Source code for langchain_experimental.pal_chain.base
"""Implements Program-Aided Language Models.
This module implements the Program-Aided Language Models (PAL) for generating code
solutions. PAL is a technique described in the paper "Program-Aided Language Models"
(https://arxiv.org/pdf/2211.10435.pdf).
"""
from __future__ import annotations
import ast
from typing import Any, Dict, List, Optional
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain.schema.language_model import BaseLanguageModel
from langchain.utilities import PythonREPL
from langchain_experimental.pal_chain.colored_object_prompt import COLORED_OBJECT_PROMPT
from langchain_experimental.pal_chain.math_prompt import MATH_PROMPT
from langchain_experimental.pydantic_v1 import Extra, Field
COMMAND_EXECUTION_FUNCTIONS = ["system", "exec", "execfile", "eval", "__import__"]
[docs]class PALValidation:
    SOLUTION_EXPRESSION_TYPE_FUNCTION = ast.FunctionDef
    SOLUTION_EXPRESSION_TYPE_VARIABLE = ast.Name
[docs]    def __init__(
        self,
        solution_expression_name: Optional[str] = None,
        solution_expression_type: Optional[type] = None,
        allow_imports: bool = False,
        allow_command_exec: bool = False,
    ):
        """Initialize a PALValidation instance.
        Args:
            solution_expression_name (str): Name of the expected solution expression.
                If passed, solution_expression_type must be passed as well.
            solution_expression_type (str): AST type of the expected solution
                expression. If passed, solution_expression_name must be passed as well.
                Must be one of PALValidation.SOLUTION_EXPRESSION_TYPE_FUNCTION,