def __init__(self,
state_space,
action_space,
discount=0.98,
preprocessing_spec=None,
network_spec=None,
internal_states_space=None,
policy_spec=None,
value_function_spec=None,
exploration_spec=None,
execution_spec=None,
optimizer_spec=None,
value_function_optimizer_spec=None,
observe_spec=None,
update_spec=None,
summary_spec=None,
saver_spec=None,
auto_build=True,
name="agent"):
"""
Args:
state_space (Union[dict,Space]): Spec dict for the state Space or a direct Space object.
action_space (Union[dict,Space]): Spec dict for the action Space or a direct Space object.
preprocessing_spec (Optional[list,PreprocessorStack]): The spec list for the different necessary states
preprocessing steps or a PreprocessorStack object itself.
discount (float): The discount factor (gamma).
network_spec (Optional[list,NeuralNetwork]): Spec list for a NeuralNetwork Component or the NeuralNetwork
object itself.
internal_states_space (Optional[Union[dict,Space]]): Spec dict for the internal-states Space or a direct
Space object for the Space(s) of the internal (RNN) states.
policy_spec (Optional[dict]): An optional dict for further kwargs passing into the Policy c'tor.
value_function_spec (list): Neural network specification for baseline.
exploration_spec (Optional[dict]): The spec-dict to create the Exploration Component.
execution_spec (Optional[dict,Execution]): The spec-dict specifying execution settings.
optimizer_spec (Optional[dict,Optimizer]): The spec-dict to create the Optimizer for this Agent.
value_function_optimizer_spec (dict): Optimizer config for value function otpimizer. If None, the optimizer
spec for the policy is used (same learning rate and optimizer type).
observe_spec (Optional[dict]): Spec-dict to specify `Agent.observe()` settings.
update_spec (Optional[dict]): Spec-dict to specify `Agent.update()` settings.
summary_spec (Optional[dict]): Spec-dict to specify summary settings.
saver_spec (Optional[dict]): Spec-dict to specify saver settings.
auto_build (Optional[bool]): If True (default), immediately builds the graph using the agent's
graph builder. If false, users must separately call agent.build(). Useful for debugging or analyzing
components before building.
name (str): Some name for this Agent object.
"""
super(Agent, self).__init__()
self.name = name
self.auto_build = auto_build
self.graph_built = False
self.logger = logging.getLogger(__name__)
self.state_space = Space.from_spec(state_space).with_batch_rank(False)
self.flat_state_space = self.state_space.flatten() if isinstance(
self.state_space, ContainerSpace) else None
self.logger.info("Parsed state space definition: {}".format(
self.state_space))
self.action_space = Space.from_spec(action_space).with_batch_rank(
False)
self.flat_action_space = self.action_space.flatten() if isinstance(
self.action_space, ContainerSpace) else None
self.logger.info("Parsed action space definition: {}".format(
self.action_space))
self.discount = discount
self.build_options = {}
# The agent's root-Component.
self.root_component = Component(name=self.name, nesting_level=0)
# Define the input-Spaces:
# Tag the input-Space to `self.set_weights` as equal to whatever the variables-Space will be for
# the Agent's policy Component.
self.input_spaces = dict(states=self.state_space.with_batch_rank(), )
# Construct the Preprocessor.
self.preprocessor = PreprocessorStack.from_spec(preprocessing_spec)
self.preprocessed_state_space = self.preprocessor.get_preprocessed_space(
self.state_space)
self.preprocessing_required = preprocessing_spec is not None and len(
preprocessing_spec) > 0
if self.preprocessing_required:
self.logger.info("Preprocessing required.")
self.logger.info(
"Parsed preprocessed-state space definition: {}".format(
self.preprocessed_state_space))
else:
self.logger.info("No preprocessing required.")
