mirror of
https://github.com/hwchase17/langchain
synced 2024-10-29 17:07:25 +00:00
264 lines
8.7 KiB
Python
264 lines
8.7 KiB
Python
from __future__ import annotations # allows pydantic model to reference itself
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import re
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from typing import Any, List, Optional, Union
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from langchain.graphs.networkx_graph import NetworkxEntityGraph
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from langchain_experimental.cpal.constants import Constant
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from langchain_experimental.pydantic_v1 import (
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BaseModel,
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Field,
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PrivateAttr,
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root_validator,
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validator,
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)
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class NarrativeModel(BaseModel):
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"""
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Represent the narrative input as three story elements.
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"""
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story_outcome_question: str
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story_hypothetical: str
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story_plot: str # causal stack of operations
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@validator("*", pre=True)
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def empty_str_to_none(cls, v: str) -> Union[str, None]:
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"""Empty strings are not allowed"""
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if v == "":
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return None
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return v
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class EntityModel(BaseModel):
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name: str = Field(description="entity name")
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code: str = Field(description="entity actions")
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value: float = Field(description="entity initial value")
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depends_on: List[str] = Field(default=[], description="ancestor entities")
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# TODO: generalize to multivariate math
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# TODO: acyclic graph
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class Config:
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validate_assignment = True
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@validator("name")
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def lower_case_name(cls, v: str) -> str:
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v = v.lower()
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return v
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class CausalModel(BaseModel):
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attribute: str = Field(description="name of the attribute to be calculated")
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entities: List[EntityModel] = Field(description="entities in the story")
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# TODO: root validate each `entity.depends_on` using system's entity names
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class EntitySettingModel(BaseModel):
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"""
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Initial conditions for an entity
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{"name": "bud", "attribute": "pet_count", "value": 12}
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"""
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name: str = Field(description="name of the entity")
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attribute: str = Field(description="name of the attribute to be calculated")
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value: float = Field(description="entity's attribute value (calculated)")
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@validator("name")
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def lower_case_transform(cls, v: str) -> str:
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v = v.lower()
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return v
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class SystemSettingModel(BaseModel):
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"""
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Initial global conditions for the system.
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{"parameter": "interest_rate", "value": .05}
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"""
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parameter: str
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value: float
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class InterventionModel(BaseModel):
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"""
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aka initial conditions
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>>> intervention.dict()
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{
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entity_settings: [
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{"name": "bud", "attribute": "pet_count", "value": 12},
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{"name": "pat", "attribute": "pet_count", "value": 0},
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],
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system_settings: None,
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}
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"""
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entity_settings: List[EntitySettingModel]
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system_settings: Optional[List[SystemSettingModel]] = None
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@validator("system_settings")
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def lower_case_name(cls, v: str) -> Union[str, None]:
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if v is not None:
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raise NotImplementedError("system_setting is not implemented yet")
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return v
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class QueryModel(BaseModel):
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"""translate a question about the story outcome into a programmatic expression"""
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question: str = Field(alias=Constant.narrative_input.value) # input
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expression: str # output, part of llm completion
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llm_error_msg: str # output, part of llm completion
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_result_table: str = PrivateAttr() # result of the executed query
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class ResultModel(BaseModel):
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question: str = Field(alias=Constant.narrative_input.value) # input
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_result_table: str = PrivateAttr() # result of the executed query
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class StoryModel(BaseModel):
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causal_operations: Any = Field(required=True)
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intervention: Any = Field(required=True)
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query: Any = Field(required=True)
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_outcome_table: Any = PrivateAttr(default=None)
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_networkx_wrapper: Any = PrivateAttr(default=None)
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def __init__(self, **kwargs: Any):
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super().__init__(**kwargs)
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self._compute()
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# TODO: when langchain adopts pydantic.v2 replace w/ `__post_init__`
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# misses hints github.com/pydantic/pydantic/issues/1729#issuecomment-1300576214
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# TODO: move away from `root_validator` since it is deprecated in pydantic v2
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# and causes mypy type-checking failures (hence the `type: ignore`)
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@root_validator # type: ignore[call-overload]
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def check_intervention_is_valid(cls, values: dict) -> dict:
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valid_names = [e.name for e in values["causal_operations"].entities]
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for setting in values["intervention"].entity_settings:
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if setting.name not in valid_names:
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error_msg = f"""
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Hypothetical question has an invalid entity name.
