class_docstr: Converts a floating point observation into an unsigned int 8 bit observation. This is
  mostly useful for reducing memory consumption and is usually used for image observations. The filter will first
  spread the observation values over the range 0-255 and then discretize them into integer values.
code: def get_filtered_observation_space(
      self, input_observation_space: ObservationSpace
  ) -> ObservationSpace:
      input_observation_space.low = 0
      input_observation_space.high = 255
      return input_observation_space
  
file_path: coach/rl_coach/filters/observation/observation_to_uint8_filter.py
imports: import numpy
  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 ObservationToUInt8Filter obj's underlying member method code with example usage: obj.get_filtered_observation_space(input_observation_space) and returns: input_observation_space