code: def copy(self):
      other = RunningStat()
      # TODO: Remove these safe-guards if not needed anymore.
      other.num_pushes = (
          self.num_pushes if hasattr(self, "num_pushes") else self._n
      )
      other.mean_array = (
          np.copy(self.mean_array)
          if hasattr(self, "mean_array")
          else np.copy(self._M)
      )
      other.std_array = (
          np.copy(self.std_array)
          if hasattr(self, "std_array")
          else np.copy(self._S)
      )
      return other
  
imports: import logging
  import threading
  import numpy
  import tree
  from ray.rllib.utils.annotations import DeveloperAPI
  from ray.rllib.utils.deprecation import Deprecated
  from ray.rllib.utils.numpy import SMALL_NUMBER
  from ray.rllib.utils.typing import TensorStructType
  from ray.rllib.utils.serialization import _serialize_ndarray, _deserialize_ndarray
  from ray.rllib.utils.deprecation import deprecation_warning
label_desc: Use image node_id 2 for calling the RunningStat obj's underlying member method code with example usage: obj.copy() and returns: other