diff --git a/flatland/contrib/interface/flatland_env.py b/flatland/contrib/interface/flatland_env.py
new file mode 100644
index 0000000000000000000000000000000000000000..584621a6313e7ecda1281e06ad44a6669164ef85
--- /dev/null
+++ b/flatland/contrib/interface/flatland_env.py
@@ -0,0 +1,353 @@
+import os
+import math
+import numpy as np
+import gym
+from gym.utils import seeding
+from pettingzoo import AECEnv
+from pettingzoo.utils import agent_selector
+from pettingzoo.utils import wrappers
+from gym.utils import EzPickle
+from pettingzoo.utils.conversions import to_parallel_wrapper
+from flatland.envs.rail_env import RailEnv
+from mava.wrappers.flatland import infer_observation_space, normalize_observation
+from functools import partial
+from flatland.envs.observations import GlobalObsForRailEnv, TreeObsForRailEnv
+
+
+"""Adapted from
+- https://github.com/PettingZoo-Team/PettingZoo/blob/HEAD/pettingzoo/butterfly/pistonball/pistonball.py
+- https://github.com/instadeepai/Mava/blob/HEAD/mava/wrappers/flatland.py
+"""
+
+def parallel_wrapper_fn(env_fn):
+ def par_fn(**kwargs):
+ env = env_fn(**kwargs)
+ env = custom_parallel_wrapper(env)
+ return env
+ return par_fn
+
+def env(**kwargs):
+ env = raw_env(**kwargs)
+ # env = wrappers.AssertOutOfBoundsWrapper(env)
+ # env = wrappers.OrderEnforcingWrapper(env)
+ return env
+
+
+parallel_env = parallel_wrapper_fn(env)
+
+class custom_parallel_wrapper(to_parallel_wrapper):
+
+ def step(self, actions):
+ rewards = {a: 0 for a in self.aec_env.agents}
+ dones = {}
+ infos = {}
+ observations = {}
+
+ for agent in self.aec_env.agents:
+ try:
+ assert agent == self.aec_env.agent_selection, f"expected agent {agent} got agent {self.aec_env.agent_selection}, agent order is nontrivial"
+ except Exception as e:
+ # print(e)
+ print(self.aec_env.dones.values())
+ raise e
+ obs, rew, done, info = self.aec_env.last()
+ self.aec_env.step(actions.get(agent,0))
+ for agent in self.aec_env.agents:
+ rewards[agent] += self.aec_env.rewards[agent]
+
+ dones = dict(**self.aec_env.dones)
+ infos = dict(**self.aec_env.infos)
+ self.agents = self.aec_env.agents
+ observations = {agent: self.aec_env.observe(agent) for agent in self.aec_env.agents}
+ return observations, rewards, dones, infos
+
+class raw_env(AECEnv, gym.Env):
+
+ metadata = {'render.modes': ['human', "rgb_array"], 'name': "flatland_pettingzoo",
+ 'video.frames_per_second': 10,
+ 'semantics.autoreset': False }
+
+ def __init__(self, environment = False, preprocessor = False, agent_info = False, use_renderer=False, *args, **kwargs):
+ # EzPickle.__init__(self, *args, **kwargs)
+ self._environment = environment
+ self.use_renderer = use_renderer
+ self.renderer = None
+ if self.use_renderer:
+ self.initialize_renderer()
+
+ n_agents = self.num_agents
+ self._agents = [get_agent_keys(i) for i in range(n_agents)]
+ self._possible_agents = self.agents[:]
+ self._reset_next_step = True
+
+ self._agent_selector = agent_selector(self.agents)
+
+ self.num_actions = 5
+
+ self.action_spaces = {
+ agent: gym.spaces.Discrete(self.num_actions) for agent in self.possible_agents
+ }
+
+ self.seed()
+ # preprocessor must be for observation builders other than global obs
+ # treeobs builders would use the default preprocessor if none is
+ # supplied
+ self.preprocessor = self._obtain_preprocessor(preprocessor)
+
+ self._include_agent_info = agent_info
+
+ # observation space:
+ # flatland defines no observation space for an agent. Here we try
+ # to define the observation space. All agents are identical and would
+ # have the same observation space.
+ # Infer observation space based on returned observation
+ obs, _ = self._environment.reset(regenerate_rail = False, regenerate_schedule = False)
+ obs = self.preprocessor(obs)
+ self.observation_spaces = {
+ i: infer_observation_space(ob) for i, ob in obs.items()
+ }
+
+
+ @property
+ def environment(self) -> RailEnv:
+ """Returns the wrapped environment."""
+ return self._environment
+
+ @property
+ def dones(self):
+ dones = self._environment.dones
+ # remove_all = dones.pop("__all__", None)
+ return {get_agent_keys(key): value for key, value in dones.items()}
+
+ @property
+ def obs_builder(self):
+ return self._environment.obs_builder
+
+ @property
+ def width(self):
+ return self._environment.width
+
+ @property
+ def height(self):
+ return self._environment.height
+
+ @property
+ def agents_data(self):
+ """Rail Env Agents data."""
+ return self._environment.agents
+
+ @property
+ def num_agents(self) -> int:
+ """Returns the number of trains/agents in the flatland environment"""
+ return int(self._environment.number_of_agents)
+
+ # def __getattr__(self, name):
+ # """Expose any other attributes of the underlying environment."""
+ # return getattr(self._environment, name)
+
+ @property
+ def agents(self):
+ return self._agents
+
+ @property
+ def possible_agents(self):
+ return self._possible_agents
+
+ def env_done(self):
+ return self._environment.dones["__all__"] or not self.agents
+
+ def observe(self,agent):
+ return self.obs.get(agent)
+
+ def last(self, observe=True):
+ '''
+ returns observation, reward, done, info for the current agent (specified by self.agent_selection)
+ '''
+ agent = self.agent_selection
+ observation = self.observe(agent) if observe else None
+ return observation, self.rewards.get(agent), self.dones.get(agent), self.infos.get(agent)
+
+ def seed(self, seed: int = None) -> None:
+ self._environment._seed(seed)
+
+ def state(self):
+ '''
+ Returns an observation of the global environment
+ '''
+ return None
+
+ def _clear_rewards(self):
+ '''
+ clears all items in .rewards
+ '''
+ # pass
+ for agent in self.rewards:
+ self.rewards[agent] = 0
+
+ def reset(self, *args, **kwargs):
+ self._reset_next_step = False
+ self._agents = self.possible_agents[:]
+ if self.use_renderer:
+ if self.renderer: #TODO: Errors with RLLib with renderer as None.
