def test_reset_returns_same_obj_and_goal():
benchmark = metaworld.MT50()
env_dict = benchmark.train_classes
tasks = benchmark.train_tasks
initial_obj_poses = {name: [] for name in env_dict.keys()}
goal_poses = {name: [] for name in env_dict.keys()}
# Execute rollout for each environment in benchmark.
for env_name, env_cls in env_dict.items():
# Create environment and set task.
env = env_cls()
env_tasks = [t for t in tasks if t.env_name == env_name]
env.set_task(random.choice(env_tasks))
# Step through environment for a fixed number of episodes.
for _ in range(2):
# Reset environment and extract initial object position.
obs = env.reset()
goal = obs[-3:]
goal_poses[env_name].append(goal)
initial_obj_pos = obs[3:9]
initial_obj_poses[env_name].append(initial_obj_pos)
# Display initial object positions and find environments with non-unique positions.
violating_envs_obs = []
for env_name, task_initial_pos in initial_obj_poses.items():
if len(np.unique(np.array(task_initial_pos), axis=0)) > 1:
violating_envs_obs.append(env_name)
violating_envs_goals = []
for env_name, target_pos in goal_poses.items():
if len(np.unique(np.array(target_pos), axis=0)) > 1:
violating_envs_goals.append(env_name)
assert not violating_envs_obs
assert not violating_envs_goals
def test_identical_environments():
def helper(env, env_2):
for i in range(len(env.train_tasks)):
rand_vec_1 = pickle.loads(env.train_tasks[i].data)['rand_vec']
rand_vec_2 = pickle.loads(env_2.train_tasks[i].data)['rand_vec']
np.testing.assert_equal(rand_vec_1, rand_vec_2)
def helper_neq(env, env_2):
for i in range(len(env.train_tasks)):
rand_vec_1 = pickle.loads(env.train_tasks[i].data)['rand_vec']
rand_vec_2 = pickle.loads(env_2.train_tasks[i].data)['rand_vec']
assert not (rand_vec_1 == rand_vec_2).all()
#testing MT1
mt1_1 = metaworld.MT1('sweep-into-v2', seed=10)
mt1_2 = metaworld.MT1('sweep-into-v2', seed=10)
helper(mt1_1, mt1_2)
#testing ML1
ml1_1 = metaworld.ML1('sweep-into-v2', seed=10)
ml1_2 = metaworld.ML1('sweep-into-v2', seed=10)
helper(ml1_1, ml1_2)
#testing MT10
mt10_1 = metaworld.MT10(seed=10)
mt10_2 = metaworld.MT10(seed=10)
helper(mt10_1, mt10_2)
# testing ML10
ml10_1 = metaworld.ML10(seed=10)
ml10_2 = metaworld.ML10(seed=10)
helper(ml10_1, ml10_2)
#testing ML45
ml45_1 = metaworld.ML45(seed=10)
ml45_2 = metaworld.ML45(seed=10)
helper(ml45_1, ml45_2)
#testing MT50
mt50_1 = metaworld.MT50(seed=10)
mt50_2 = metaworld.MT50(seed=10)
helper(mt50_1, mt50_2)
# test that 2 benchmarks with different seeds have different goals
mt50_3 = metaworld.MT50(seed=50)
helper_neq(mt50_1, mt50_3)
def __init__(
self,
experiment_name,
use_gpu,
trainer_args
):
"""Train MTSAC with metaworld_experiments environment.
