Files
MAGAIL4AutoDrive/Env/bc_env.py
2026-03-02 10:58:20 +08:00

247 lines
11 KiB
Python

from Env.scenario_env import MultiAgentScenarioEnv
from Env.hbbc_background_policy import HBBCBackgroundController
from Env.utils import filter_traffic_tracks_to_birth_lists
from metadrive.component.vehicle.vehicle_type import DefaultVehicle
import numpy as np
class BCScenarioEnv(MultiAgentScenarioEnv):
"""
Environment for Behavior Cloning Evaluation.
Uses the same 45-dim observation as ExpertReplayEnv:
- Ego State (5): x, y, vx, vy, heading
- Neighbors (40): 10 nearest * (rel_x, rel_y, vx, vy)
Spawns background (static) vehicles so that observation distribution matches expert data collection:
expert data is generated with ExpertReplayEnv which includes bg_* in active_agents, so the policy
was trained on obs that can include those neighbors. Demo should use the same scene for consistency.
"""
def _init_hbbc_background(self):
self.enable_hbbc_background = bool(self.config.get("enable_hbbc_background", False))
self.hbbc_dynamic_agents = {}
self._spawned_dynamic_bg_ids = set()
self.hbbc_controller = None
if not self.enable_hbbc_background:
return
self.hbbc_controller = HBBCBackgroundController(
model_path=self.config.get("hbbc_model_path", "models/hbbc/hbbc.pt"),
device=self.config.get("hbbc_inference_device", "cpu"),
latent_mode=self.config.get("hbbc_latent_mode", "per_vehicle_fixed"),
latent_json_path=self.config.get("hbbc_latent_json_path"),
seed=int(self.config.get("seed", 0)),
dt=float(self.config.get("hbbc_dt", 0.1)),
)
self.hbbc_controller.reset_episode()
def _move_excess_controlled_to_hbbc_background(self):
if not self.enable_hbbc_background:
return
keep_n = int(self.config.get("num_controlled_agents", 0))
keep_n = max(0, keep_n)
ordered_ids = list(self.controlled_agents.keys())
keep_ids = set(ordered_ids[:keep_n])
move_ids = [aid for aid in ordered_ids if aid not in keep_ids]
for aid in move_ids:
self.hbbc_dynamic_agents[aid] = self.controlled_agents[aid]
self.controlled_agents.pop(aid, None)
if aid in self.controlled_agent_ids:
self.controlled_agent_ids.remove(aid)
self._spawned_dynamic_bg_ids.update(move_ids)
def _apply_hbbc_before_step(self):
if not self.enable_hbbc_background or not self.hbbc_dynamic_agents:
return
batch = []
for aid, vehicle in self.hbbc_dynamic_agents.items():
object_id = getattr(vehicle, "original_id", None) or aid.replace("controlled_", "", 1)
batch.append((aid, vehicle, str(object_id) if object_id is not None else None, aid))
actions = self.hbbc_controller.infer_actions(batch)
for aid, vehicle in self.hbbc_dynamic_agents.items():
action = actions.get(aid, np.zeros(2, dtype=np.float32))
vehicle.before_step(action)
def _apply_hbbc_after_step(self):
if not self.enable_hbbc_background:
return
for vehicle in self.hbbc_dynamic_agents.values():
vehicle.after_step()
def reset(self, seed=None):
self._init_hbbc_background()
# Clear background vehicles from previous episode so engine.reset() passes _object_clean_check
if getattr(self, "engine", None) is not None:
ids_bg = [
oid for oid, obj in self.engine.get_objects().items()
if (getattr(obj, "name", None) or getattr(obj, "id", None) or "").startswith(("bg_", "controlled_"))
]
if ids_bg:
self.engine.clear_objects(ids_bg, force_destroy=True)
for aid in list(self.engine.agent_manager.active_agents.keys()):
if aid.startswith("bg_") or aid.startswith("controlled_"):
self.engine.agent_manager.active_agents.pop(aid, None)
obs = super().reset(seed=seed)
self._move_excess_controlled_to_hbbc_background()
self._spawn_background_vehicles()
return self._get_all_obs()
def _build_birth_lists_from_traffic(self):
"""Same lane/static filter as expert data; return background_vehicles so we spawn them (match training obs)."""
car_birth_info_list, background_vehicles, obj_to_clean, stats = filter_traffic_tracks_to_birth_lists(
self.engine.traffic_manager.current_traffic_data,
self.engine.traffic_manager.sdc_scenario_id,
self.engine.map_manager,
return_stats=True,
)
if stats["n_controlled"] == 0 and stats["n_total"] > 0:
print(
"[BCScenarioEnv] 0 controlled agents: total_vehicles={}, off_lane={}, static={}, no_valid={}.".format(
stats["n_total"],
stats["n_off_lane"],
stats["n_static"],
stats["n_no_valid"],
)
)
return car_birth_info_list, background_vehicles, obj_to_clean
def _spawn_background_vehicles(self):
"""Spawn all static background vehicles once at reset (no show_time filter; same as ExpertReplayEnv)."""
