270 lines
10 KiB
Python
270 lines
10 KiB
Python
#!/usr/bin/env python3
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# -*- coding: UTF-8 -*-
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###########################################################################
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# Copyright © 1998 - 2026 Tencent. All Rights Reserved.
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###########################################################################
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"""
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Author: Tencent AI Arena Authors
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Robot Vacuum Agent.
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清扫大作战 Agent 主类。
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"""
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import torch
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torch.set_num_threads(1)
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torch.set_num_interop_threads(1)
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import numpy as np
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from agent_ppo.algorithm.algorithm import Algorithm
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from agent_ppo.conf.conf import Config
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from agent_ppo.feature.definition import ActData, ObsData
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from agent_ppo.feature.preprocessor import Preprocessor
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from agent_ppo.model.model import Model
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from kaiwudrl.interface.agent import BaseAgent
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class Agent(BaseAgent):
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def __init__(self, agent_type="player", device=None, logger=None, monitor=None):
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torch.manual_seed(0)
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self.device = device
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self.model = Model(device).to(self.device)
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self.optimizer = torch.optim.Adam(
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params=self.model.parameters(),
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lr=Config.INIT_LEARNING_RATE_START,
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betas=(0.9, 0.999),
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eps=1e-8,
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)
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self.logger = logger
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self.monitor = monitor
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self.algorithm = Algorithm(self.model, self.optimizer, self.device, self.logger, self.monitor)
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self.preprocessor = Preprocessor()
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self.last_action = -1
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self.last_reward = 0.0
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super().__init__(agent_type, device, logger, monitor)
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def reset(self, env_obs):
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"""Reset per-episode state.
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每局开始时重置 Agent 内部状态。
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"""
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self.preprocessor = Preprocessor()
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self.last_action = -1
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self.last_reward = 0.0
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def observation_process(self, env_obs):
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"""Convert raw env_obs to ObsData (feature + legal action mask).
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将原始 env_obs 转换为 ObsData（特征 + 合法动作掩码）。
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"""
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feature, legal_action, reward = self.preprocessor.feature_process(env_obs, self.last_action)
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self.last_reward = reward
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obs_data = ObsData(
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feature=list(feature),
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legal_action=legal_action,
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)
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remain_info = {}
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return obs_data, remain_info
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def action_process(self, act_data, is_stochastic=True):
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"""Extract int action from ActData and update last_action.
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从 ActData 中取出动作整数并更新 last_action。
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"""
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action = act_data.action if is_stochastic else act_data.d_action
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self.last_action = int(action[0])
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if hasattr(self.preprocessor, "record_action"):
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self.preprocessor.record_action(self.last_action)
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return self.last_action
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def predict(self, list_obs_data):
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"""Stochastic inference for training (exploration).
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训练时推理（随机采样动作）。
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"""
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obs_data = list_obs_data[0]
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feature = obs_data.feature
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legal_action = obs_data.legal_action
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logits, value = self._run_model(feature)
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legal_arr = np.array(legal_action, dtype=np.float32)
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prob = self._legal_soft_max(logits, legal_arr)
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action = self._legal_sample(prob, use_max=False)
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d_action = self._legal_sample(prob, use_max=True)
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return [
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ActData(
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action=[action],
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d_action=[d_action],
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prob=list(prob),
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value=value,
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)
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]
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def exploit(self, env_obs):
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"""Greedy inference for evaluation.
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评估时推理（贪心）。
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"""
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try:
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obs_data, _ = self.observation_process(env_obs)
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logits, value = self._run_model(obs_data.feature)
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legal_arr = np.array(obs_data.legal_action, dtype=np.float32)
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prob = self._legal_soft_max(logits, legal_arr)
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action = None
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if hasattr(self.preprocessor, "planned_eval_action"):
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action = self.preprocessor.planned_eval_action(prob, legal_arr)
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if action is None:
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action = self._tie_break_eval_action(prob, legal_arr)
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act_data = ActData(
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action=[action],
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d_action=[action],
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prob=list(prob),
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value=value,
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)
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return self.action_process(act_data, is_stochastic=False)
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except Exception as err:
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if self.logger:
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if hasattr(self.logger, "exception"):
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self.logger.exception(f"exploit fallback action due to inference error: {err}")
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else:
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self.logger.error(f"exploit fallback action due to inference error: {err}")
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return self._fallback_action(env_obs)
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def learn(self, list_sample_data):
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"""Delegate to Algorithm for PPO update.
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委托给 Algorithm 执行训练。
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"""
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return self.algorithm.learn(list_sample_data)
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def estimate_value(self, obs_data):
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"""Estimate critic value for a processed observation."""
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_, value = self._run_model(obs_data.feature)
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return np.asarray(value, dtype=np.float32).reshape(-1)[: Config.VALUE_NUM]
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def save_model(self, path=None, id="1"):
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"""Save model checkpoint.
