364 lines
16 KiB
Python
364 lines
16 KiB
Python
import gymnasium as gym
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from gymnasium import spaces
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import numpy as np
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import yaml
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import math
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class PartitionMazeEnv(gym.Env):
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"""
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自定义环境，分为两阶段：
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阶段 0：区域切分（共 4 步，每一步输出一个标量，用于确定竖切和横切位置）。
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切分顺序为：第一步输出 c₁，第二步输出 c₂，第三步输出 r₁，第四步输出 r₂。
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离散化后取值仅为 {0, 0.1, 0.2, …, 0.9}（其中 0 表示不切）。
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阶段 1：车辆路径规划（走迷宫），车辆从区域中心出发，在九宫格内按照上下左右移动，
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直到所有目标格子被覆盖或步数上限达到。
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"""
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def __init__(self, config=None):
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super(PartitionMazeEnv, self).__init__()
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# 车队参数设置
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with open('params.yml', 'r', encoding='utf-8') as file:
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params = yaml.safe_load(file)
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self.H = params['H']
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self.W = params['W']
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self.num_cars = params['num_cars']
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self.flight_time_factor = params['flight_time_factor']
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self.comp_time_factor = params['comp_time_factor']
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self.trans_time_factor = params['trans_time_factor']
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self.car_time_factor = params['car_time_factor']
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self.bs_time_factor = params['bs_time_factor']
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self.flight_energy_factor = params['flight_energy_factor']
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self.comp_energy_factor = params['comp_energy_factor']
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self.trans_energy_factor = params['trans_energy_factor']
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self.battery_energy_capacity = params['battery_energy_capacity']
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##############################
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# 可能需要手动修改的超参数
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##############################
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self.CUT_NUM = 4 # 横切一半，竖切一半
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self.BASE_LINE = 3500 # 基准时间，通过greedy或者蒙特卡洛计算出来
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self.MAX_STEPS = 10 # 迷宫走法步数上限
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self.phase = 0 # 阶段控制，0：区域划分阶段，1：迷宫初始化阶段，2：走迷宫阶段
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self.partition_step = 0 # 区域划分阶段步数，范围 0~4
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self.partition_values = np.zeros(
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self.CUT_NUM, dtype=np.float32) # 存储 c₁, c₂, r₁, r₂
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# 定义动作空间：全部动作均为 1 维连续 [0,1]
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self.action_space = spaces.Box(
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low=0.0, high=1.0, shape=(1,), dtype=np.float32)
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# 定义观察空间为8维向量
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# 阶段 0 状态：前 4 维表示已决策的切分值（未决策部分为 0）
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# 阶段 1 状态：区域访问状态向量（长度为(CUT_NUM/2+1)^2）
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max_regions = (self.CUT_NUM // 2 + 1) ** 2
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self.observation_space = spaces.Box(
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low=0.0, high=100.0, shape=(self.CUT_NUM + max_regions + 1,), dtype=np.float32)
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# 切分阶段相关变量
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self.col_cuts = [] # 存储竖切位置（c₁, c₂），当值为0时表示不切
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self.row_cuts = [] # 存储横切位置（r₁, r₂）
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self.init_maze_step = 0
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# 路径规划阶段相关变量
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self.step_count = 0
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self.rectangles = {}
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self.car_pos = [(self.H / 2, self.W / 2) for _ in range(self.num_cars)]
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self.car_traj = [[] for _ in range(self.num_cars)]
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self.current_car_index = 0
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self.delay_time = 0
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def reset(self, seed=None, options=None):
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# 重置所有变量，回到切分阶段（phase 0）
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self.phase = 0
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self.partition_step = 0
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self.partition_values = np.zeros(self.CUT_NUM, dtype=np.float32)
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self.col_cuts = []
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self.row_cuts = []
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self.init_maze_step = 0
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self.region_centers = []
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self.step_count = 0
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self.rectangles = {}
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self.car_pos = [(self.H / 2, self.W / 2) for _ in range(self.num_cars)]
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self.car_traj = [[] for _ in range(self.num_cars)]
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self.current_car_index = 0
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self.delay_time = 0
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# 状态：前 4 维为 partition_values，其余为区域访问状态（初始全0）
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max_regions = (self.CUT_NUM // 2 + 1) ** 2
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state = np.concatenate([
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self.partition_values,
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np.zeros(max_regions, dtype=np.float32),
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[0.0]
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])
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return state
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def step(self, action):
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# 在所有阶段动作均为 1 维连续动作，取 action[0]
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a = float(action[0])
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if self.phase == 0:
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# 切分阶段：每一步输出一个标量，离散化为 {0, 0.1, ..., 0.9}
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disc_val = np.floor(a * 10) / 10.0
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disc_val = np.clip(disc_val, 0.0, 0.9)
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self.partition_values[self.partition_step] = disc_val
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self.partition_step += 1
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# 构造当前状态：前 partition_step 个为已决策值，其余为 0，再补 7 个 0
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state = np.concatenate([
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self.partition_values,
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np.zeros((self.CUT_NUM // 2 + 1) ** 2, dtype=np.float32),
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[0.0]
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])
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# 如果未完成 4 步，则仍处于切分阶段，不发奖励，done 为 False
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if self.partition_step < self.CUT_NUM:
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return state, 0.0, False, False, {}
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else:
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# 完成 4 步后，计算切分边界
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# 过滤掉 0，并去重后排序
