wehub-resource-sync
70 lines
2.5 KiB
Python
70 lines
2.5 KiB
Python
from typing import Any
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from ray.rllib.connectors.connector import (
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AgentConnector,
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ConnectorContext,
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)
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from ray.rllib.connectors.registry import register_connector
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from ray.rllib.models.preprocessors import NoPreprocessor, get_preprocessor
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from ray.rllib.policy.sample_batch import SampleBatch
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from ray.rllib.utils.annotations import OldAPIStack
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from ray.rllib.utils.typing import AgentConnectorDataType
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@OldAPIStack
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class ObsPreprocessorConnector(AgentConnector):
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"""A connector that wraps around existing RLlib observation preprocessors.
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This includes:
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- OneHotPreprocessor for Discrete and Multi-Discrete spaces.
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- GenericPixelPreprocessor and AtariRamPreprocessor for Atari spaces.
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- TupleFlatteningPreprocessor and DictFlatteningPreprocessor for flattening
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arbitrary nested input observations.
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- RepeatedValuesPreprocessor for padding observations from RLlib Repeated
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observation space.
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"""
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def __init__(self, ctx: ConnectorContext):
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super().__init__(ctx)
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if hasattr(ctx.observation_space, "original_space"):
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# ctx.observation_space is the space this Policy deals with.
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# We need to preprocess data from the original observation space here.
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obs_space = ctx.observation_space.original_space
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else:
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obs_space = ctx.observation_space
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self._preprocessor = get_preprocessor(obs_space)(
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obs_space, ctx.config.get("model", {})
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)
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def is_identity(self):
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"""Returns whether this preprocessor connector is a no-op preprocessor."""
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return isinstance(self._preprocessor, NoPreprocessor)
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def transform(self, ac_data: AgentConnectorDataType) -> AgentConnectorDataType:
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d = ac_data.data
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assert type(d) is dict, (
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"Single agent data must be of type Dict[str, TensorStructType] but is of "
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"type {}".format(type(d))
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)
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if SampleBatch.OBS in d:
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d[SampleBatch.OBS] = self._preprocessor.transform(d[SampleBatch.OBS])
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if SampleBatch.NEXT_OBS in d:
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d[SampleBatch.NEXT_OBS] = self._preprocessor.transform(
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d[SampleBatch.NEXT_OBS]
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)
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return ac_data
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def to_state(self):
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return ObsPreprocessorConnector.__name__, None
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@staticmethod
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def from_state(ctx: ConnectorContext, params: Any):
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return ObsPreprocessorConnector(ctx)
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register_connector(ObsPreprocessorConnector.__name__, ObsPreprocessorConnector)
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