[AUR-431, AUR-435] Add Agent Interface and ReWOO Agent implementation (#31)
* add base Tool * minor update test_tool * update test dependency * update test dependency * Fix namespace conflict * update test * add base Agent Interface, add ReWoo Agent * minor update * update test * fix typo * remove unneeded print * update rewoo agent --------- Co-authored-by: trducng <trungduc1992@gmail.com>
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Tuan Anh Nguyen Dang (Tadashi_Cin)
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knowledgehub/pipelines/agents/rewoo/agent.py
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270
knowledgehub/pipelines/agents/rewoo/agent.py
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import logging
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import re
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from concurrent.futures import ThreadPoolExecutor
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from typing import Any, Dict, List, Optional, Tuple, Type, Union
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from pydantic import BaseModel, create_model
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from kotaemon.llms.chats.base import ChatLLM
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from kotaemon.llms.completions.base import LLM
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from kotaemon.prompt.template import PromptTemplate
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from ..base import AgentOutput, AgentType, BaseAgent, BaseLLM, BaseTool
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from ..output.base import BaseScratchPad
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from ..utils import get_plugin_response_content
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from .planner import Planner
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from .solver import Solver
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class RewooAgent(BaseAgent):
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"""Distributive RewooAgent class inherited from BaseAgent.
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Implementing ReWOO paradigm https://arxiv.org/pdf/2305.18323.pdf"""
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name: str = "RewooAgent"
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type: AgentType = AgentType.rewoo
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description: str = "RewooAgent for answering multi-step reasoning questions"
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llm: Union[BaseLLM, Dict[str, BaseLLM]] # {"Planner": xxx, "Solver": xxx}
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prompt_template: Dict[
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str, PromptTemplate
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] = dict() # {"Planner": xxx, "Solver": xxx}
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plugins: List[BaseTool] = list()
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examples: Dict[str, Union[str, List[str]]] = dict()
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args_schema: Optional[Type[BaseModel]] = create_model(
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"ReactArgsSchema", instruction=(str, ...)
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)
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def _get_llms(self):
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if isinstance(self.llm, ChatLLM) or isinstance(self.llm, LLM):
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return {"Planner": self.llm, "Solver": self.llm}
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elif (
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isinstance(self.llm, dict)
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and "Planner" in self.llm
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and "Solver" in self.llm
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):
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return {"Planner": self.llm["Planner"], "Solver": self.llm["Solver"]}
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else:
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raise ValueError("llm must be a BaseLLM or a dict with Planner and Solver.")
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def _parse_plan_map(
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self, planner_response: str
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) -> Tuple[Dict[str, List[str]], Dict[str, str]]:
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"""
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Parse planner output. It should be an n-to-n mapping from Plans to #Es.
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This is because sometimes LLM cannot follow the strict output format.
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Example:
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#Plan1
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#E1
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#E2
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should result in: {"#Plan1": ["#E1", "#E2"]}
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Or:
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#Plan1
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#Plan2
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#E1
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should result in: {"#Plan1": [], "#Plan2": ["#E1"]}
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This function should also return a plan map.
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Returns:
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Tuple[Dict[str, List[str]], Dict[str, str]]: A list of plan map
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"""
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valid_chunk = [
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line
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for line in planner_response.splitlines()
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if line.startswith("#Plan") or line.startswith("#E")
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]
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plan_to_es: Dict[str, List[str]] = dict()
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plans: Dict[str, str] = dict()
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for line in valid_chunk:
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if line.startswith("#Plan"):
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plan = line.split(":", 1)[0].strip()
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plans[plan] = line.split(":", 1)[1].strip()
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plan_to_es[plan] = []
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elif line.startswith("#E"):
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plan_to_es[plan].append(line.split(":", 1)[0].strip())
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return plan_to_es, plans
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def _parse_planner_evidences(
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self, planner_response: str
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) -> Tuple[Dict[str, str], List[List[str]]]:
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"""
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Parse planner output. This should return a mapping from #E to tool call.
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It should also identify the level of each #E in dependency map.
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Example:
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{
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"#E1": "Tool1", "#E2": "Tool2",
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"#E3": "Tool3", "#E4": "Tool4"
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}, [[#E1, #E2], [#E3, #E4]]
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Returns:
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Tuple[dict[str, str], List[List[str]]]:
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A mapping from #E to tool call and a list of levels.
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"""
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evidences: Dict[str, str] = dict()
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dependence: Dict[str, List[str]] = dict()
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for line in planner_response.splitlines():
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if line.startswith("#E") and line[2].isdigit():
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e, tool_call = line.split(":", 1)
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e, tool_call = e.strip(), tool_call.strip()
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if len(e) == 3:
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dependence[e] = []
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evidences[e] = tool_call
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for var in re.findall(r"#E\d+", tool_call):
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if var in evidences:
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dependence[e].append(var)
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else:
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evidences[e] = "No evidence found"
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level = []
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while dependence:
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select = [i for i in dependence if not dependence[i]]
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if len(select) == 0:
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raise ValueError("Circular dependency detected.")