# Construct the Policy network.
policy_spec = policy_spec or dict()
if "network_spec" not in policy_spec:
policy_spec["network_spec"] = network_spec
if "action_space" not in policy_spec:
policy_spec["action_space"] = self.action_space
self.policy_spec = policy_spec
# The behavioral policy of the algorithm. Also the one that gets updated.
self.policy = Policy.from_spec(self.policy_spec)
# Done by default.
self.policy.add_components(Synchronizable(), expose_apis="sync")
# Create non-shared baseline network.
self.value_function = None
if value_function_spec is not None:
self.value_function = ValueFunction(
network_spec=value_function_spec)
self.value_function.add_components(Synchronizable(),
expose_apis="sync")
self.vars_merger = ContainerMerger("policy",
"vf",
scope="variable-dict-merger")
self.vars_splitter = ContainerSplitter(
"policy", "vf", scope="variable-container-splitter")
else:
self.vars_merger = ContainerMerger("policy",
scope="variable-dict-merger")
self.vars_splitter = ContainerSplitter(
"policy", scope="variable-container-splitter")
self.internal_states_space = Space.from_spec(internal_states_space)
# An object implementing the loss function interface is only strictly needed
# if automatic device strategies like multi-gpu are enabled. This is because
# the device strategy needs to know the name of the loss function to infer the appropriate
# operations.
self.loss_function = None
self.exploration = Exploration.from_spec(exploration_spec)
self.execution_spec = parse_execution_spec(execution_spec)
# Python-side experience buffer for better performance (may be disabled).
self.default_env = "env_0"
def factory_(i):
if i < 2:
return []
return tuple([[] for _ in range(i)])
self.states_buffer = defaultdict(
list) # partial(fact_, len(self.flat_state_space)))
self.actions_buffer = defaultdict(
partial(factory_, len(self.flat_action_space or [])))
self.internals_buffer = defaultdict(list)
self.rewards_buffer = defaultdict(list)
self.next_states_buffer = defaultdict(
list) # partial(fact_, len(self.flat_state_space)))
self.terminals_buffer = defaultdict(list)
self.observe_spec = parse_observe_spec(observe_spec)
# Global time step counter.
self.timesteps = 0
# Create the Agent's optimizer based on optimizer_spec and execution strategy.
self.optimizer = None
if optimizer_spec is not None:
# Save spec in case agent needs to create more optimizers e.g. for baseline.
self.optimizer_spec = optimizer_spec
self.optimizer = Optimizer.from_spec(optimizer_spec)
self.value_function_optimizer = None
if self.value_function is not None:
if value_function_optimizer_spec is None:
vf_optimizer_spec = self.optimizer_spec
else:
vf_optimizer_spec = value_function_optimizer_spec
vf_optimizer_spec["scope"] = "value-function-optimizer"
self.value_function_optimizer = Optimizer.from_spec(
vf_optimizer_spec)
# Update-spec dict tells the Agent how to update (e.g. memory batch size).
self.update_spec = parse_update_spec(update_spec)
# Create our GraphBuilder and -Executor.
self.graph_builder = GraphBuilder(action_space=self.action_space,
summary_spec=summary_spec)
self.graph_executor = GraphExecutor.from_spec(
get_backend(),
graph_builder=self.graph_builder,
execution_spec=self.execution_spec,
saver_spec=saver_spec) # type: GraphExecutor
def __init__(
self,
state_space,
action_space,
discount=0.98,
preprocessing_spec=None,
network_spec=None,
internal_states_space=None,
action_adapter_spec=None,
exploration_spec=None,
execution_spec=None,
optimizer_spec=None,
observe_spec=None,
update_spec=None,
summary_spec=None,
saver_spec=None,
auto_build=True,
name="agent"
):
"""
Args:
state_space (Union[dict,Space]): Spec dict for the state Space or a direct Space object.
action_space (Union[dict,Space]): Spec dict for the action Space or a direct Space object.
preprocessing_spec (Optional[list,PreprocessorStack]): The spec list for the different necessary states
preprocessing steps or a PreprocessorStack object itself.
discount (float): The discount factor (gamma).
network_spec (Optional[list,NeuralNetwork]): Spec list for a NeuralNetwork Component or the NeuralNetwork
object itself.
internal_states_space (Optional[Union[dict,Space]]): Spec dict for the internal-states Space or a direct
Space object for the Space(s) of the internal (RNN) states.
action_adapter_spec (Optional[dict,ActionAdapter]): The spec-dict for the ActionAdapter Component or the
ActionAdapter object itself.
exploration_spec (Optional[dict]): The spec-dict to create the Exploration Component.
execution_spec (Optional[dict,Execution]): The spec-dict specifying execution settings.
optimizer_spec (Optional[dict,Optimizer]): The spec-dict to create the Optimizer for this Agent.
observe_spec (Optional[dict]): Spec-dict to specify `Agent.observe()` settings.
update_spec (Optional[dict]): Spec-dict to specify `Agent.update()` settings.
summary_spec (Optional[dict]): Spec-dict to specify summary settings.
saver_spec (Optional[dict]): Spec-dict to specify saver settings.
auto_build (Optional[bool]): If True (default), immediately builds the graph using the agent's
graph builder. If false, users must separately call agent.build(). Useful for debugging or analyzing
components before building.
name (str): Some name for this Agent object.