Args:
experiment_name: expeirment name to be used for logging and checkpointing
use_wandb: boolean, defines whether or not to log to wandb
use_gpu: boolean, defines whether or not to use to GPU for training
trainer_args: named tuple with args given by config
"""
# Define log and checkpoint dir
self.checkpoint_dir = os.path.join(
trainer_args.log_dir,
f"{experiment_name}-{trainer_args.project_id}"
)
print(f"Checkpoint dir: {self.checkpoint_dir}")
self.state_path = os.path.join(self.checkpoint_dir, "experiment_state.p")
self.env_state_path = os.path.join(self.checkpoint_dir, "env_state.p")
self.config_path = os.path.join(self.checkpoint_dir, "config.json")
self.experiment_name = experiment_name
# Only define viz_save_path if required to save visualizations local
self.viz_save_path = None
if trainer_args.save_visualizations_local:
self.viz_save_path = os.path.join(self.checkpoint_dir, "viz")
# Check if loading from existing experiment
self.loading_from_existing = os.path.exists(self.checkpoint_dir)
os.makedirs(self.checkpoint_dir, exist_ok=True)
# Save arguments for later retrieval
self.init_config(trainer_args)
num_tasks = trainer_args.num_tasks
# TODO: do we have to fix which GPU to use? run distributed across multiGPUs
if use_gpu:
set_gpu_mode(True, 0)
if trainer_args.seed is not None:
deterministic.set_seed(trainer_args.seed)
# Note: different classes whether it uses 10 or 50 tasks. Why?
mt_env = (
metaworld.MT10(seed=trainer_args.env_seed) if num_tasks <= 10
else metaworld.MT50(seed=trainer_args.env_seed)
)
train_task_sampler = MetaWorldTaskSampler(
mt_env, "train", add_env_onehot=True
)
# TODO: add some clarifying comments of why these asserts are required
assert num_tasks % 10 == 0, "Number of tasks have to divisible by 10"
assert num_tasks <= 500, "Number of tasks should be less or equal 500"
# TODO: do we have guarantees that in case seed is set, the tasks being sampled
# are the same?
mt_train_envs = train_task_sampler.sample(num_tasks)
env = mt_train_envs[0]()
if trainer_args.params_seed is not None:
torch.manual_seed(trainer_args.params_seed)
policy = create_policy_net(env_spec=env.spec, net_params=trainer_args)
qf1 = create_qf_net(env_spec=env.spec, net_params=trainer_args)
qf2 = create_qf_net(env_spec=env.spec, net_params=trainer_args)
if trainer_args.params_seed is not None:
calculate_mean_param("policy", policy)
calculate_mean_param("qf1", qf1)
calculate_mean_param("qf2", qf2)
if trainer_args.override_weight_initialization:
logging.warn("Overriding dendritic layer weight initialization")
self.override_weight_initialization([policy, qf1, qf2])
replay_buffer = PathBuffer(
capacity_in_transitions=trainer_args.num_buffer_transitions
)
max_episode_length = env.spec.max_episode_length
self.env_steps_per_epoch = int(max_episode_length * num_tasks)
self.num_epochs = trainer_args.timesteps // self.env_steps_per_epoch
sampler = RaySampler(
agent=policy,
envs=mt_train_envs,
max_episode_length=max_episode_length,
cpus_per_worker=trainer_args.cpus_per_worker,
gpus_per_worker=trainer_args.gpus_per_worker,
workers_per_env=trainer_args.workers_per_env,
seed=trainer_args.seed,
)
self._algo = CustomMTSAC(
env_spec=env.spec,
policy=policy,
qf1=qf1,
qf2=qf2,
replay_buffer=replay_buffer,
sampler=sampler,
train_task_sampler=train_task_sampler,
gradient_steps_per_itr=int(
max_episode_length * trainer_args.num_grad_steps_scale
),
task_update_frequency=trainer_args.task_update_frequency,
num_tasks=num_tasks,
min_buffer_size=max_episode_length * num_tasks,
target_update_tau=trainer_args.target_update_tau,
discount=trainer_args.discount,
buffer_batch_size=trainer_args.buffer_batch_size,
policy_lr=trainer_args.policy_lr,
qf_lr=trainer_args.qf_lr,
reward_scale=trainer_args.reward_scale,
num_evaluation_episodes=trainer_args.eval_episodes,
fp16=trainer_args.fp16 if use_gpu else False,
log_per_task=trainer_args.log_per_task,
share_train_eval_env=trainer_args.share_train_eval_env
)
# Override with loaded networks if existing experiment
self.current_epoch = 0
if self.loading_from_existing:
self.load_experiment_state()
# Move all networks within the model on device
self._algo.to()
def te_ppo_mt50(ctxt, seed, n_epochs, batch_size_per_task, n_tasks):
"""Train Task Embedding PPO with PointEnv.