+ self.renderer.reset()
+ obs, info = self._environment.reset(*args, **kwargs)
+ observations = self._collate_obs_and_info(obs, info)
+ self._agent_selector.reinit(self.agents)
+ self.agent_selection = self._agent_selector.next()
+ self.rewards = dict(zip(self.agents, [0 for _ in self.agents]))
+ self._cumulative_rewards = dict(zip(self.agents, [0 for _ in self.agents]))
+ self.action_dict = {get_agent_handle(i):0 for i in self.possible_agents}
+
+ return observations
+
+ def step(self, action):
+
+ if self.env_done():
+ self._agents = []
+ self._reset_next_step = True
+ return self.last()
+
+ agent = self.agent_selection
+ self.action_dict[get_agent_handle(agent)] = action
+
+ if self.dones[agent]:
+ # Disabled.. In case we want to remove agents once done
+ # if self.remove_agents:
+ # self.agents.remove(agent)
+ if self._agent_selector.is_last():
+ observations, rewards, dones, infos = self._environment.step(self.action_dict)
+ self.rewards = {get_agent_keys(key): value for key, value in rewards.items()}
+ if observations:
+ observations = self._collate_obs_and_info(observations, infos)
+ self._accumulate_rewards()
+ obs, cumulative_reward, done, info = self.last()
+ self.agent_selection = self._agent_selector.next()
+
+ else:
+ self._clear_rewards()
+ obs, cumulative_reward, done, info = self.last()
+ self.agent_selection = self._agent_selector.next()
+
+ return obs, cumulative_reward, done, info
+
+ if self._agent_selector.is_last():
+ observations, rewards, dones, infos = self._environment.step(self.action_dict)
+ self.rewards = {get_agent_keys(key): value for key, value in rewards.items()}
+ if observations:
+ observations = self._collate_obs_and_info(observations, infos)
+
+ else:
+ self._clear_rewards()
+
+ # self._cumulative_rewards[agent] = 0
+ self._accumulate_rewards()
+
+ obs, cumulative_reward, done, info = self.last()
+
+ self.agent_selection = self._agent_selector.next()
+
+ return obs, cumulative_reward, done, info
+
+
+ # collate agent info and observation into a tuple, making the agents obervation to
+ # be a tuple of the observation from the env and the agent info
+ def _collate_obs_and_info(self, observes, info):
+ observations = {}
+ infos = {}
+ observes = self.preprocessor(observes)
+ for agent, obs in observes.items():
+ all_infos = {k: info[k][get_agent_handle(agent)] for k in info.keys()}
+ agent_info = np.array(
+ list(all_infos.values()), dtype=np.float32
+ )
+ infos[agent] = all_infos
+ obs = (obs, agent_info) if self._include_agent_info else obs
+ observations[agent] = obs
+
+ self.infos = infos
+ self.obs = observations
+ return observations
+
+
+ def render(self, mode='human'):
+ """
+ This methods provides the option to render the
+ environment's behavior to a window which should be
+ readable to the human eye if mode is set to 'human'.
+ """
+ if not self.use_renderer:
+ return
+
+ if not self.renderer:
+ self.initialize_renderer(mode=mode)
+
+ return self.update_renderer(mode=mode)
+
+ def initialize_renderer(self, mode="human"):
+ # Initiate the renderer
+ from flatland.utils.rendertools import RenderTool, AgentRenderVariant
+ self.renderer = RenderTool(self.environment, gl="PGL", # gl="TKPILSVG",
+ agent_render_variant=AgentRenderVariant.ONE_STEP_BEHIND,
+ show_debug=False,
+ screen_height=600, # Adjust these parameters to fit your resolution
+ screen_width=800) # Adjust these parameters to fit your resolution
+ self.renderer.show = False
+
+ def update_renderer(self, mode='human'):
+ image = self.renderer.render_env(show=False, show_observations=False, show_predictions=False,
+ return_image=True)
+ return image[:,:,:3]
+
+ def set_renderer(self, renderer):
+ self.use_renderer = renderer
+ if self.use_renderer:
+ self.initialize_renderer(mode=self.use_renderer)
+
+ def close(self):
+ # self._environment.close()
+ if self.renderer:
+ try:
+ if self.renderer.show:
+ self.renderer.close_window()
+ except Exception as e:
+ print("Could Not close window due to:",e)
+ self.renderer = None
+
+ def _obtain_preprocessor(
+ self, preprocessor):
+ """Obtains the actual preprocessor to be used based on the supplied
+ preprocessor and the env's obs_builder object"""
+ if not isinstance(self.obs_builder, GlobalObsForRailEnv):
+ _preprocessor = preprocessor if preprocessor else lambda x: x
+ if isinstance(self.obs_builder, TreeObsForRailEnv):
+ _preprocessor = (
+ partial(
+ normalize_observation, tree_depth=self.obs_builder.max_depth
+ )
+ if not preprocessor
+ else preprocessor
+ )
+ assert _preprocessor is not None
+ else:
+ def _preprocessor(x):
+ return x
+
+ def returned_preprocessor(obs):
+ temp_obs = {}
+ for agent_id, ob in obs.items():
+ temp_obs[get_agent_keys(agent_id)] = _preprocessor(ob)
+ return temp_obs
+
+ return returned_preprocessor
+
+# Utility functions
+def convert_np_type(dtype, value):
+ return np.dtype(dtype).type(value)
+
+def get_agent_handle(id):
+ """Obtain an agents handle given its id"""
+ return int(id)
+
+def get_agent_keys(id):
+ """Obtain an agents handle given its id"""
+ return str(id)
\ No newline at end of file
diff --git a/flatland/contrib/requirements_training.txt b/flatland/contrib/requirements_training.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d9cc58ceea0db826685dc20907a36b7eaa3aabfd
--- /dev/null
+++ b/flatland/contrib/requirements_training.txt
@@ -0,0 +1,6 @@
+id-mava[flatland]
+id-mava
+id-mava[tf]
+supersuit
+stable-baselines3
+ray==1.5.2
\ No newline at end of file
diff --git a/flatland/contrib/training/flatland_pettingzoo_rllib.py b/flatland/contrib/training/flatland_pettingzoo_rllib.py
new file mode 100644
index 0000000000000000000000000000000000000000..beb2a07681a973a79abfed4affbd4f3fb9dd256c
--- /dev/null
+++ b/flatland/contrib/training/flatland_pettingzoo_rllib.py
@@ -0,0 +1,78 @@
+from ray import tune
+from ray.tune.registry import register_env
+# from ray.rllib.utils import try_import_tf
+from ray.rllib.env.wrappers.pettingzoo_env import ParallelPettingZooEnv
+import numpy as np
+
+from flatland.contrib.interface import flatland_env
+from flatland.contrib.utils import env_generators
+
+from flatland.envs.observations import TreeObsForRailEnv
+from flatland.envs.predictions import ShortestPathPredictorForRailEnv
+
+
+# Custom observation builder with predictor, uncomment line below if you want to try this one
+observation_builder = TreeObsForRailEnv(max_depth=2, predictor=ShortestPathPredictorForRailEnv(30))
+seed = 10
+np.random.seed(seed)
+wandb_log = False
+experiment_name = "flatland_pettingzoo"