"""
super(Agent, self).__init__()
self.name = name
self.auto_build = auto_build
self.graph_built = False
self.logger = logging.getLogger(__name__)
self.state_space = Space.from_spec(state_space).with_batch_rank(False)
self.logger.info("Parsed state space definition: {}".format(self.state_space))
self.action_space = Space.from_spec(action_space).with_batch_rank(False)
self.logger.info("Parsed action space definition: {}".format(self.action_space))
self.discount = discount
# The agent's root-Component.
self.root_component = Component(name=self.name)
# Define the input-Spaces:
# Tag the input-Space to `self.set_policy_weights` as equal to whatever the variables-Space will be for
# the Agent's policy Component.
self.input_spaces = dict(
states=self.state_space.with_batch_rank(),
)
# Construct the Preprocessor.
self.preprocessor = PreprocessorStack.from_spec(preprocessing_spec)
self.preprocessed_state_space = self.preprocessor.get_preprocessed_space(self.state_space)
self.preprocessing_required = preprocessing_spec is not None and len(preprocessing_spec) > 1
if self.preprocessing_required:
self.logger.info("Preprocessing required.")
self.logger.info("Parsed preprocessed-state space definition: {}".format(self.preprocessed_state_space))
else:
self.logger.info("No preprocessing required.")
# Construct the Policy network.
self.neural_network = None
if network_spec is not None:
self.neural_network = NeuralNetwork.from_spec(network_spec)
self.action_adapter_spec = action_adapter_spec
self.internal_states_space = internal_states_space
# An object implementing the loss function interface is only strictly needed
# if automatic device strategies like multi-gpu are enabled. This is because
# the device strategy needs to know the name of the loss function to infer the appropriate
# operations.
self.loss_function = None
# The action adapter mapping raw NN output to (shaped) actions.
action_adapter_dict = dict(action_space=self.action_space)
if self.action_adapter_spec is None:
self.action_adapter_spec = action_adapter_dict
else:
self.action_adapter_spec.update(action_adapter_dict)
# The behavioral policy of the algorithm. Also the one that gets updated.
self.policy = Policy(
network_spec=self.neural_network,
action_adapter_spec=self.action_adapter_spec
)
self.exploration = Exploration.from_spec(exploration_spec)
self.execution_spec = parse_execution_spec(execution_spec)
# Python-side experience buffer for better performance (may be disabled).
self.default_env = "env_0"
self.states_buffer = defaultdict(list)
self.actions_buffer = defaultdict(list)
self.internals_buffer = defaultdict(list)
self.rewards_buffer = defaultdict(list)
self.next_states_buffer = defaultdict(list)
self.terminals_buffer = defaultdict(list)
self.observe_spec = parse_observe_spec(observe_spec)
if self.observe_spec["buffer_enabled"]:
self.reset_env_buffers()
# Global time step counter.
self.timesteps = 0
# Create the Agent's optimizer based on optimizer_spec and execution strategy.
self.optimizer = None
if optimizer_spec is not None:
self.optimizer = Optimizer.from_spec(optimizer_spec) #get_optimizer_from_device_strategy(
#optimizer_spec, self.execution_spec.get("device_strategy", 'default')
# Update-spec dict tells the Agent how to update (e.g. memory batch size).
self.update_spec = parse_update_spec(update_spec)
# Create our GraphBuilder and -Executor.
self.graph_builder = GraphBuilder(action_space=self.action_space, summary_spec=summary_spec)
self.graph_executor = GraphExecutor.from_spec(
get_backend(),
graph_builder=self.graph_builder,
execution_spec=self.execution_spec,
saver_spec=saver_spec
) # type: GraphExecutor
