""" title: mcts author: av author_url: https://github.com/av description: mcts - Monte Carlo Tree Search version: 0.0.5.3JAN25.adamoutler Prominant Notice of Change: Modified by Adam Outler to fix crashing issue when user data is supplied. Fix based on patch supplied by nschulzke. https://github.com/open-webui/open-webui/discussions/6487 Added a fix for setting model using Valves -zzxc Prominant Notice of Change: Modified by Adam Outler Based on zzxc version to fix crashing on 5.x when any request is made without the new __request__ variable. """ import logging import random import math import asyncio import json import re from typing import ( List, Optional, AsyncGenerator, Callable, Awaitable, Generator, Iterator, ) from open_webui.constants import TASKS from open_webui.routers import ollama import traceback from pydantic import BaseModel, Field from dataclasses import dataclass from fastapi import Request # ============================================================================== name = "mcts" default_max_children = 2 default_exploration_weight = 1.414 default_max_iterations = 2 default_max_simulations = 2 default_thoughts = 2 @dataclass class User: id: str email: str name: str role: str # ============================================================================== thoughts_prompt = """ <instruction> Give a suggestion on how this answer can be improved. WRITE ONLY AN IMPROVEMENT SUGGESTION AND NOTHING ELSE. YOUR REPLY SHOULD BE A SINGLE SENTENCE. </instruction> <question> {question} </question> <draft> {answer} </draft> """.strip() eval_answer_prompt = """ Given the following text: "{answer}" How well does it answers this question: "{question}" Rate the answer from 1 to 10, where 1 is completely wrong or irrelevant and 10 is a perfect answer. Reply with a single number between 1 and 10 only. Do not write anything else, it will be discarded. THINK CAREFULLY AND USE BEST PRACTICES. """.strip() analyze_prompt = """ Iteration Analysis: Original question: {question} Best answer found: {best_answer} Best score achieved: {best_score} Analyze this iteration of the thought process. Consider the following: 1. What aspects of the best answer made it successful? 2. What patterns or approaches led to higher-scoring thoughts? 3. Were there any common pitfalls or irrelevant tangents in lower-scoring thoughts? 4. How can the thought generation process be improved for the next iteration? Provide a concise analysis and suggest one specific improvement strategy for the next iteration. """.strip() update_prompt = """ <instruction> Your task is to read the question and the answer below, then analyse the given critique. When you are done - think about how the answer can be improved based on the critique. WRITE A REVISED ANSWER THAT ADDRESSES THE CRITIQUE. DO NOT WRITE ANYTHING ELSE. </instruction> <question> {question} </question> <draft> {answer} </draft> <critique> {improvements} </critique> """.strip() initial_prompt = """ <instruction> Answer the question below. Do not pay attention to, unexpected casing, punctuation or accent marks. </instruction> <question> {question} </question> """ # ============================================================================== def setup_logger(): logger = logging.getLogger(__name__) if not logger.handlers: logger.setLevel(logging.DEBUG) handler = logging.StreamHandler() handler.set_name(name) formatter = logging.Formatter( "%(asctime)s - %(name)s - %(levelname)s - %(message)s" ) handler.setFormatter(formatter) logger.addHandler(handler) logger.propagate = False return logger logger = setup_logger() # ============================================================================== mods = [ "capitalize", "diacritic", "leetspeak", "remove_vowel", ] def modify_text(text, percentage): if not text: return "", {} # Return empty string and empty mapping if input is empty if not 0 <= percentage <= 100: raise ValueError("Percentage must be between 0 and 100") words = text.split() chars = list(text) num_chars_to_modify = max(1, int(len(chars) * (percentage / 100))) indices_to_modify = random.sample(range(len(chars)), num_chars_to_modify) word_mapping = {} for idx in indices_to_modify: modification = random.choice(mods) # Find the word that contains the current character current_length = 0 for word_idx, word in enumerate(words): if current_length <= idx < current_length + len(word): original_word = word word_start_idx = current_length break current_length += len(word) + 1 # +1 for the space else: # If we're here, we're likely dealing with a space or the last character continue if modification == "capitalize": chars[idx] = chars[idx].swapcase() elif modification == "diacritic": if chars[idx].isalpha(): diacritics = ["̀", "́", "̂", "̃", "̈", "̄", "̆", "̇", "̊", "̋"] chars[idx] = chars[idx] + random.choice(diacritics) elif modification == "leetspeak": leetspeak_map = { "a": "4", "e": "3", "i": "1", "o": "0", "s": "5", "t": "7", "b": "8", "g": "9", "l": "1", } chars[idx] = leetspeak_map.get(chars[idx].lower(), chars[idx]) elif modification == "remove_vowel": if chars[idx].lower() in "aeiou": chars[idx] = "" modified_word = "".join( chars[word_start_idx : word_start_idx + len(original_word)] ) if modified_word != original_word: # Clean up both the modified word and the original word cleaned_modified_word = modified_word.rstrip(".,!?") cleaned_original_word = original_word.rstrip(".,!?") word_mapping[cleaned_modified_word] = cleaned_original_word modified_text = "".join(chars) return modified_text, word_mapping def replace_with_mapping(text, mapping): for key, value in mapping.items(): text = text.replace(key, value) return text # ============================================================================== def escape_mermaid(text): return text.replace('"', "&quot;").replace("(", "&#40;").replace(")", "&#41;") class Node: id: str content: str parent: Optional["Node"] max_children: int children: List["Node"] visits: int value: float def __init__(self, **kwargs): self.id = "".join(random.choices("abcdefghijklmnopqrstuvwxyz", k=4)) self.content = kwargs.get("content") self.parent = kwargs.get("parent") self.exploration_weight = kwargs.get( "exploration_weight", default_exploration_weight ) self.max_children = kwargs.get("max_children", default_max_children) self.children = [] self.visits = 0 self.value = 0 def add_child(self, child: "Node"): child.parent = self self.children.append(child) return child def fully_expanded(self): return len(self.children) >= self.max_children def uct_value(self): epsilon = 1e-6 return self.value / ( self.visits + epsilon ) + self.exploration_weight * math.sqrt( math.log(self.parent.visits) / (self.visits + epsilon) ) def mermaid(self, offset=0, selected=None): padding = " " * offset msg = f"{padding}{self.id}({self.id}:{self.visits} - {escape_mermaid(self.content[:25])})\n" if selected == self.id: msg += f"{padding}style {self.id} stroke:#0ff\n" for child in self.children: msg += child.mermaid(offset + 4, selected) msg += f"{padding}{self.id} --> {child.id}\n" return msg def best_child(self): if not self.children: return self return max(self.children, key=lambda child: child.visits).best_child() class MCTS: question: str root: Node llm: "Pipe" selected: Optional[Node] exploration_weight: float def __init__(self, **kwargs): self.question = kwargs.get("question") self.root = kwargs.get("root") self.llm = kwargs.get("llm") self.selected = None self.exploration_weight = kwargs.get( "exploration_weight", default_exploration_weight ) async def select(self): logger.debug("Selecting node...") node = self.root while node.children: node = self.uct_select(node) return node async def expand(self, __request__: Request, node): logger.debug(f"Expanding node {node.id}...") await self.llm.progress(f"Thinking about {node.id}...") for _ in range(random.randint(default_thoughts, default_thoughts + 1)): await self.llm.emit_replace(self.mermaid(node)) await self.llm.emit_message(f"Thought: ") thought = await self.llm.generate_thought(__request__, node.content) await self.llm.emit_message(f"\n\n---\n\nSolution:\n") new_content = await self.llm.update_approach( __request__, node.content, thought ) child = Node(content=new_content, parent=node) node.add_child(child) return random.choice(node.children) async def simulate(self, __request__: Request, node): logger.debug(f"Simulating node {node.id}...") await self.llm.progress(f"Thinking about {node.id}...") await self.llm.emit_replace(self.mermaid()) return await self.llm.evaluate_answer(__request__, node.content) def backpropagate(self, node, score): logger.debug(f"Backpropagating from {node.id}...") while node: node.visits += 1 node.value += score node = node.parent def uct_select(self, node): logger.debug(f"Selecting uct {node.id}...") return max(node.children, key=lambda child: child.uct_value()) def best_child(self): return self.root.best_child() async def search(self, __request__: Request, num_simulations): logger.debug("Starting search...") for _ in range(num_simulations): leaf = await self.select() self.selected = leaf if not leaf.fully_expanded(): leaf = await self.expand(__request__, leaf) score = await self.simulate(__request__, leaf) self.backpropagate(leaf, score) return self.selected def mermaid(self, selected=None): return f""" ```mermaid graph LR {self.root.mermaid(0, selected.id if selected else self.selected.id)} ``` """ # ============================================================================== EventEmitter = Callable[[dict], Awaitable[None]] class Pipe: __current_event_emitter__: EventEmitter __current_node__: Node __question__: str __model__: str class Valves(BaseModel): MODEL: str = Field( default="llama3.2:latest", description="Model to use (model id from ollama)" ) def __init__(self): self.valves = self.Valves() def pipes(self) -> list[dict[str, str]]: out = [ {"id": f"{name}-{self.valves.MODEL}", "name": f"{name} {self.valves.MODEL}"} ] logger.debug(f"Available models: {out}") return out def resolve_model(self, body: dict) -> str: model_id = body.get("model") without_pipe = ".".join(model_id.split(".")