+rail_env = env_generators.small_v0(seed, observation_builder)
+
+# __sphinx_doc_begin__
+
+
+def env_creator(args):
+ env = flatland_env.parallel_env(environment=rail_env, use_renderer=False)
+ return env
+
+
+if __name__ == "__main__":
+ env_name = "flatland_pettyzoo"
+
+ register_env(env_name, lambda config: ParallelPettingZooEnv(env_creator(config)))
+
+ test_env = ParallelPettingZooEnv(env_creator({}))
+ obs_space = test_env.observation_space
+ act_space = test_env.action_space
+
+ def gen_policy(i):
+ config = {
+ "gamma": 0.99,
+ }
+ return (None, obs_space, act_space, config)
+
+ policies = {"policy_0": gen_policy(0)}
+
+ policy_ids = list(policies.keys())
+
+ tune.run(
+ "PPO",
+ name="PPO",
+ stop={"timesteps_total": 5000000},
+ checkpoint_freq=10,
+ local_dir="~/ray_results/"+env_name,
+ config={
+ # Environment specific
+ "env": env_name,
+ # https://github.com/ray-project/ray/issues/10761
+ "no_done_at_end": True,
+ # "soft_horizon" : True,
+ "num_gpus": 0,
+ "num_workers": 2,
+ "num_envs_per_worker": 1,
+ "compress_observations": False,
+ "batch_mode": 'truncate_episodes',
+ "clip_rewards": False,
+ "vf_clip_param": 500.0,
+ "entropy_coeff": 0.01,
+ # effective batch_size: train_batch_size * num_agents_in_each_environment [5, 10]
+ # see https://github.com/ray-project/ray/issues/4628
+ "train_batch_size": 1000, # 5000
+ "rollout_fragment_length": 50, # 100
+ "sgd_minibatch_size": 100, # 500
+ "vf_share_layers": False
+ },
+ )
+
+# __sphinx_doc_end__
diff --git a/flatland/contrib/training/flatland_pettingzoo_stable_baselines.py b/flatland/contrib/training/flatland_pettingzoo_stable_baselines.py
new file mode 100644
index 0000000000000000000000000000000000000000..f88a068f9d226e151ec8b524e8bb2643595b120f
--- /dev/null
+++ b/flatland/contrib/training/flatland_pettingzoo_stable_baselines.py
@@ -0,0 +1,127 @@
+
+import numpy as np
+import os
+import PIL
+import shutil
+
+from stable_baselines3.ppo import MlpPolicy
+from stable_baselines3 import PPO
+
+import supersuit as ss
+
+from flatland.contrib.interface import flatland_env
+from flatland.contrib.utils import env_generators
+
+from flatland.envs.observations import TreeObsForRailEnv
+from flatland.envs.predictions import ShortestPathPredictorForRailEnv
+
+import fnmatch
+import wandb
+
+"""
+https://github.com/PettingZoo-Team/PettingZoo/blob/HEAD/tutorials/13_lines.py
+"""
+
+# Custom observation builder without predictor
+# observation_builder = GlobalObsForRailEnv()
+
+# Custom observation builder with predictor
+observation_builder = TreeObsForRailEnv(max_depth=2, predictor=ShortestPathPredictorForRailEnv(30))
+seed = 10
+np.random.seed(seed)
+wandb_log = False
+experiment_name = "flatland_pettingzoo"
+
+try:
+ if os.path.isdir(experiment_name):
+ shutil.rmtree(experiment_name)
+ os.mkdir(experiment_name)
+except OSError as e:
+ print("Error: %s - %s." % (e.filename, e.strerror))
+
+# rail_env = env_generators.sparse_env_small(seed, observation_builder)
+rail_env = env_generators.small_v0(seed, observation_builder)
+
+# __sphinx_doc_begin__
+
+env = flatland_env.parallel_env(environment=rail_env, use_renderer=False)
+# env = flatland_env.env(environment = rail_env, use_renderer = False)
+
+if wandb_log:
+ run = wandb.init(project="flatland2021", entity="nilabha2007", sync_tensorboard=True,
+ config={}, name=experiment_name, save_code=True)
+
+env_steps = 1000 # 2 * env.width * env.height # Code uses 1.5 to calculate max_steps
+rollout_fragment_length = 50
+env = ss.pettingzoo_env_to_vec_env_v0(env)
+# env.black_death = True
+env = ss.concat_vec_envs_v0(env, 1, num_cpus=1, base_class='stable_baselines3')
+
+model = PPO(MlpPolicy, env, tensorboard_log=f"/tmp/{experiment_name}", verbose=3, gamma=0.95,
+ n_steps=rollout_fragment_length, ent_coef=0.01,
+ learning_rate=5e-5, vf_coef=1, max_grad_norm=0.9, gae_lambda=1.0, n_epochs=30, clip_range=0.3,
+ batch_size=150, seed=seed)
+# wandb.watch(model.policy.action_net,log='all', log_freq = 1)
+# wandb.watch(model.policy.value_net, log='all', log_freq = 1)
+train_timesteps = 100000
+model.learn(total_timesteps=train_timesteps)
+model.save(f"policy_flatland_{train_timesteps}")
+
+# __sphinx_doc_end__
+
+model = PPO.load(f"policy_flatland_{train_timesteps}")
+
+env = flatland_env.env(environment=rail_env, use_renderer=True)
+
+if wandb_log:
+ artifact = wandb.Artifact('model', type='model')
+ artifact.add_file(f'policy_flatland_{train_timesteps}.zip')
+ run.log_artifact(artifact)
+
+
+# Model Interference
+
+seed = 100
+env.reset(random_seed=seed)
+step = 0
+ep_no = 0
+frame_list = []
+while ep_no < 1:
+ for agent in env.agent_iter():
+ obs, reward, done, info = env.last()
+ act = model.predict(obs, deterministic=True)[0] if not done else None
+ env.step(act)
+ frame_list.append(PIL.Image.fromarray(env.render(mode='rgb_array')))
+ step += 1
+ if step % 100 == 0:
+ print(f"env step:{step} and action taken:{act}")
+ completion = env_generators.perc_completion(env)
+ print("Agents Completed:", completion)
+
+ completion = env_generators.perc_completion(env)
+ print("Final Agents Completed:", completion)
+ ep_no += 1
+ frame_list[0].save(f"{experiment_name}{os.sep}pettyzoo_out_{ep_no}.gif", save_all=True,
+ append_images=frame_list[1:], duration=3, loop=0)
+ frame_list = []
+ env.close()
+ env.reset(random_seed=seed+ep_no)
+
+
+def find(pattern, path):
+ result = []
+ for root, dirs, files in os.walk(path):
+ for name in files:
+ if fnmatch.fnmatch(name, pattern):
+ result.append(os.path.join(root, name))
+ return result
+
+
+if wandb_log:
+ extn = "gif"
+ _video_file = f'*.{extn}'
+ _found_videos = find(_video_file, experiment_name)
+ print(_found_videos)
+ for _found_video in _found_videos:
+ wandb.log({_found_video: wandb.Video(_found_video, format=extn)})
+ run.join()
diff --git a/flatland/contrib/utils/env_generators.py b/flatland/contrib/utils/env_generators.py
new file mode 100644
index 0000000000000000000000000000000000000000..38c6d987acbd8d8c5996d7e4130b7f4ead4bc502
--- /dev/null
+++ b/flatland/contrib/utils/env_generators.py
@@ -0,0 +1,236 @@
+import logging
+import random
+import numpy as np
+from typing import NamedTuple
+
+from flatland.envs.malfunction_generators import malfunction_from_params, MalfunctionParameters, ParamMalfunctionGen, no_malfunction_generator
+from flatland.envs.rail_env import RailEnv
+from flatland.envs.rail_generators import sparse_rail_generator
+from flatland.envs.line_generators import sparse_line_generator
+from flatland.envs.agent_utils import RailAgentStatus