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vert = sorted(set(v for v in self.partition_values[:len(
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self.partition_values) // 2] if v > 0))
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horiz = sorted(set(v for v in self.partition_values[len(
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self.partition_values) // 2:] if v > 0))
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vertical_cuts = vert if vert else []
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horizontal_cuts = horiz if horiz else []
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# 边界：始终包含 0 和 1
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self.col_cuts = [0.0] + vertical_cuts + [1.0]
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self.row_cuts = [0.0] + horizontal_cuts + [1.0]
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# 判断分区是否合理，并计算各个分区的任务卸载率ρ
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valid_partition = True
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for i in range(len(self.row_cuts) - 1):
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for j in range(len(self.col_cuts) - 1):
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d = (self.col_cuts[j+1] - self.col_cuts[j]) * self.W * \
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(self.row_cuts[i+1] - self.row_cuts[i]) * self.H
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rho_time_limit = (self.flight_time_factor - self.trans_time_factor) / \
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(self.comp_time_factor - self.trans_time_factor)
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rho_energy_limit = (self.battery_energy_capacity - self.flight_energy_factor * d - self.trans_energy_factor * d) / \
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(self.comp_energy_factor * d -
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self.trans_energy_factor * d)
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if rho_energy_limit < 0:
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valid_partition = False
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break
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rho = min(rho_time_limit, rho_energy_limit)
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flight_time = self.flight_time_factor * d
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bs_time = self.bs_time_factor * (1 - rho) * d
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self.rectangles[(i, j)] = {
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'center': ((self.row_cuts[i] + self.row_cuts[i+1]) * self.H / 2, (self.col_cuts[j+1] + self.col_cuts[j]) * self.W / 2),
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'flight_time': flight_time,
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'bs_time': bs_time,
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'is_visited': False
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}
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if not valid_partition:
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break
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if not valid_partition:
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reward = -10
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# 状态：前 4 维为 partition_values，其余为区域访问状态（初始全0）
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max_regions = (self.CUT_NUM // 2 + 1) ** 2
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state = np.concatenate([
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self.partition_values,
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np.zeros(max_regions, dtype=np.float32),
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[0.0]
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])
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return state, reward, True, False, {}
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else:
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# 进入阶段 1：初始化迷宫
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self.phase = 1
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reward = 0.2
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# 构建反向索引，方便后续计算
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self.reverse_rectangles = {
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v['center']: k for k, v in self.rectangles.items()}
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region_centers = [
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(i, j, self.rectangles[(i, j)]['center'])
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for i in range(len(self.row_cuts) - 1)
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for j in range(len(self.col_cuts) - 1)
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]
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# 按照与区域中心的距离从近到远排序
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region_centers.sort(
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key=lambda x: math.dist(x[2], (self.H / 2, self.W / 2))
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)
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# 分配最近的区域给每辆车
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for idx in range(self.num_cars):
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i, j, center = region_centers[idx]
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self.car_pos[idx] = center
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self.car_traj[idx].append((i, j))
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self.rectangles[(i, j)]['is_visited'] = True
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# 进入阶段 2：走迷宫
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self.phase = 2
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# 构造访问状态向量
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max_regions = (self.CUT_NUM // 2 + 1) ** 2
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visit_status = np.zeros(max_regions, dtype=np.float32)
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# 将实际区域的访问状态填入向量
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for i in range(len(self.row_cuts) - 1):
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for j in range(len(self.col_cuts) - 1):
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idx = i * (len(self.col_cuts) - 1) + j
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visit_status[idx] = float(
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self.rectangles[(i, j)]['is_visited'])
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for i in range(idx + 1, max_regions):
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visit_status[i] = 100
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state = np.concatenate(
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[self.partition_values, visit_status, [0.0]])
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return state, reward, False, False, {}
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elif self.phase == 2:
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# 阶段 2：路径规划（走迷宫）
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current_car = self.current_car_index
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# 查表，找出当前车辆所在的网格
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current_row, current_col = self.reverse_rectangles[self.car_pos[current_car]]
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reward = 0
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# 当前动作 a 为 1 维连续动作，映射到四个方向
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if a < 0.2:
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move_dir = 'up'
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elif a < 0.4:
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move_dir = 'down'
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elif a < 0.6:
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move_dir = 'left'
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elif a < 0.8:
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move_dir = 'right'
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else:
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move_dir = 'stay'
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# 初始化新的行、列为当前值
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new_row, new_col = current_row, current_col
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if move_dir == 'up':
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if current_row > 0:
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new_row = current_row - 1
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else: # 错误的移动给一些惩罚？
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new_row = current_row
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# reward -= 1
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elif move_dir == 'down':
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if current_row < len(self.row_cuts) - 2:
