class_docstr: Serializer for gym.spaces.Discrete.
  
  Assumes that the size of the space fits in the number of symbols.
class_docstr_tok: ["Serializer","for","gym.spaces.Discrete",".","Assumes","that","the","size","of","the","space","fits","in","the","number","of","symbols","."]
code: def significance_map(self):
      return np.zeros(1, dtype=np.int32)
  
imports: import copy
  from absl import logging
  import gin
  import gym
  from jax import numpy
label_desc: Use image node_id 4 for calling the DiscreteSpaceSerializer obj's underlying member method code with example usage: obj.significance_map() and returns: np