+from flatland.core.grid.grid4_utils import get_new_position
+
+MalfunctionParameters = NamedTuple('MalfunctionParameters', [('malfunction_rate', float), ('min_duration', int), ('max_duration', int)])
+
+
+def get_shortest_path_action(env,handle):
+ distance_map = env.distance_map.get()
+
+ agent = env.agents[handle]
+
+ if agent.status == RailAgentStatus.READY_TO_DEPART:
+ agent_virtual_position = agent.initial_position
+ elif agent.status == RailAgentStatus.ACTIVE:
+ agent_virtual_position = agent.position
+ elif agent.status == RailAgentStatus.DONE:
+ agent_virtual_position = agent.target
+ else:
+ return None
+
+ if agent.position:
+ possible_transitions = env.rail.get_transitions(
+ *agent.position, agent.direction)
+ else:
+ possible_transitions = env.rail.get_transitions(
+ *agent.initial_position, agent.direction)
+
+ num_transitions = np.count_nonzero(possible_transitions)
+
+ min_distances = []
+ for direction in [(agent.direction + i) % 4 for i in range(-1, 2)]:
+ if possible_transitions[direction]:
+ new_position = get_new_position(
+ agent_virtual_position, direction)
+ min_distances.append(
+ distance_map[handle, new_position[0],
+ new_position[1], direction])
+ else:
+ min_distances.append(np.inf)
+
+ if num_transitions == 1:
+ observation = [0, 1, 0]
+
+ elif num_transitions == 2:
+ idx = np.argpartition(np.array(min_distances), 2)
+ observation = [0, 0, 0]
+ observation[idx[0]] = 1
+ return np.argmax(observation) + 1
+
+
+def small_v0(random_seed, observation_builder, max_width = 35, max_height = 35):
+ random.seed(random_seed)
+ width = 30
+ height = 30
+ nr_trains = 5
+ max_num_cities = 4
+ grid_mode = False
+ max_rails_between_cities = 2
+ max_rails_in_city = 3
+
+ malfunction_rate = 0
+ malfunction_min_duration = 0
+ malfunction_max_duration = 0
+
+ rail_generator = sparse_rail_generator(max_num_cities=max_num_cities, seed=random_seed, grid_mode=False,
+ max_rails_between_cities=max_rails_between_cities,
+ max_rail_pairs_in_city=max_rails_in_city)
+
+ stochastic_data = MalfunctionParameters(malfunction_rate=malfunction_rate, # Rate of malfunction occurence
+ min_duration=malfunction_min_duration, # Minimal duration of malfunction
+ max_duration=malfunction_max_duration # Max duration of malfunction
+ )
+ speed_ratio_map = None
+ line_generator = sparse_line_generator(speed_ratio_map)
+
+ malfunction_generator = no_malfunction_generator()
+
+ while width <= max_width and height <= max_height:
+ try:
+ env = RailEnv(width=width, height=height, rail_generator=rail_generator,
+ line_generator=line_generator, number_of_agents=nr_trains,
+ # malfunction_generator_and_process_data=malfunction_from_params(stochastic_data),
+ malfunction_generator_and_process_data=malfunction_generator,
+ obs_builder_object=observation_builder, remove_agents_at_target=False)
+
+ print("[{}] {}x{} {} cities {} trains, max {} rails between cities, max {} rails in cities. Malfunction rate {}, {} to {} steps.".format(
+ random_seed, width, height, max_num_cities, nr_trains, max_rails_between_cities,
+ max_rails_in_city, malfunction_rate, malfunction_min_duration, malfunction_max_duration
+ ))
+
+ return env
+ except ValueError as e:
+ logging.error(f"Error: {e}")
+ width += 5
+ height += 5
+ logging.info("Try again with larger env: (w,h):", width, height)
+ logging.error(f"Unable to generate env with seed={random_seed}, max_width={max_height}, max_height={max_height}")
+ return None
+
+
+def random_sparse_env_small(random_seed, observation_builder, max_width = 45, max_height = 45):
+ random.seed(random_seed)
+ size = random.randint(0, 5)
+ width = 20 + size * 5
+ height = 20 + size * 5
+ nr_cities = 2 + size // 2 + random.randint(0, 2)
+ nr_trains = min(nr_cities * 5, 5 + random.randint(0, 5)) # , 10 + random.randint(0, 10))
+ max_rails_between_cities = 2
+ max_rails_in_cities = 3 + random.randint(0, size)
+ malfunction_rate = 30 + random.randint(0, 100)
+ malfunction_min_duration = 3 + random.randint(0, 7)
+ malfunction_max_duration = 20 + random.randint(0, 80)
+
+ rail_generator = sparse_rail_generator(max_num_cities=nr_cities, seed=random_seed, grid_mode=False,
+ max_rails_between_cities=max_rails_between_cities,
+ max_rail_pairs_in_city=max_rails_in_cities)
+
+ stochastic_data = MalfunctionParameters(malfunction_rate=malfunction_rate, # Rate of malfunction occurence
+ min_duration=malfunction_min_duration, # Minimal duration of malfunction
+ max_duration=malfunction_max_duration # Max duration of malfunction
+ )
+
+ line_generator = sparse_line_generator({1.: 0.25, 1. / 2.: 0.25, 1. / 3.: 0.25, 1. / 4.: 0.25})
+
+ while width <= max_width and height <= max_height:
+ try:
+ env = RailEnv(width=width, height=height, rail_generator=rail_generator,
+ line_generator=line_generator, number_of_agents=nr_trains,
+ # malfunction_generator_and_process_data=malfunction_from_params(stochastic_data),
+ malfunction_generator=ParamMalfunctionGen(stochastic_data),
+ obs_builder_object=observation_builder, remove_agents_at_target=False)
+
+ print("[{}] {}x{} {} cities {} trains, max {} rails between cities, max {} rails in cities. Malfunction rate {}, {} to {} steps.".format(
+ random_seed, width, height, nr_cities, nr_trains, max_rails_between_cities,
+ max_rails_in_cities, malfunction_rate, malfunction_min_duration, malfunction_max_duration
+ ))
+
+ return env
+ except ValueError as e:
+ logging.error(f"Error: {e}")
+ width += 5
+ height += 5
+ logging.info("Try again with larger env: (w,h):", width, height)
+ logging.error(f"Unable to generate env with seed={random_seed}, max_width={max_height}, max_height={max_height}")
+ return None
+
+
+def sparse_env_small(random_seed, observation_builder):
+ width = 30 # With of map
+ height = 30 # Height of map
+ nr_trains = 2 # Number of trains that have an assigned task in the env
+ cities_in_map = 3 # Number of cities where agents can start or end
+ seed = 10 # Random seed
+ grid_distribution_of_cities = False # Type of city distribution, if False cities are randomly placed
+ max_rails_between_cities = 2 # Max number of tracks allowed between cities. This is number of entry point to a city
+ max_rail_in_cities = 6 # Max number of parallel tracks within a city, representing a realistic trainstation
+
+ rail_generator = sparse_rail_generator(max_num_cities=cities_in_map,
+ seed=seed,
+ grid_mode=grid_distribution_of_cities,
+ max_rails_between_cities=max_rails_between_cities,
+ max_rail_pairs_in_city=max_rail_in_cities,
+ )
+
+ # Different agent types (trains) with different speeds.