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new_row = current_row + 1
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else:
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new_row = current_row
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# reward -= 1
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elif move_dir == 'left':
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if current_col > 0:
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new_col = current_col - 1
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else:
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new_col = current_col
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# reward -= 1
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elif move_dir == 'right':
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if current_col < len(self.col_cuts) - 2:
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new_col = current_col + 1
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else:
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new_col = current_col
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# reward -= 1
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# 如果移动不合法，或者动作为stay，则保持原位置
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# 检查是否移动
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car_moved = (new_row != current_row or new_col != current_col)
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# 更新车辆位置
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self.car_pos[current_car] = self.rectangles[(
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new_row, new_col)]['center']
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if car_moved:
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self.car_traj[current_car].append((new_row, new_col))
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# 更新访问标记：将新网格标记为已访问
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self.rectangles[(new_row, new_col)]['is_visited'] = True
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# 记录所有车辆一轮中是否移动
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if self.current_car_index == 0:
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# 新一轮的开始，初始化移动标记
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self.cars_moved = [False] * self.num_cars
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self.cars_moved[current_car] = car_moved
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# 计算当前的 T 值
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current_T = max([self._compute_motorcade_time(idx)
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for idx in range(self.num_cars)])
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# 如果一轮结束，检查是否所有车辆都没有移动
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if self.current_car_index == (self.num_cars - 1) and not any(self.cars_moved):
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# 增加时间 BASE_LINE / T * 10
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self.delay_time += self.BASE_LINE * (1 / self.MAX_STEPS)
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real_T = current_T + self.delay_time
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self.step_count += 1
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self.current_car_index = (
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self.current_car_index + 1) % self.num_cars
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# 观察状态
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# 构造访问状态向量
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max_regions = (self.CUT_NUM // 2 + 1) ** 2
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visit_status = np.zeros(max_regions, dtype=np.float32)
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# 将实际区域的访问状态填入向量
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for i in range(len(self.row_cuts) - 1):
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for j in range(len(self.col_cuts) - 1):
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idx = i * (len(self.col_cuts) - 1) + j
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visit_status[idx] = float(
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self.rectangles[(i, j)]['is_visited'])
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for i in range(idx + 1, max_regions):
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visit_status[i] = 100
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# 在状态向量最后增加一维，表示当前的 T 值
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state = np.concatenate(
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[self.partition_values, visit_status, [real_T]])
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# Episode 终止条件：所有网格均被访问或步数达到上限
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done = all([value['is_visited'] for _, value in self.rectangles.items()]) or (
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self.step_count >= self.MAX_STEPS)
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if done and all([value['is_visited'] for _, value in self.rectangles.items()]):
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# # 区域覆盖完毕，根据轨迹计算各车队的执行时间
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# T = max([self._compute_motorcade_time(idx)
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# for idx in range(self.num_cars)])
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# # TODO 让奖励在baseline附近变化更剧烈
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# # reward = math.exp(-T / self.BASE_LINE) * 1000
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reward += self.BASE_LINE / real_T * 5
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# if reward > self.BASE_LINE:
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# reward -= 200
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# # TODO 计算len(self.car_traj)的值，需要修改轨迹记录法则
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# reward -= 10 * self.step_count
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# TODO 动态调整baseline
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elif done and self.step_count >= self.MAX_STEPS:
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reward += -5
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return state, reward, done, False, {}
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def _compute_motorcade_time(self, idx):
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flight_time = sum(self.rectangles[tuple(point)]['flight_time']
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for point in self.car_traj[idx])
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bs_time = sum(self.rectangles[tuple(point)]['bs_time']
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for point in self.car_traj[idx])
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# 计算车的移动时间，首先在轨迹的首尾添加上大区域中心
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car_time = 0
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for i in range(len(self.car_traj[idx]) - 1):
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first_point = self.car_traj[idx][i]
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second_point = self.car_traj[idx][i + 1]
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car_time += math.dist(self.rectangles[first_point]['center'], self.rectangles[second_point]['center']) * \
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self.car_time_factor
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car_time += math.dist(self.rectangles[self.car_traj[idx][0]]['center'], [
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self.H / 2, self.W / 2]) * self.car_time_factor
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car_time += math.dist(self.rectangles[self.car_traj[idx][-1]]['center'], [
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self.H / 2, self.W / 2]) * self.car_time_factor
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return max(float(car_time) + flight_time, bs_time)
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def render(self):
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if self.phase == 1:
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print("Phase 1: Initialize maze environment.")
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print(f"Partition values so far: {self.partition_values}")
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print(f"Motorcade positon: {self.car_pos}")
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# input('1111')
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elif self.phase == 2:
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print("Phase 2: Play maze.")
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print(f'Motorcade trajectory: {self.car_traj}')
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# input('2222')
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