Args:
ctxt (garage.experiment.ExperimentContext): The experiment
configuration used by Trainer to create the snapshotter.
seed (int): Used to seed the random number generator to produce
determinism.
n_epochs (int): Total number of epochs for training.
batch_size_per_task (int): Batch size of samples for each task.
n_tasks (int): Number of tasks to use. Should be a multiple of 50.
"""
set_seed(seed)
mt50 = metaworld.MT50()
task_sampler = MetaWorldTaskSampler(mt50,
'train',
lambda env, _: normalize(env),
add_env_onehot=False)
assert n_tasks % 50 == 0
assert n_tasks <= 2500
envs = [env_up() for env_up in task_sampler.sample(n_tasks)]
env = MultiEnvWrapper(envs,
sample_strategy=round_robin_strategy,
mode='vanilla')
latent_length = 6
inference_window = 6
batch_size = batch_size_per_task * n_tasks
policy_ent_coeff = 2e-2
encoder_ent_coeff = 2e-4
inference_ce_coeff = 5e-2
embedding_init_std = 0.1
embedding_max_std = 0.2
embedding_min_std = 1e-6
policy_init_std = 1.0
policy_max_std = None
policy_min_std = None
with TFTrainer(snapshot_config=ctxt) as trainer:
task_embed_spec = TEPPO.get_encoder_spec(env.task_space,
latent_dim=latent_length)
task_encoder = GaussianMLPEncoder(
name='embedding',
embedding_spec=task_embed_spec,
hidden_sizes=(20, 20),
std_share_network=True,
init_std=embedding_init_std,
max_std=embedding_max_std,
output_nonlinearity=tf.nn.tanh,
min_std=embedding_min_std,
)
traj_embed_spec = TEPPO.get_infer_spec(
env.spec,
latent_dim=latent_length,
inference_window_size=inference_window)
inference = GaussianMLPEncoder(
name='inference',
embedding_spec=traj_embed_spec,
hidden_sizes=(20, 10),
std_share_network=True,
init_std=2.0,
output_nonlinearity=tf.nn.tanh,
min_std=embedding_min_std,
)
policy = GaussianMLPTaskEmbeddingPolicy(
name='policy',
env_spec=env.spec,
encoder=task_encoder,
hidden_sizes=(32, 16),
std_share_network=True,
max_std=policy_max_std,
init_std=policy_init_std,
min_std=policy_min_std,
)
baseline = LinearMultiFeatureBaseline(
env_spec=env.spec, features=['observations', 'tasks', 'latents'])
algo = TEPPO(env_spec=env.spec,
policy=policy,
baseline=baseline,
inference=inference,
discount=0.99,
lr_clip_range=0.2,
policy_ent_coeff=policy_ent_coeff,
encoder_ent_coeff=encoder_ent_coeff,
inference_ce_coeff=inference_ce_coeff,
use_softplus_entropy=True,
optimizer_args=dict(
batch_size=32,
max_optimization_epochs=10,
learning_rate=1e-3,
),
inference_optimizer_args=dict(
batch_size=32,
max_optimization_epochs=10,
),
center_adv=True,
stop_ce_gradient=True)
trainer.setup(algo,
env,
sampler_cls=LocalSampler,
sampler_args=None,
worker_class=TaskEmbeddingWorker)
trainer.train(n_epochs=n_epochs, batch_size=batch_size, plot=False)
def mtsac_metaworld_mt50(
ctxt=None, *, config_pth, seed, timesteps, use_wandb, wandb_project_name, gpu
):
"""Train MTSAC with MT50 environment.
Args:
ctxt (garage.experiment.ExperimentContext): The experiment
configuration used by Trainer to create the snapshotter.
seed (int): Used to seed the random number generator to produce
determinism.
_gpu (int): The ID of the gpu to be used (used on multi-gpu machines).
num_tasks (int): Number of tasks to use. Should be a multiple of 10.
timesteps (int): Number of timesteps to run.