+ speed_ration_map = {1.: 0.25, # Fast passenger train
+ 1. / 2.: 0.25, # Fast freight train
+ 1. / 3.: 0.25, # Slow commuter train
+ 1. / 4.: 0.25} # Slow freight train
+
+ # We can now initiate the schedule generator with the given speed profiles
+
+ line_generator = sparse_rail_generator(speed_ration_map)
+
+ # We can furthermore pass stochastic data to the RailEnv constructor which will allow for stochastic malfunctions
+ # during an episode.
+
+ stochastic_data = MalfunctionParameters(malfunction_rate=1/10000, # Rate of malfunction occurence
+ min_duration=15, # Minimal duration of malfunction
+ max_duration=50 # Max duration of malfunction
+ )
+
+ rail_env = RailEnv(width=width,
+ height=height,
+ rail_generator=rail_generator,
+ line_generator=line_generator,
+ number_of_agents=nr_trains,
+ obs_builder_object=observation_builder,
+ # malfunction_generator_and_process_data=malfunction_from_params(stochastic_data),
+ malfunction_generator=ParamMalfunctionGen(stochastic_data),
+ remove_agents_at_target=True)
+
+ return rail_env
+
+def _after_step(self, observation, reward, done, info):
+ if not self.enabled: return done
+
+ if type(done)== dict:
+ _done_check = done['__all__']
+ else:
+ _done_check = done
+ if _done_check and self.env_semantics_autoreset:
+ # For envs with BlockingReset wrapping VNCEnv, this observation will be the first one of the new episode
+ self.reset_video_recorder()
+ self.episode_id += 1
+ self._flush()
+
+ # Record stats - Disabled as it causes error in multi-agent set up
+ # self.stats_recorder.after_step(observation, reward, done, info)
+ # Record video
+ self.video_recorder.capture_frame()
+
+ return done
+
+
+def perc_completion(env):
+ tasks_finished = 0
+ if hasattr(env, "agents_data"):
+ agent_data = env.agents_data
+ else:
+ agent_data = env.agents
+ for current_agent in agent_data:
+ if current_agent.status == RailAgentStatus.DONE:
+ tasks_finished += 1
+
+ return 100 * np.mean(tasks_finished / max(
+ 1, len(agent_data)))
\ No newline at end of file
diff --git a/flatland/contrib/wrappers/flatland_wrappers.py b/flatland/contrib/wrappers/flatland_wrappers.py
new file mode 100644
index 0000000000000000000000000000000000000000..972c7eaf073f66de15b4839a2eb3fa5bcd18a68a
--- /dev/null
+++ b/flatland/contrib/wrappers/flatland_wrappers.py
@@ -0,0 +1,412 @@
+import numpy as np
+import os
+import PIL
+import shutil
+# MICHEL: my own imports
+import unittest
+import typing
+from collections import defaultdict
+from typing import Dict, Any, Optional, Set, List, Tuple
+
+
+from flatland.envs.observations import TreeObsForRailEnv,GlobalObsForRailEnv
+from flatland.envs.predictions import ShortestPathPredictorForRailEnv
+from flatland.core.grid.grid4_utils import get_new_position
+
+# First of all we import the Flatland rail environment
+from flatland.utils.rendertools import RenderTool, AgentRenderVariant
+
+from flatland.envs.agent_utils import EnvAgent, RailAgentStatus
+from flatland.envs.rail_env import RailEnv, RailEnvActions
+
+
+def possible_actions_sorted_by_distance(env: RailEnv, handle: int):
+ agent = env.agents[handle]
+
+
+ if agent.status == RailAgentStatus.READY_TO_DEPART:
+ agent_virtual_position = agent.initial_position
+ elif agent.status == RailAgentStatus.ACTIVE:
+ agent_virtual_position = agent.position
+ elif agent.status == RailAgentStatus.DONE:
+ agent_virtual_position = agent.target
+ else:
+ print("no action possible!")
+ if agent.status == RailAgentStatus.DONE_REMOVED:
+ print(f"agent status: DONE_REMOVED for agent {agent.handle}")
+ print("to solve this problem, do not input actions for removed agents!")
+ return [(RailEnvActions.DO_NOTHING, 0)] * 2
+ print("agent status:")
+ print(RailAgentStatus(agent.status))
+ #return None
+ # NEW: if agent is at target, DO_NOTHING, and distance is zero.
+ # NEW: (needs to be tested...)
+ return [(RailEnvActions.DO_NOTHING, 0)] * 2
+
+ possible_transitions = env.rail.get_transitions(*agent_virtual_position, agent.direction)
+ print(f"possible transitions: {possible_transitions}")
+ distance_map = env.distance_map.get()[handle]
+ possible_steps = []
+ for movement in list(range(4)):
+ # MICHEL: TODO: discuss with author of this code how it works, and why it breaks down in my test!
+ # should be much better commented or structured to be readable!
+ if possible_transitions[movement]:
+ if movement == agent.direction:
+ action = RailEnvActions.MOVE_FORWARD
+ elif movement == (agent.direction + 1) % 4:
+ action = RailEnvActions.MOVE_RIGHT
+ elif movement == (agent.direction - 1) % 4:
+ action = RailEnvActions.MOVE_LEFT
+ else:
+ # MICHEL: prints for debugging
+ print(f"An error occured. movement is: {movement}, agent direction is: {agent.direction}")
+ if movement == (agent.direction + 2) % 4 or (movement == agent.direction - 2) % 4:
+ print("it seems that we are turning by 180 degrees. Turning in a dead end?")