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保存模型检查点。
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"""
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model_file_path = f"{path}/model.ckpt-{id}.pkl"
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state_dict_cpu = {k: v.clone().cpu() for k, v in self.model.state_dict().items()}
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torch.save(state_dict_cpu, model_file_path)
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self.logger.info(f"save model {model_file_path} successfully")
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def load_model(self, path=None, id="1"):
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"""Load model checkpoint.
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加载模型检查点。
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"""
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model_file_path = f"{path}/model.ckpt-{id}.pkl"
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state_dict = torch.load(model_file_path, map_location=self.device)
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try:
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self.model.load_state_dict(state_dict)
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except RuntimeError as err:
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msg = f"skip incompatible model {model_file_path}, use current initialized model instead: {err}"
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if self.logger:
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self.logger.warning(msg)
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return
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if self.logger:
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self.logger.info(f"load model {model_file_path} successfully")
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def _fallback_action(self, env_obs):
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"""Return a valid action instead of None during evaluation failures."""
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legal_action = [1] * Config.ACTION_NUM
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if isinstance(env_obs, dict):
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observation = env_obs.get("observation")
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if isinstance(observation, dict):
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raw_legal = observation.get("legal_action") or observation.get("legal_act")
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if isinstance(raw_legal, (list, tuple)) and raw_legal:
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legal_action = [int(x) for x in raw_legal[: Config.ACTION_NUM]]
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if len(legal_action) < Config.ACTION_NUM:
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legal_action.extend([0] * (Config.ACTION_NUM - len(legal_action)))
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for action, is_legal in enumerate(legal_action):
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if is_legal > 0:
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self.last_action = action
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return action
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self.last_action = 0
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return 0
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def _run_model(self, feature):
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"""Gradient-free forward pass, returns (logits_np, value_np).
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无梯度推理，返回 (logits_np, value_np)。
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"""
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self.model.set_eval_mode()
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obs_tensor = (
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torch.tensor(np.array([feature], dtype=np.float32)).view(1, Config.DIM_OF_OBSERVATION).to(self.device)
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)
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with torch.no_grad():
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rst = self.model(obs_tensor, inference=True)
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logits = rst[0].cpu().numpy()[0]
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value = rst[1].cpu().numpy()[0]
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return logits, value
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def _legal_soft_max(self, logits, legal_action):
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"""Softmax with legal action masking.
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合法动作掩码下的 softmax。
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"""
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legal = np.asarray(legal_action, dtype=np.float32) > 0.5
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if not np.any(legal):
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legal = np.ones(Config.ACTION_NUM, dtype=bool)
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masked_logits = np.asarray(logits, dtype=np.float32).copy()
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masked_logits[~legal] = -1e9
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shifted = masked_logits - np.max(masked_logits)
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probs = np.exp(shifted) * legal.astype(np.float32)
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prob_sum = float(np.sum(probs))
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if prob_sum <= 0.0 or not np.isfinite(prob_sum):
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probs = legal.astype(np.float32)
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prob_sum = float(np.sum(probs))
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return probs / prob_sum
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def _legal_sample(self, probs, use_max=False):
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"""Sample action from probability distribution (argmax if use_max=True).
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按概率分布采样动作（use_max=True 时取 argmax）。
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"""
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probs = np.asarray(probs, dtype=np.float64)
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prob_sum = float(np.sum(probs))
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if prob_sum <= 0.0 or not np.isfinite(prob_sum):
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probs = np.ones(Config.ACTION_NUM, dtype=np.float64) / Config.ACTION_NUM
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else:
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probs = probs / prob_sum
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if use_max:
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return int(np.argmax(probs))
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return int(np.random.choice(len(probs), p=probs))
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def _tie_break_eval_action(self, probs, legal_action):
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"""Use a light heuristic only when evaluation probabilities are close."""
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probs = np.asarray(probs, dtype=np.float64)
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legal = np.asarray(legal_action, dtype=np.float32) > 0.5
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if not np.any(legal):
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legal = np.ones(Config.ACTION_NUM, dtype=bool)
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legal_indices = np.flatnonzero(legal)
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best_action = int(legal_indices[np.argmax(probs[legal_indices])])
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best_prob = float(probs[best_action])
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candidates = [
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int(action)
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for action in legal_indices
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if best_prob - float(probs[int(action)]) <= Config.EVAL_TIE_BREAK_PROB_GAP
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]
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if len(candidates) <= 1:
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return best_action
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scored = []
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for action in candidates:
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heuristic = 0.0
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if hasattr(self.preprocessor, "evaluation_action_score"):
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heuristic = self.preprocessor.evaluation_action_score(action)
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combined = float(probs[action]) + Config.EVAL_TIE_BREAK_SCORE_SCALE * heuristic
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scored.append((combined, float(probs[action]), -action, action))
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scored.sort(reverse=True)
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return int(scored[0][3])
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