"""
"""Train MTSAC with metaworld_experiments environment.
Args:
ctxt (garage.experiment.ExperimentContext): The experiment
configuration used by Trainer to create the snapshotter.
seed (int): Used to seed the random number generator to produce
determinism.
_gpu (int): The ID of the gpu to be used (used on multi-gpu machines).
timesteps (int): Number of timesteps to run.
"""
print(f"Initiation took {time() - t0:.2f} secs")
# Get experiment parameters (e.g. hyperparameters) and save the json file
params = get_params(config_pth)
with open(ctxt.snapshot_dir + "/params.json", "w") as json_file:
json.dump(params, json_file)
if use_wandb == "True":
use_wandb = True
wandb.init(
name=params["experiment_name"],
project=wandb_project_name,
group="Baselines{}".format("mt50"),
reinit=True,
config=params,
)
else:
use_wandb = False
num_tasks = 50
timesteps = timesteps
deterministic.set_seed(seed)
trainer = CustomTrainer(ctxt)
mt10 = metaworld.MT50()
train_task_sampler = MetaWorldTaskSampler(mt10, "train", add_env_onehot=True)
assert num_tasks % 10 == 0, "Number of tasks have to divisible by 10"
assert num_tasks <= 500, "Number of tasks should be less or equal 500"
mt50_train_envs = train_task_sampler.sample(num_tasks)
env = mt50_train_envs[0]()
params["net"]["policy_min_std"] = np.exp(params["net"]["policy_min_log_std"])
params["net"]["policy_max_std"] = np.exp(params["net"]["policy_max_log_std"])
policy = create_policy_net(env_spec=env.spec, net_params=params["net"])
qf1 = create_qf_net(env_spec=env.spec, net_params=params["net"])
qf2 = create_qf_net(env_spec=env.spec, net_params=params["net"])
replay_buffer = PathBuffer(
capacity_in_transitions=int(params["general_setting"]["num_buffer_transitions"])
)
max_episode_length = env.spec.max_episode_length
# Note: are the episode length the same among all tasks?
sampler = RaySampler(
agents=policy,
envs=mt50_train_envs,
max_episode_length=max_episode_length,
# 1 sampler worker for each environment
n_workers=num_tasks,
worker_class=DefaultWorker
)
test_sampler = RaySampler(
agents=policy,
envs=mt50_train_envs,
max_episode_length=max_episode_length,
# 1 sampler worker for each environment
n_workers=num_tasks,
worker_class=EvalWorker
)
# Number of transitions before a set of gradient updates
steps_between_updates = int(max_episode_length * num_tasks)
# epoch: 1 cycle of data collection + gradient updates
epochs = timesteps // steps_between_updates
mtsac = CustomMTSAC(
env_spec=env.spec,
policy=policy,
qf1=qf1,
qf2=qf2,
replay_buffer=replay_buffer,
sampler=sampler,
train_task_sampler=train_task_sampler,
test_sampler=test_sampler,
gradient_steps_per_itr=int(max_episode_length * params["training"]["num_grad_steps_scale"]),
num_tasks=num_tasks,
min_buffer_size=max_episode_length * num_tasks,
target_update_tau=params["training"]["target_update_tau"],
discount=params["general_setting"]["discount"],
buffer_batch_size=params["training"]["buffer_batch_size"],
policy_lr=params["training"]["policy_lr"],
qf_lr=params["training"]["qf_lr"],
reward_scale=params["training"]["reward_scale"],
num_evaluation_episodes=params["general_setting"]["eval_episodes"],
task_update_frequency=params["training"]["task_update_frequency"],
wandb_logging=use_wandb,
evaluation_frequency=params["general_setting"]["evaluation_frequency"]
)
if gpu is not None:
set_gpu_mode(True, gpu)
mtsac.to()
trainer.setup(algo=mtsac, env=mt50_train_envs)
trainer.train(n_epochs=epochs, batch_size=steps_between_updates)
def mtsac_metaworld_mt50(ctxt=None,
*,
seed,
use_gpu,
_gpu,
n_tasks,
timesteps):
"""Train MTSAC with MT50 environment.