+
+ # MICHEL: can this happen when we turn 180 degrees in a dead end?
+ # i.e. can we then have movement == agent.direction + 2 % 4 (resp. ... == - 2 % 4)?
+
+ # TRY OUT: ASSIGN MOVE_FORWARD HERE...
+ action = RailEnvActions.MOVE_FORWARD
+ print("Here we would have a ValueError...")
+ #raise ValueError("Wtf, debug this shit.")
+
+ distance = distance_map[get_new_position(agent_virtual_position, movement) + (movement,)]
+ possible_steps.append((action, distance))
+ possible_steps = sorted(possible_steps, key=lambda step: step[1])
+
+
+ # MICHEL: what is this doing?
+ # if there is only one path to target, this is both the shortest one and the second shortest path.
+ if len(possible_steps) == 1:
+ return possible_steps * 2
+ else:
+ return possible_steps
+
+
+class RailEnvWrapper:
+ def __init__(self, env:RailEnv):
+ self.env = env
+
+ assert self.env is not None
+ assert self.env.rail is not None, "Reset original environment first!"
+ assert self.env.agents is not None, "Reset original environment first!"
+ assert len(self.env.agents) > 0, "Reset original environment first!"
+
+ # rail can be seen as part of the interface to RailEnv.
+ # is used by several wrappers, to e.g. access rail.get_valid_transitions(...)
+ #self.rail = self.env.rail
+ # same for env.agents
+ # MICHEL: DOES THIS HERE CAUSE A PROBLEM with agent status not being updated?
+ #self.agents = self.env.agents
+ #assert self.env.agents == self.agents
+ #print(f"agents of RailEnvWrapper are: {self.agents}")
+ #self.width = self.rail.width
+ #self.height = self.rail.height
+
+
+ # TODO: maybe do this in a generic way, like "for each method of self.env, ..."
+ # maybe using dir(self.env) (gives list of names of members)
+
+ # MICHEL: this seems to be needed after each env.reset(..) call
+ # otherwise, these attribute names refer to the wrong object and are out of sync...
+ # probably due to the reassignment of new objects to these variables by RailEnv, and how Python treats that.
+
+ # simple example: a = [1,2,3] b=a. But then a=[0]. Now we still have b==[1,2,3].
+
+ # it's better tou use properties here!
+
+ # @property
+ # def number_of_agents(self):
+ # return self.env.number_of_agents
+
+ # @property
+ # def agents(self):
+ # return self.env.agents
+
+ # @property
+ # def _seed(self):
+ # return self.env._seed
+
+ # @property
+ # def obs_builder(self):
+ # return self.env.obs_builder
+
+ def __getattr__(self, name):
+ try:
+ return super().__getattr__(self,name)
+ except:
+ """Expose any other attributes of the underlying environment."""
+ return getattr(self.env, name)
+
+
+ @property
+ def rail(self):
+ return self.env.rail
+
+ @property
+ def width(self):
+ return self.env.width
+
+ @property
+ def height(self):
+ return self.env.height
+
+ @property
+ def agent_positions(self):
+ return self.env.agent_positions
+
+ def get_num_agents(self):
+ return self.env.get_num_agents()
+
+ def get_agent_handles(self):
+ return self.env.get_agent_handles()
+
+ def step(self, action_dict: Dict[int, RailEnvActions]):
+ #self.agents = self.env.agents
+ # ERROR. something is wrong with the references for self.agents...
+ #assert self.env.agents == self.agents
+ return self.env.step(action_dict)
+
+ def reset(self, **kwargs):
+ # MICHEL: I suspect that env.reset() does not simply change values of variables, but assigns new objects
+ # that might cause some attributes not be properly updated here, because of how Python treats assignments differently from modification..
+ #assert self.env.agents == self.agents
+ obs, info = self.env.reset(**kwargs)
+ #assert self.env.agents == self.agents, "after resetting internal env, self.agents names wrong object..."
+ #self.reset_attributes()
+ #print(f"calling RailEnvWrapper.reset()")
+ #print(f"obs: {obs}, info:{info}")
+ return obs, info
+
+
+class ShortestPathActionWrapper(RailEnvWrapper):
+
+ def __init__(self, env:RailEnv):
+ super().__init__(env)
+ #self.action_space = gym.spaces.Discrete(n=3) # 0:stop, 1:shortest path, 2:other direction
+
+ # MICHEL: we have to make sure that not agents with agent.status == DONE_REMOVED are in the action dict.
+ # otherwise, possible_actions_sorted_by_distance(self.env, agent_id)[action - 1][0] will crash.
+ def step(self, action_dict: Dict[int, RailEnvActions]) -> Tuple[Dict, Dict, Dict, Dict]:
+ ########## MICHEL: NEW (just for debugging) ########
+ for agent_id, action in action_dict.items():
+ agent = self.agents[agent_id]
+ # assert agent.status != RailAgentStatus.DONE_REMOVED # this comes with agent.position == None...
+ # assert agent.status != RailAgentStatus.DONE # not sure about this one...
+ print(f"agent: {agent} with status: {agent.status}")
+ ######################################################
+
+ # input: action dict with actions in [0, 1, 2].
+ transformed_action_dict = {}
+ for agent_id, action in action_dict.items():
+ if action == 0:
+ transformed_action_dict[agent_id] = action
+ else:
+ assert action in [1, 2]
+ # MICHEL: how exactly do the indices work here?
+ #transformed_action_dict[agent_id] = possible_actions_sorted_by_distance(self.rail_env, agent_id)[action - 1][0]
+ #print(f"possible actions sorted by distance(...) is: {possible_actions_sorted_by_distance(self.env, agent_id)}")
+ #assert agent.status != RailAgentStatus.DONE_REMOVED
+ # MICHEL: THIS LINE CRASHES WITH A "NoneType is not subscriptable" error...
+ assert possible_actions_sorted_by_distance(self.env, agent_id) is not None
+ assert possible_actions_sorted_by_distance(self.env, agent_id)[action - 1] is not None
+ transformed_action_dict[agent_id] = possible_actions_sorted_by_distance(self.env, agent_id)[action - 1][0]
+ obs, rewards, dones, info = self.env.step(transformed_action_dict)
+ return obs, rewards, dones, info
+
+ #def reset(self, random_seed: Optional[int] = None) -> Dict[int, Any]:
+ #return self.rail_env.reset(random_seed)
+
+ # MICHEL: should not be needed, as we inherit that from RailEnvWrapper...
+ #def reset(self, **kwargs) -> Tuple[Dict, Dict]:
+ # obs, info = self.env.reset(**kwargs)
+ # return obs, info
+
+
+def find_all_cells_where_agent_can_choose(env: RailEnv):
+ """
+ input: a RailEnv (or something which behaves similarly, e.g. a wrapped RailEnv),
+ WHICH HAS BEEN RESET ALREADY!