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`{setting.name}` not in `{valid_names}`
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"""
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raise ValueError(error_msg)
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return values
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def _block_back_door_paths(self) -> None:
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# stop intervention entities from depending on others
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intervention_entities = [
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entity_setting.name for entity_setting in self.intervention.entity_settings
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]
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for entity in self.causal_operations.entities:
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if entity.name in intervention_entities:
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entity.depends_on = []
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entity.code = "pass"
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def _set_initial_conditions(self) -> None:
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for entity_setting in self.intervention.entity_settings:
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for entity in self.causal_operations.entities:
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if entity.name == entity_setting.name:
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entity.value = entity_setting.value
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def _make_graph(self) -> None:
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self._networkx_wrapper = NetworkxEntityGraph()
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for entity in self.causal_operations.entities:
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for parent_name in entity.depends_on:
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self._networkx_wrapper._graph.add_edge(
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parent_name, entity.name, relation=entity.code
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)
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# TODO: is it correct to drop entities with no impact on the outcome (?)
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self.causal_operations.entities = [
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entity
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for entity in self.causal_operations.entities
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if entity.name in self._networkx_wrapper.get_topological_sort()
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]
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def _sort_entities(self) -> None:
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# order the sequence of causal actions
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sorted_nodes = self._networkx_wrapper.get_topological_sort()
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self.causal_operations.entities.sort(key=lambda x: sorted_nodes.index(x.name))
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def _forward_propagate(self) -> None:
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try:
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import pandas as pd
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except ImportError as e:
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raise ImportError(
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"Unable to import pandas, please install with `pip install pandas`."
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) from e
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entity_scope = {
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entity.name: entity for entity in self.causal_operations.entities
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}
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for entity in self.causal_operations.entities:
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if entity.code == "pass":
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continue
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else:
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# gist.github.com/dean0x7d/df5ce97e4a1a05be4d56d1378726ff92
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exec(entity.code, globals(), entity_scope)
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row_values = [entity.dict() for entity in entity_scope.values()]
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self._outcome_table = pd.DataFrame(row_values)
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def _run_query(self) -> None:
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def humanize_sql_error_msg(error: str) -> str:
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pattern = r"column\s+(.*?)\s+not found"
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col_match = re.search(pattern, error)
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if col_match:
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return (
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"SQL error: "
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+ col_match.group(1)
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+ " is not an attribute in your story!"
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)
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else:
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return str(error)
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if self.query.llm_error_msg == "":
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try:
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import duckdb
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df = self._outcome_table # noqa
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query_result = duckdb.sql(self.query.expression).df()
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self.query._result_table = query_result
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except duckdb.BinderException as e:
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self.query._result_table = humanize_sql_error_msg(str(e))
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except ImportError as e:
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raise ImportError(
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"Unable to import duckdb, please install with `pip install duckdb`."
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) from e
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except Exception as e:
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self.query._result_table = str(e)
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else:
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msg = "LLM maybe failed to translate question to SQL query."
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raise ValueError(
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{
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"question": self.query.question,
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"llm_error_msg": self.query.llm_error_msg,
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"msg": msg,
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}
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)
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def _compute(self) -> Any:
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self._block_back_door_paths()
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self._set_initial_conditions()
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self._make_graph()
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self._sort_entities()
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self._forward_propagate()
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self._run_query()
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def print_debug_report(self) -> None:
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report = {
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"outcome": self._outcome_table,
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"query": self.query.dict(),
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"result": self.query._result_table,
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}
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from pprint import pprint
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pprint(report)
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