Args:
ctxt (garage.experiment.ExperimentContext): The experiment
configuration used by Trainer to create the snapshotter.
seed (int): Used to seed the random number generator to produce
determinism.
use_gpu (bool): Used to enable ussage of GPU in training.
_gpu (int): The ID of the gpu (used on multi-gpu machines).
n_tasks (int): Number of tasks to use. Should be a multiple of 50.
timesteps (int): Number of timesteps to run.
"""
deterministic.set_seed(seed)
trainer = Trainer(ctxt)
mt50 = metaworld.MT50() # pylint: disable=no-member
mt50_test = metaworld.MT50() # pylint: disable=no-member
train_task_sampler = MetaWorldTaskSampler(
mt50,
'train',
lambda env, _: normalize(env, normalize_reward=True),
add_env_onehot=True)
test_task_sampler = MetaWorldTaskSampler(mt50_test,
'train',
lambda env, _: normalize(env),
add_env_onehot=True)
assert n_tasks % 50 == 0
assert n_tasks <= 2500
mt50_train_envs = train_task_sampler.sample(n_tasks)
env = mt50_train_envs[0]()
mt50_test_envs = [env_up() for env_up in test_task_sampler.sample(n_tasks)]
policy = TanhGaussianMLPPolicy(
env_spec=env.spec,
hidden_sizes=[400, 400, 400],
hidden_nonlinearity=nn.ReLU,
output_nonlinearity=None,
min_std=np.exp(-20.),
max_std=np.exp(2.),
)
qf1 = ContinuousMLPQFunction(env_spec=env.spec,
hidden_sizes=[400, 400, 400],
hidden_nonlinearity=F.relu)
qf2 = ContinuousMLPQFunction(env_spec=env.spec,
hidden_sizes=[400, 400, 400],
hidden_nonlinearity=F.relu)
replay_buffer = PathBuffer(capacity_in_transitions=int(1e6), )
sampler = LocalSampler(
agents=policy,
envs=mt50_train_envs,
max_episode_length=env.spec.max_episode_length,
# 1 sampler worker for each environment
n_workers=50,
worker_class=FragmentWorker,
# increasing n_envs increases the vectorization of a sampler worker
# which improves runtime performance, but you will need to adjust this
# depending on your memory constraints. For reference, each worker by
# default uses n_envs=8. Each environment is approximately ~50mb large
# so creating 50 envs with 8 copies comes out to 20gb of memory. Many
# users want to be able to run multiple seeds on 1 machine, so I have
# reduced this to n_envs = 2 for 2 copies in the meantime.
worker_args=dict(n_envs=2))
batch_size = int(env.spec.max_episode_length * n_tasks)
num_evaluation_points = 500
epochs = timesteps // batch_size
epoch_cycles = epochs // num_evaluation_points
epochs = epochs // epoch_cycles
mtsac = MTSAC(policy=policy,
qf1=qf1,
qf2=qf2,
sampler=sampler,
gradient_steps_per_itr=env.spec.max_episode_length,
eval_env=mt50_test_envs,
env_spec=env.spec,
num_tasks=50,
steps_per_epoch=epoch_cycles,
replay_buffer=replay_buffer,
min_buffer_size=7500,
target_update_tau=5e-3,
discount=0.99,
buffer_batch_size=6400)
set_gpu_mode(use_gpu, _gpu)
mtsac.to()
trainer.setup(algo=mtsac, env=mt50_train_envs)
trainer.train(n_epochs=epochs, batch_size=batch_size)
def __init__(
self,
benchmark_name: str,
save_memory: bool = False,
add_observability: bool = False,
) -> None:
""" Init function for environment wrapper. """