+ (o.w., we call env.rail, which is None before reset(), and crash.)
+ """
+ switches = []
+ switches_neighbors = []
+ directions = list(range(4))
+ for h in range(env.height):
+ for w in range(env.width):
+
+ # MICHEL: THIS SEEMS TO BE A BUG. WRONG ODER OF COORDINATES.
+ # will not show up in quadratic environments.
+ # should be pos = (h, w)
+ #pos = (w, h)
+
+ # MICHEL: changed this
+ pos = (h, w)
+
+ is_switch = False
+ # Check for switch: if there is more than one outgoing transition
+ for orientation in directions:
+ #print(f"env is: {env}")
+ #print(f"env.rail is: {env.rail}")
+ possible_transitions = env.rail.get_transitions(*pos, orientation)
+ num_transitions = np.count_nonzero(possible_transitions)
+ if num_transitions > 1:
+ switches.append(pos)
+ is_switch = True
+ break
+ if is_switch:
+ # Add all neighbouring rails, if pos is a switch
+ for orientation in directions:
+ possible_transitions = env.rail.get_transitions(*pos, orientation)
+ for movement in directions:
+ if possible_transitions[movement]:
+ switches_neighbors.append(get_new_position(pos, movement))
+
+ decision_cells = switches + switches_neighbors
+ return tuple(map(set, (switches, switches_neighbors, decision_cells)))
+
+
+class NoChoiceCellsSkipper:
+ def __init__(self, env:RailEnv, accumulate_skipped_rewards: bool, discounting: float) -> None:
+ self.env = env
+ self.switches = None
+ self.switches_neighbors = None
+ self.decision_cells = None
+ self.accumulate_skipped_rewards = accumulate_skipped_rewards
+ self.discounting = discounting
+ self.skipped_rewards = defaultdict(list)
+
+ # env.reset() can change the rail grid layout, so the switches, etc. will change! --> need to do this in reset() as well.
+ #self.switches, self.switches_neighbors, self.decision_cells = find_all_cells_where_agent_can_choose(self.env)
+
+ # compute and initialize value for switches, switches_neighbors, and decision_cells.
+ self.reset_cells()
+
+ # MICHEL: maybe these three methods should be part of RailEnv?
+ def on_decision_cell(self, agent: EnvAgent) -> bool:
+ """
+ print(f"agent {agent.handle} is on decision cell")
+ if agent.position is None:
+ print("because agent.position is None (has not been activated yet)")
+ if agent.position == agent.initial_position:
+ print("because agent is at initial position, activated but not departed")
+ if agent.position in self.decision_cells:
+ print("because agent.position is in self.decision_cells.")
+ """
+ return agent.position is None or agent.position == agent.initial_position or agent.position in self.decision_cells
+
+ def on_switch(self, agent: EnvAgent) -> bool:
+ return agent.position in self.switches
+
+ def next_to_switch(self, agent: EnvAgent) -> bool:
+ return agent.position in self.switches_neighbors
+
+ # MICHEL: maybe just call this step()...
+ def no_choice_skip_step(self, action_dict: Dict[int, RailEnvActions]) -> Tuple[Dict, Dict, Dict, Dict]:
+ o, r, d, i = {}, {}, {}, {}
+
+ # MICHEL: NEED TO INITIALIZE i["..."]
+ # as we will access i["..."][agent_id]
+ i["action_required"] = dict()
+ i["malfunction"] = dict()
+ i["speed"] = dict()
+ i["status"] = dict()
+
+ while len(o) == 0:
+ #print(f"len(o)==0. stepping the rail environment...")
+ obs, reward, done, info = self.env.step(action_dict)
+
+ for agent_id, agent_obs in obs.items():
+
+ ###### MICHEL: prints for debugging ###########
+ if not self.on_decision_cell(self.env.agents[agent_id]):
+ print(f"agent {agent_id} is NOT on a decision cell.")
+ #################################################
+
+
+ if done[agent_id] or self.on_decision_cell(self.env.agents[agent_id]):
+ ###### MICHEL: prints for debugging ######################
+ if done[agent_id]:
+ print(f"agent {agent_id} is done.")
+ #if self.on_decision_cell(self.env.agents[agent_id]):
+ #print(f"agent {agent_id} is on decision cell.")
+ #cell = self.env.agents[agent_id].position
+ #print(f"cell is: {cell}")
+ #print(f"the decision cells are: {self.decision_cells}")
+
+ ############################################################
+
+ o[agent_id] = agent_obs
+ r[agent_id] = reward[agent_id]
+ d[agent_id] = done[agent_id]
+
+ # MICHEL: HAVE TO MODIFY THIS HERE
+ # because we are not using StepOutputs, the return values of step() have a different structure.
+ #i[agent_id] = info[agent_id]
+ i["action_required"][agent_id] = info["action_required"][agent_id]
+ i["malfunction"][agent_id] = info["malfunction"][agent_id]
+ i["speed"][agent_id] = info["speed"][agent_id]
+ i["status"][agent_id] = info["status"][agent_id]
+
+ if self.accumulate_skipped_rewards:
+ discounted_skipped_reward = r[agent_id]
+ for skipped_reward in reversed(self.skipped_rewards[agent_id]):
+ discounted_skipped_reward = self.discounting * discounted_skipped_reward + skipped_reward
+ r[agent_id] = discounted_skipped_reward
+ self.skipped_rewards[agent_id] = []
+
+ elif self.accumulate_skipped_rewards:
+ self.skipped_rewards[agent_id].append(reward[agent_id])
+ # end of for-loop
+
+ d['__all__'] = done['__all__']
+ action_dict = {}
+ # end of while-loop
+
+ return o, r, d, i
+
+ # MICHEL: maybe just call this reset()...
+ def reset_cells(self) -> None:
+ self.switches, self.switches_neighbors, self.decision_cells = find_all_cells_where_agent_can_choose(self.env)
+
+
+# IMPORTANT: rail env should be reset() / initialized before put into this one!
+# IDEA: MAYBE EACH RAILENV INSTANCE SHOULD AUTOMATICALLY BE reset() / initialized upon creation!
+class SkipNoChoiceCellsWrapper(RailEnvWrapper):
+
+ # env can be a real RailEnv, or anything that shares the same interface
+ # e.g. obs, rewards, dones, info = env.step(action_dict) and obs, info = env.reset(), and so on.
+ def __init__(self, env:RailEnv, accumulate_skipped_rewards: bool, discounting: float) -> None:
+ super().__init__(env)
+ # save these so they can be inspected easier.
+ self.accumulate_skipped_rewards = accumulate_skipped_rewards
+ self.discounting = discounting
+ self.skipper = NoChoiceCellsSkipper(env=self.env, accumulate_skipped_rewards=self.accumulate_skipped_rewards, discounting=self.discounting)
+
+ self.skipper.reset_cells()
+
+ # TODO: this is clunky..
