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48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
"""Prompt schema definition."""
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from typing import Any, Dict, List
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from pydantic import BaseModel, Extra, root_validator
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from langchain.formatting import formatter
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_FORMATTER_MAPPING = {
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"f-string": formatter.format,
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}
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class Prompt(BaseModel):
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"""Schema to represent a prompt for an LLM."""
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input_variables: List[str]
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template: str
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template_format: str = "f-string"
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class Config:
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"""Configuration for this pydantic object."""
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extra = Extra.forbid
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def format(self, **kwargs: Any) -> str:
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"""Format the prompt with the inputs."""
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return _FORMATTER_MAPPING[self.template_format](self.template, **kwargs)
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@root_validator()
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def template_is_valid(cls, values: Dict) -> Dict:
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"""Check that template and input variables are consistent."""
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input_variables = values["input_variables"]
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template = values["template"]
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template_format = values["template_format"]
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if template_format not in _FORMATTER_MAPPING:
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valid_formats = list(_FORMATTER_MAPPING)
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raise ValueError(
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f"Invalid template format. Got `{template_format}`;"
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f" should be one of {valid_formats}"
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)
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dummy_inputs = {input_variable: "foo" for input_variable in input_variables}
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try:
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formatter_func = _FORMATTER_MAPPING[template_format]
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formatter_func(template, **dummy_inputs)
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except KeyError:
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raise ValueError("Invalid prompt schema.")
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return values
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