# We import here so that we avoid importing metaworld if possible, since it is
# dependent on mujoco.
import metaworld
from metaworld import Task
# Set config for each benchmark.
if benchmark_name.startswith("MT1_"):
env_name = benchmark_name[4:]
benchmark = metaworld.MT1(env_name)
env_dict = {env_name: benchmark.train_classes[env_name]}
tasks = benchmark.train_tasks
resample_tasks = False
self.augment_obs = False
elif benchmark_name == "MT10":
benchmark = metaworld.MT10()
env_dict = benchmark.train_classes
tasks = benchmark.train_tasks
resample_tasks = False
self.augment_obs = True
elif benchmark_name == "MT50":
benchmark = metaworld.MT50()
env_dict = benchmark.train_classes
tasks = benchmark.train_tasks
resample_tasks = False
self.augment_obs = True
elif benchmark_name.startswith("ML1_train_"):
env_name = benchmark_name[10:]
benchmark = metaworld.ML1(env_name)
env_dict = {env_name: benchmark.train_classes[env_name]}
tasks = benchmark.train_tasks
resample_tasks = True
self.augment_obs = False
elif benchmark_name == "ML10_train":
benchmark = metaworld.ML10()
env_dict = benchmark.train_classes
tasks = benchmark.train_tasks
resample_tasks = True
self.augment_obs = True
elif benchmark_name == "ML45_train":
benchmark = metaworld.ML45()
env_dict = benchmark.train_classes
tasks = benchmark.train_tasks
resample_tasks = True
self.augment_obs = True
elif benchmark_name.startswith("ML1_test_"):
env_name = benchmark_name[9:]
benchmark = metaworld.ML1(env_name)
env_dict = {env_name: benchmark.test_classes[env_name]}
tasks = benchmark.test_tasks
resample_tasks = True
self.augment_obs = False
elif benchmark_name == "ML10_test":
benchmark = metaworld.ML10()
env_dict = benchmark.test_classes
tasks = benchmark.test_tasks
resample_tasks = True
self.augment_obs = True
elif benchmark_name == "ML45_test":
benchmark = metaworld.ML45()
env_dict = benchmark.test_classes
tasks = benchmark.test_tasks
resample_tasks = True
self.augment_obs = True
else:
raise NotImplementedError
# Construct list of tasks for each environment, adding observability to tasks if
# necessary.
env_tasks = {}
for task in tasks:
if add_observability:
task_data = dict(pickle.loads(task.data))
task_data["partially_observable"] = False
task = Task(env_name=task.env_name,
data=pickle.dumps(task_data))
if task.env_name in env_tasks:
if resample_tasks:
env_tasks[task.env_name].append(task)
else:
env_tasks[task.env_name] = [task]
# Construct list of environment classes or class instances.
self.save_memory = save_memory
if self.save_memory:
self.envs_info = [{
"env_name": env_name,
"env_cls": env_cls,
"tasks": env_tasks[env_name]
} for (env_name, env_cls) in env_dict.items()]
else:
self.envs_info = [{
"env_name": env_name,
"env": env_cls(),
"tasks": env_tasks[env_name]
} for (env_name, env_cls) in env_dict.items()]
self.num_tasks = len(self.envs_info)
# Sample environment.
self._sample_environment()
def mtsac_metaworld_mt10(ctxt=None,
*,
experiment_name,
config_pth,
seed,
use_wandb,
gpu):
"""Train MTSAC with MT10 environment.
Args:
ctxt (garage.experiment.ExperimentContext): The experiment
configuration used by Trainer to create the snapshotter.
seed (int): Used to seed the random number generator to produce
determinism.
_gpu (int): The ID of the gpu to be used (used on multi-gpu machines).
timesteps (int): Number of timesteps to run.
"""
print(f"Initiation took {time()-t0:.2f} secs")
device = torch.device("cuda") if gpu else torch.device("cpu")
print(f"Using GPU: {gpu}, Device: {device}")
# maybe overring other things - this is required, why?
if gpu:
set_gpu_mode(True)
else:
set_gpu_mode(False)
# Get experiment parameters (e.g. hyperparameters) and save the json file
params = get_params(config_pth)
with open(ctxt.snapshot_dir + "/params.json", "w") as json_file:
json.dump(params, json_file)
if use_wandb == "True":
use_wandb = True
wandb.init(
name=experiment_name,
project="mt10_debug",
group="Baselines{}".format("mt10"),
reinit=True,
config=params,
)
else:
use_wandb = False
num_tasks = params["net"]["num_tasks"]
timesteps = 15000000
deterministic.set_seed(seed)
trainer = Trainer(ctxt)