+ # for easier access / checking
+ self.switches = self.skipper.switches
+ self.switches_neighbors = self.skipper.switches_neighbors
+ self.decision_cells = self.skipper.decision_cells
+ self.skipped_rewards = self.skipper.skipped_rewards
+
+
+ # MICHEL: trying to isolate the core part and put it into a separate method.
+ def step(self, action_dict: Dict[int, RailEnvActions]) -> Tuple[Dict, Dict, Dict, Dict]:
+ obs, rewards, dones, info = self.skipper.no_choice_skip_step(action_dict=action_dict)
+ return obs, rewards, dones, info
+
+
+ # MICHEL: TODO: maybe add parameters like regenerate_rail, regenerate_schedule, etc.
+ # arguments from RailEnv.reset() are: self, regenerate_rail: bool = True, regenerate_schedule: bool = True, activate_agents: bool = False, random_seed: bool = None
+ # TODO: check the type of random_seed. Is it bool or int?
+ # MICHEL: changed return type from Dict[int, Any] to Tuple[Dict, Dict].
+ def reset(self, **kwargs) -> Tuple[Dict, Dict]:
+ obs, info = self.env.reset(**kwargs)
+ # resets decision cells, switches, etc. These can change with an env.reset(...)!
+ # needs to be done after env.reset().
+ self.skipper.reset_cells()
+ return obs, info
\ No newline at end of file
diff --git a/tests/test_pettingzoo_interface.py b/tests/test_pettingzoo_interface.py
new file mode 100644
index 0000000000000000000000000000000000000000..d2b2776f183dcb0ac2a04b4d2f4f0cc769070f68
--- /dev/null
+++ b/tests/test_pettingzoo_interface.py
@@ -0,0 +1,132 @@
+import numpy as np
+import os
+import PIL
+import shutil
+
+from flatland.contrib.interface import flatland_env
+from flatland.contrib.utils import env_generators
+
+from flatland.envs.observations import TreeObsForRailEnv
+from flatland.envs.predictions import ShortestPathPredictorForRailEnv
+
+
+# First of all we import the Flatland rail environment
+from flatland.utils.rendertools import RenderTool, AgentRenderVariant
+
+from flatland.contrib.wrappers.flatland_wrappers import SkipNoChoiceCellsWrapper
+from flatland.contrib.wrappers.flatland_wrappers import ShortestPathActionWrapper # noqa
+import pytest
+
+
+@pytest.mark.skip(reason="Only for testing pettingzoo interface and wrappers")
+def test_petting_zoo_interface_env():
+
+ # Custom observation builder without predictor
+ # observation_builder = GlobalObsForRailEnv()
+
+ # Custom observation builder with predictor
+ observation_builder = TreeObsForRailEnv(max_depth=2, predictor=ShortestPathPredictorForRailEnv(30))
+ seed = 11
+ save = True
+ np.random.seed(seed)
+ experiment_name = "flatland_pettingzoo"
+ total_episodes = 1
+
+ if save:
+ try:
+ if os.path.isdir(experiment_name):
+ shutil.rmtree(experiment_name)
+ os.mkdir(experiment_name)
+ except OSError as e:
+ print("Error: %s - %s." % (e.filename, e.strerror))
+
+ rail_env = env_generators.sparse_env_small(seed, observation_builder)
+ rail_env = env_generators.small_v0(seed, observation_builder)
+
+ rail_env.reset(random_seed=seed)
+
+ # For Shortest Path Action Wrapper, change action to 1
+ # rail_env = ShortestPathActionWrapper(rail_env)
+ rail_env = SkipNoChoiceCellsWrapper(rail_env, accumulate_skipped_rewards=False, discounting=0.0)
+
+ env_renderer = RenderTool(rail_env,
+ agent_render_variant=AgentRenderVariant.ONE_STEP_BEHIND,
+ show_debug=False,
+ screen_height=600, # Adjust these parameters to fit your resolution
+ screen_width=800) # Adjust these parameters to fit your resolution
+
+ dones = {}
+ dones['__all__'] = False
+
+ step = 0
+ ep_no = 0
+ frame_list = []
+ all_actions_env = []
+ all_actions_pettingzoo_env = []
+ # while not dones['__all__']:
+ while ep_no < total_episodes:
+ action_dict = {}
+ # Chose an action for each agent
+ for a in range(rail_env.get_num_agents()):
+ # action = env_generators.get_shortest_path_action(rail_env, a)
+ action = 2
+ all_actions_env.append(action)
+ action_dict.update({a: action})
+ step += 1
+ # Do the environment step
+
+ observations, rewards, dones, information = rail_env.step(action_dict)
+ image = env_renderer.render_env(show=False, show_observations=False, show_predictions=False,
+ return_image=True)
+ frame_list.append(PIL.Image.fromarray(image[:, :, :3]))
+
+ if dones['__all__']:
+ completion = env_generators.perc_completion(rail_env)
+ print("Final Agents Completed:", completion)
+ ep_no += 1
+ if save:
+ frame_list[0].save(f"{experiment_name}{os.sep}out_{ep_no}.gif", save_all=True,
+ append_images=frame_list[1:], duration=3, loop=0)
+ frame_list = []
+ env_renderer = RenderTool(rail_env,
+ agent_render_variant=AgentRenderVariant.ONE_STEP_BEHIND,
+ show_debug=False,
+ screen_height=600, # Adjust these parameters to fit your resolution
+ screen_width=800) # Adjust these parameters to fit your resolution
+ rail_env.reset(random_seed=seed+ep_no)
+
+
+# __sphinx_doc_begin__
+ env = flatland_env.env(environment=rail_env, use_renderer=True)
+ seed = 11
+ env.reset(random_seed=seed)
+ step = 0
+ ep_no = 0
+ frame_list = []
+ while ep_no < total_episodes:
+ for agent in env.agent_iter():
+ obs, reward, done, info = env.last()
+ # act = env_generators.get_shortest_path_action(env.environment, get_agent_handle(agent))
+ act = 2
+ all_actions_pettingzoo_env.append(act)
+ env.step(act)
+ frame_list.append(PIL.Image.fromarray(env.render(mode='rgb_array')))
+ step += 1
+# __sphinx_doc_end__
+ completion = env_generators.perc_completion(env)
+ print("Final Agents Completed:", completion)
+ ep_no += 1
+ if save:
+ frame_list[0].save(f"{experiment_name}{os.sep}pettyzoo_out_{ep_no}.gif", save_all=True,
+ append_images=frame_list[1:], duration=3, loop=0)
+ frame_list = []
+ env.close()
+ env.reset(random_seed=seed+ep_no)
+ min_len = min(len(all_actions_pettingzoo_env), len(all_actions_env))
+ assert all_actions_pettingzoo_env[:min_len] == all_actions_env[:min_len], "actions do not match"
+
+
+if __name__ == "__main__":
+ import pytest
+ import sys
+ sys.exit(pytest.main(["-sv", __file__]))