for sid, car in self.background_vehicles.items():
bg_id = f"bg_{car['id']}"
if bg_id in self.engine.agent_manager.active_agents:
continue
vehicle_config = {}
if "length" in car and "width" in car:
vehicle_config = {"length": car["length"], "width": car["width"]}
v = self.engine.spawn_object(
DefaultVehicle,
name=bg_id,
vehicle_config=vehicle_config,
position=car["begin"],
heading=car["heading"],
)
v.set_velocity([0, 0])
self.engine.agent_manager.active_agents[bg_id] = v
v.valid_mask = car.get("valid")
v.start_t = car.get("show_time")
def _update_background_vehicles(self):
# Static vehicles are spawned once at init and never removed.
pass
def step(self, action_dict):
if action_dict is None:
action_dict = {}
self.round += 1
for agent_id, action in action_dict.items():
if agent_id in self.controlled_agents:
self.controlled_agents[agent_id].before_step(action)
self._apply_hbbc_before_step()
self.engine.step()
self.engine.after_step()
for agent_id in action_dict:
if agent_id in self.controlled_agents:
self.controlled_agents[agent_id].after_step()
self._spawn_controlled_agents()
self._move_excess_controlled_to_hbbc_background()
self._apply_hbbc_after_step()
self._update_background_vehicles()
obs = self._get_all_obs()
# Reward shaping for evaluation/rollout monitoring (BC training itself doesn't use env reward).
speed_coef = float(self.config.get("reward_speed_coef", 0.05))
collision_distance = float(self.config.get("collision_distance", 6.0))
collision_penalty = float(self.config.get("collision_penalty", 100.0))
# Pre-collect all active vehicles (includes background vehicles).
active_agents = list(self.engine.agent_manager.active_agents.items())
rewards = {}
infos = {}
for aid, vehicle in self.controlled_agents.items():
# Speed reward
speed = getattr(vehicle, "speed", None)
if speed is None:
speed = float(np.linalg.norm(vehicle.velocity))
r_speed = speed_coef * float(speed)
# Near-collision penalty (distance-based, simulator-agnostic)
min_dist = float("inf")
for other_id, other_vehicle in active_agents:
if other_id == aid:
continue
try:
dist = float(np.linalg.norm(vehicle.position - other_vehicle.position))
except Exception:
continue
if dist < min_dist:
min_dist = dist
near_collision = bool(min_dist < collision_distance)
r_collision = -collision_penalty if near_collision else 0.0
rewards[aid] = float(r_speed + r_collision)
infos[aid] = {
"near_collision": near_collision,
"min_dist": (min_dist if np.isfinite(min_dist) else None),
"r_speed": float(r_speed),
"r_collision": float(r_collision),
}
dones = {aid: False for aid in self.controlled_agents}
dones["__all__"] = self.episode_step >= self.config["horizon"]
return obs, rewards, dones, infos
def _get_all_obs(self):
# Implement custom observation: 30m range, 10 nearest vehicles
obs_dict = {}
for agent_id, vehicle in self.controlled_agents.items():
# 1. Ego State
ego_state = [
vehicle.position[0], vehicle.position[1],
vehicle.velocity[0], vehicle.velocity[1],
vehicle.heading_theta
]
# 2. Neighbors
neighbors = []
# Iterate through all vehicles in the engine
candidates = []
# Use engine.agent_manager.active_agents to find neighbors
# Note: This includes background vehicles if they are in active_agents
for other_id, other_vehicle in self.engine.agent_manager.active_agents.items():
if other_id == agent_id:
continue
# Check if vehicle is valid/active
# (MetaDrive manages active_agents, so they should be active)
dist = np.linalg.norm(vehicle.position - other_vehicle.position)
if dist < 30.0:
candidates.append((dist, other_vehicle))
# Sort by distance
candidates.sort(key=lambda x: x[0])
# Take top 10
top_10 = candidates[:10]
neighbor_feats = []
for _, neighbor in top_10:
neighbor_feats.extend([
neighbor.position[0] - vehicle.position[0], # Relative pos
neighbor.position[1] - vehicle.position[1],
neighbor.velocity[0], # Absolute vel
neighbor.velocity[1]
])
# Pad if < 10
missing = 10 - len(top_10)
if missing > 0:
neighbor_feats.extend([0.0] * (4 * missing))
# Flatten
obs = np.array(ego_state + neighbor_feats, dtype=np.float32)
obs_dict[agent_id] = obs
return obs_dict