code: def _compute_delta(num_levels: int) -> float:
      """Computes the delta value from number of levels
  
      Parameters
      ---------
      num_levels : int
          The number of levels
  
      Returns
      -------
      float
      """
      return num_levels / (2.0 * (num_levels - 1))
  
file_path: SALib/src/SALib/util/__init__.py
imports: from collections import OrderedDict
  from typing import Dict, Tuple
  import warnings
  import numpy
  import scipy
  from typing import List
  from .util_funcs import avail_approaches, read_param_file, _check_bounds, _check_groups
  from .problem import ProblemSpec
  from .results import ResultDict
label_desc: Use image node_id 8 for calling a global function with example usage: _compute_delta(num_levels) and returns: unknown