code: def create(input_shape):
      
      if isinstance(input_shape, numbers.Number):
          input_shape = (input_shape,)
      elif not isinstance(input_shape, tuple):
          input_shape = tuple(input_shape)
  
      def instantiate(**_):
          return NormalizeObservations(input_shape)
  
      return ModelFactory.generic(instantiate)
docs: Vel factory function