class_docstr: A connector that wraps around existing RLlib observation preprocessors.
  
  This includes:
  - OneHotPreprocessor for Discrete and Multi-Discrete spaces.
  - GenericPixelPreprocessor and AtariRamPreprocessor for Atari spaces.
  - TupleFlatteningPreprocessor and DictFlatteningPreprocessor for flattening
    arbitrary nested input observations.
  - RepeatedValuesPreprocessor for padding observations from RLlib Repeated
    observation space.
code: def to_state(self):
      return ObsPreprocessorConnector.__name__, None
  
file_path: ray/python/ray/rllib/connectors/agent/obs_preproc.py
imports: from typing import Any
  from ray.rllib.connectors.connector import AgentConnector, ConnectorContext
  from ray.rllib.connectors.registry import register_connector
  from ray.rllib.models.preprocessors import get_preprocessor, NoPreprocessor
  from ray.rllib.policy.sample_batch import SampleBatch
  from ray.rllib.utils.typing import AgentConnectorDataType
  from ray.util.annotations import PublicAPI
label_desc: Use image node_id 4 for calling the ObsPreprocessorConnector obj's underlying member method code with example usage: obj.to_state() and returns: ObsPreprocessorConnector,  None