docs: def set_numeric_score_increment(self, increment):
          """Sets the numeric score increment.
  
          arg:    increment (decimal): the numeric score increment
          raise:  InvalidArgument - ``increment`` is invalid
          raise:  NoAccess - ``increment`` cannot be modified
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for osid.grading.GradeSystemForm.set_lowest_numeric_score
          if self.get_numeric_score_increment_metadata().is_read_only():
              raise errors.NoAccess()
          try:
              increment = float(increment)
          except ValueError:
              raise errors.InvalidArgument()
          if not self._is_valid_decimal(increment, self.get_numeric_score_increment_metadata()):
              raise errors.InvalidArgument()
          self._my_map['numericScoreIncrement'] = increment