messages]

# Automatically infer input variables from messages
input_vars: Set[str] = set()
input_vars: Set[str] = kwargs.pop("input_variables", set())
for _message in _messages:
if isinstance(
_message, (BaseChatPromptTemplate, BaseMessagePromptTemplate)
):
input_vars.update(_message.input_variables)

return cls(input_variables=sorted(input_vars), messages=_messages)
return cls(input_variables=sorted(input_vars), messages=_messages, **kwargs)

def format(self, **kwargs: Any) -> str:
"""Format the chat template into a string.
Expand Down Expand Up @@ -887,6 +871,41 @@ def pretty_repr(self, html: bool = False) -> str:
# TODO: handle partials
return "\n\n".join(msg.pretty_repr(html=html) for msg in self.messages)

@classmethod
@deprecated("0.0.260", alternative="from_messages classmethod", pending=True)
def from_role_strings(
cls, string_messages: List[Tuple[str, str]]
) -> ChatPromptTemplate:
"""Create a chat prompt template from a list of (role, template) tuples.

Args:
string_messages: list of (role, template) tuples.

Returns:
a chat prompt template
"""
return cls(
messages=[
ChatMessagePromptTemplate.from_template(template, role=role)
for role, template in string_messages
]
)

@classmethod
@deprecated("0.0.260", alternative="from_messages classmethod", pending=True)
def from_strings(
cls, string_messages: List[Tuple[Type[BaseMessagePromptTemplate], str]]
) -> ChatPromptTemplate:
"""Create a chat prompt template from a list of (role class, template) tuples.

Args:
string_messages: list of (role class, template) tuples.

Returns:
a chat prompt template
"""
return cls.from_messages(string_messages)


def _create_template_from_message_type(
message_type: str, template: Union[str, list]
Expand Down
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