# Note: different classes whether it uses 10 or 50 tasks. Why?
if num_tasks <= 10:
mt_env = metaworld.MT10()
else:
mt_env = metaworld.MT50()
train_task_sampler = MetaWorldTaskSampler(mt_env,
"train",
add_env_onehot=True)
assert num_tasks % 10 == 0, "Number of tasks have to divisible by 10"
assert num_tasks <= 500, "Number of tasks should be less or equal 500"
mt_train_envs = train_task_sampler.sample(num_tasks)
env = mt_train_envs[0]()
params["net"]["policy_min_std"] = np.exp(
params["net"]["policy_min_log_std"])
params["net"]["policy_max_std"] = np.exp(
params["net"]["policy_max_log_std"])
policy = create_policy_net(env_spec=env.spec, net_params=params["net"])
print("Created policy")
qf1 = create_qf_net(env_spec=env.spec, net_params=params["net"])
qf2 = create_qf_net(env_spec=env.spec, net_params=params["net"])
print("Created value functions")
replay_buffer = PathBuffer(capacity_in_transitions=int(
params["general_setting"]["num_buffer_transitions"]))
max_episode_length = env.spec.max_episode_length
# Note: are the episode length the same among all tasks?
sampler = RaySampler(
agents=policy,
envs=mt_train_envs,
max_episode_length=max_episode_length,
cpus_per_worker=params["sampler"]["cpus_per_worker"],
gpus_per_worker=params["sampler"]["gpus_per_worker"],
seed=None, # set to get_seed() to make it deterministic
)
# will probably still need the sampler
test_sampler = sampler
# test_sampler = RaySampler(
# agents=policy,
# envs=mt_train_envs,
# max_episode_length=max_episode_length,
# # 1 sampler worker for each environment
# n_workers=num_tasks,
# worker_class=EvalWorker
# )
# Note: difference between sampler and test sampler is only the worker
# difference is one line in EvalWorker, uses average: a = agent_info["mean"]
# can we create a unified worker that cointais both rules?
# Number of transitions before a set of gradient updates
# Note: should we use avg episode length, if they are not same for all tasks?
batch_size = int(max_episode_length * num_tasks)
# TODO: this whole block seems unnecessary, it is not doing anything.
# Number of times policy is evaluated (also the # of epochs)
num_evaluation_points = timesteps // batch_size
epochs = timesteps // batch_size
# number of times new batch of samples + gradient updates are done per epoch
epoch_cycles = epochs // num_evaluation_points # this will always be equal to 1
epochs = epochs // epoch_cycles
mtsac = CustomMTSAC(
env_spec=env.spec,
policy=policy,
qf1=qf1,
qf2=qf2,
replay_buffer=replay_buffer,
sampler=sampler,
train_task_sampler=train_task_sampler,
test_sampler=test_sampler,
gradient_steps_per_itr=1,
num_tasks=num_tasks,
steps_per_epoch=epoch_cycles,
min_buffer_size=max_episode_length * num_tasks,
target_update_tau=params["training"]["target_update_tau"],
discount=params["general_setting"]["discount"],
buffer_batch_size=params["training"]["buffer_batch_size"],
policy_lr=params["training"]["policy_lr"],
qf_lr=params["training"]["qf_lr"],
reward_scale=params["training"]["reward_scale"],
num_evaluation_episodes=params["general_setting"]["eval_episodes"],
task_update_frequency=params["training"]["task_update_frequency"],
wandb_logging=use_wandb,
evaluation_frequency=params["general_setting"]["evaluation_frequency"],
)
print("Created algo")
mtsac.to(device=device)
print("Moved networks to device")
trainer.setup(algo=mtsac, env=mt_train_envs)
print("Setup trainer")
trainer.train(n_epochs=epochs, batch_size=batch_size)