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level.append(select)
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for item in select:
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dependence.pop(item)
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for item in dependence:
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for i in select:
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if i in dependence[item]:
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dependence[item].remove(i)
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return evidences, level
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def _run_plugin(
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self,
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e: str,
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planner_evidences: Dict[str, str],
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worker_evidences: Dict[str, str],
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output=BaseScratchPad(),
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):
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"""
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Run a plugin for a given evidence.
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This function should also cumulate the cost and tokens.
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"""
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result = dict(e=e, plugin_cost=0, plugin_token=0, evidence="")
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tool_call = planner_evidences[e]
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if "[" not in tool_call:
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result["evidence"] = tool_call
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else:
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tool, tool_input = tool_call.split("[", 1)
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tool_input = tool_input[:-1]
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# find variables in input and replace with previous evidences
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for var in re.findall(r"#E\d+", tool_input):
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if var in worker_evidences:
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tool_input = tool_input.replace(var, worker_evidences.get(var, ""))
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try:
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selected_plugin = self._find_plugin(tool)
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if selected_plugin is None:
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raise ValueError("Invalid plugin detected")
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tool_response = selected_plugin(tool_input)
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# cumulate agent-as-plugin costs and tokens.
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if isinstance(tool_response, AgentOutput):
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result["plugin_cost"] = tool_response.cost
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result["plugin_token"] = tool_response.token_usage
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result["evidence"] = get_plugin_response_content(tool_response)
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except ValueError:
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result["evidence"] = "No evidence found."
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finally:
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output.panel_print(
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result["evidence"], f"[green] Function Response of [blue]{tool}: "
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)
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return result
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def _get_worker_evidence(
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self,
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planner_evidences: Dict[str, str],
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evidences_level: List[List[str]],
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output=BaseScratchPad(),
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) -> Any:
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"""
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Parallel execution of plugins in DAG for speedup.
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This is one of core benefits of ReWOO agents.
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Args:
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planner_evidences: A mapping from #E to tool call.
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evidences_level: A list of levels of evidences.
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Calculated from DAG of plugin calls.
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output: Output object, defaults to BaseOutput().
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Returns:
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A mapping from #E to tool call.
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"""
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worker_evidences: Dict[str, str] = dict()
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plugin_cost, plugin_token = 0.0, 0.0
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with ThreadPoolExecutor() as pool:
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for level in evidences_level:
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results = []
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for e in level:
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results.append(
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pool.submit(
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self._run_plugin,
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e,
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planner_evidences,
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worker_evidences,
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output,
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)
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)
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if len(results) > 1:
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output.update_status(f"Running tasks {level} in parallel.")
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else:
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output.update_status(f"Running task {level[0]}.")
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for r in results:
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resp = r.result()
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plugin_cost += resp["plugin_cost"]
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plugin_token += resp["plugin_token"]
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worker_evidences[resp["e"]] = resp["evidence"]
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output.done()
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return worker_evidences, plugin_cost, plugin_token
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def _find_plugin(self, name: str):
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for p in self.plugins:
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if p.name == name:
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return p
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def _run_tool(self, instruction: str) -> AgentOutput:
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"""
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Run the agent with a given instruction.
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"""
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logging.info(f"Running {self.name} with instruction: {instruction}")
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total_cost = 0.0
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total_token = 0
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planner_llm = self._get_llms()["Planner"]
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solver_llm = self._get_llms()["Solver"]
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planner = Planner(
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model=planner_llm,
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plugins=self.plugins,
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prompt_template=self.prompt_template.get("Planner", None),
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examples=self.examples.get("Planner", None),
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)
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solver = Solver(
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model=solver_llm,
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prompt_template=self.prompt_template.get("Solver", None),
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examples=self.examples.get("Solver", None),
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)
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# Plan
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planner_output = planner(instruction)
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plannner_text_output = planner_output.text[0]
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plan_to_es, plans = self._parse_plan_map(plannner_text_output)
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planner_evidences, evidence_level = self._parse_planner_evidences(
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plannner_text_output
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)
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# Work
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worker_evidences, plugin_cost, plugin_token = self._get_worker_evidence(
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planner_evidences, evidence_level
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)
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worker_log = ""
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for plan in plan_to_es:
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worker_log += f"{plan}: {plans[plan]}\n"
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for e in plan_to_es[plan]:
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worker_log += f"{e}: {worker_evidences[e]}\n"
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# Solve
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solver_output = solver(instruction, worker_log)
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solver_output_text = solver_output.text[0]
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return AgentOutput(
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output=solver_output_text, cost=total_cost, token_usage=total_token
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)
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