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104 lines
3.4 KiB
Python
104 lines
3.4 KiB
Python
"""Load prompts from disk."""
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import json
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from pathlib import Path
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from typing import Union
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import yaml
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from langchain.prompts.base import BasePromptTemplate
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from langchain.prompts.few_shot import FewShotPromptTemplate
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from langchain.prompts.prompt import PromptTemplate
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def load_prompt_from_config(config: dict) -> BasePromptTemplate:
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"""Get the right type from the config and load it accordingly."""
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prompt_type = config.pop("_type", "prompt")
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if prompt_type == "prompt":
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return _load_prompt(config)
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elif prompt_type == "few_shot":
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return _load_few_shot_prompt(config)
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else:
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raise ValueError
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def _load_template(var_name: str, config: dict) -> dict:
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"""Load template from disk if applicable."""
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# Check if template_path exists in config.
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if f"{var_name}_path" in config:
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# If it does, make sure template variable doesn't also exist.
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if var_name in config:
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raise ValueError(
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f"Both `{var_name}_path` and `{var_name}` cannot be provided."
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)
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# Pop the template path from the config.
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template_path = Path(config.pop(f"{var_name}_path"))
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# Load the template.
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if template_path.suffix == ".txt":
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with open(template_path) as f:
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template = f.read()
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else:
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raise ValueError
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# Set the template variable to the extracted variable.
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config[var_name] = template
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return config
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def _load_examples(config: dict) -> dict:
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"""Load examples if necessary."""
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if isinstance(config["examples"], list):
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pass
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elif isinstance(config["examples"], str):
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with open(config["examples"]) as f:
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examples = json.load(f)
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config["examples"] = examples
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else:
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raise ValueError
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return config
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def _load_few_shot_prompt(config: dict) -> FewShotPromptTemplate:
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"""Load the few shot prompt from the config."""
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# Load the suffix and prefix templates.
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config = _load_template("suffix", config)
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config = _load_template("prefix", config)
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# Load the example prompt.
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if "example_prompt_path" in config:
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if "example_prompt" in config:
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raise ValueError(
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"Only one of example_prompt and example_prompt_path should "
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"be specified."
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)
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config["example_prompt"] = load_prompt(config.pop("example_prompt_path"))
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else:
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config["example_prompt"] = _load_prompt(config["example_prompt"])
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# Load the examples.
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config = _load_examples(config)
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return FewShotPromptTemplate(**config)
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def _load_prompt(config: dict) -> PromptTemplate:
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"""Load the prompt template from config."""
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# Load the template from disk if necessary.
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config = _load_template("template", config)
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return PromptTemplate(**config)
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def load_prompt(file: Union[str, Path]) -> BasePromptTemplate:
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"""Load prompt from file."""
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# Convert file to Path object.
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if isinstance(file, str):
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file_path = Path(file)
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else:
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file_path = file
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# Load from either json or yaml.
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if file_path.suffix == ".json":
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with open(file_path) as f:
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config = json.load(f)
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elif file_path.suffix == ".yaml":
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with open(file_path, "r") as f:
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config = yaml.safe_load(f)
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else:
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raise ValueError
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# Load the prompt from the config now.
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return load_prompt_from_config(config)
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