[1:]) return without_pipe.replace(f"{name}-", "") def resolve_question(self, body: dict) -> str: return body.get("messages")[-1].get("content").strip() async def pipe( self, body: dict, __user__: dict, __request__: Request, __event_emitter__=None, __task__=None, __model__=None, ) -> str | Generator | Iterator: model = self.resolve_model(body) base_question = self.resolve_question(body) if __task__: content = await self.get_completion( __request__, model, body.get("messages") ) return f"{name}: {content}" logger.debug(f"Pipe {name} received: {body}") question, mapping = modify_text(base_question, 0) logger.debug(f"Question: {question}") # TODO: concurrency self.__model__ = model self.__question__ = base_question self.__current_event_emitter__ = __event_emitter__ logger.debug(f"User: {__user__}") self.__user__ = User(**__user__) best_answer = None best_score = -float("inf") await self.progress("Preparing initial thoughts...") initial_reply = await self.stream_prompt_completion( __request__, initial_prompt, question=question ) root = Node(content=initial_reply) mcts = MCTS(root=root, llm=self) logger.debug("Starting MCTS...") for i in range(default_max_iterations): logger.debug(f"Iteration {i + 1}/{default_max_iterations}...") await mcts.search(__request__, default_max_simulations) logger.debug(mcts.mermaid()) best_child = mcts.best_child() score = await self.evaluate_answer(__request__, best_child.content) if score > best_score: best_score = score best_answer = best_child.content await self.emit_replace(mcts.mermaid(best_child)) await self.emit_message(f"{best_answer}") await asyncio.sleep(0.2) await self.done() return "" async def progress( self, message: str, ): logger.debug(f"Progress: {message}") await self.emit_status("info", message, False) async def done( self, ): await self.emit_status("info", "Fin.", True) async def emit_message(self, message: str): await self.__current_event_emitter__( {"type": "message", "data": {"content": message}} ) async def emit_replace(self, message: str): await self.__current_event_emitter__( {"type": "replace", "data": {"content": message}} ) async def emit_status(self, level: str, message: str, done: bool): await self.__current_event_emitter__( { "type": "status", "data": { "status": "complete" if done else "in_progress", "level": level, "description": message, "done": done, }, } ) async def get_streaming_completion( self, __request__: Request, model: str, messages, ) -> AsyncGenerator[str, None]: response = await ollama.generate_openai_chat_completion( __request__, {"model": model, "messages": messages, "stream": True}, user=self.__user__, ) async for chunk in response.body_iterator: for part in self.get_chunk_content(chunk): yield part async def get_message_completion(self, __request__: Request, model: str, content): async for chunk in self.get_streaming_completion( __request__, model, [{"role": "user", "content": content}] ): yield chunk async def get_completion(self, _request__: Request, model: str, messages): response = await ollama.generate_openai_chat_completion( __request__, {"model": model, "messages": messages, "stream": False}, user=self.__user__, ) return self.get_response_content(response) async def stream_prompt_completion( self, __request__: Request, prompt, **format_args ): complete = "" async for chunk in self.get_message_completion( __request__, self.__model__, prompt.format(**format_args), ): complete += chunk await self.emit_message(chunk) return complete async def generate_thought(self, __request__: Request, answer): return await self.stream_prompt_completion( __request__, thoughts_prompt, answer=answer, question=self.__question__ ) # async def analyze_iteration(self,__request__:Request best_answer, best_score): # return await self.stream_prompt_completion(__request__, # analyze_prompt, # question=self.__question__, # best_answer=best_answer, # best_score=best_score, # ) async def update_approach(self, __request__: Request, answer, improvements): return await self.stream_prompt_completion( __request__, update_prompt, question=self.__question__, answer=answer, improvements=improvements, ) async def evaluate_answer(self, __request__: Request, answer): result = await self.stream_prompt_completion( __request__, eval_answer_prompt, answer=answer, question=self.__question__, ) try: score = re.search(r"\d+", result).group() return int(score) except AttributeError: logger.error(f'AnswerEval: unable to parse "{result[:100]}"') return 0 def get_response_content(self, response): try: return response["choices"][0]["message"]["content"] except (KeyError, IndexError): logger.error( f'ResponseError: unable to extract content from "{response[:100]}"' ) return "" def get_chunk_content(self, chunk): chunk_str = chunk.decode("utf-8") if chunk_str.startswith("data: "): chunk_str = chunk_str[6:] chunk_str = chunk_str.strip() if chunk_str == "[DONE]" or not chunk_str: return try: chunk_data = json.loads(chunk_str) if "choices" in chunk_data and len(chunk_data["choices"]) > 0: delta = chunk_data["choices"][0].get("delta", {}) if "content" in delta: yield delta["content"] except json.JSONDecodeError: logger.error(f'ChunkDecodeError: unable to parse "{chunk_str[:100]}"')