class_docstr: Rescales an image observation by some factor. For example, the image size
  can be reduced by a factor of 2.
code: def get_filtered_observation_space(
      self, input_observation_space: ObservationSpace
  ) -> ObservationSpace:
      input_observation_space.shape[:2] = (
          input_observation_space.shape[:2] * self.rescale_factor
      ).astype("int")
      return input_observation_space
  
file_path: coach/rl_coach/filters/observation/observation_rescale_size_by_factor_filter.py
imports: from skimage.transform import resize
  from rl_coach.core_types import ObservationType
  from rl_coach.filters.observation.observation_filter import ObservationFilter
  from rl_coach.spaces import ObservationSpace
label_desc: Use image node_id 4 for calling the ObservationRescaleSizeByFactorFilter obj's underlying member method code with example usage: obj.get_filtered_observation_space(input_observation_space) and returns: input_observation_space