class_docstr: A Gaussian action noise
  
  :param mean: (float) the mean value of the noise
  :param sigma: (float) the scale of the noise (std here)
class_docstr_tok: ["A","Gaussian","action","noise",":","param","mean",":","(","float",")","the","mean","value","of","the","noise",":","param","sigma",":","(","float",")","the","scale","of","the","noise","(","std","here",")"]
code: def __call__(self) -> np.ndarray:
      return np.random.normal(self._mu, self._sigma)
  
imports: from abc import ABC, abstractmethod
  import numpy
label_desc: Use image node_id 2 for calling the NormalActionNoise obj's underlying member method code with example usage: obj.__call__() and returns: np