class_docstr: Bark frequency scale.
  
  Has wider bandwidths at lower frequencies, see:
  Critical bandwidth: BARK
  Zwicker and Terhardt, 1980
class_docstr_tok: ["Bark","frequency","scale",".","Has","wider","bandwidths","at","lower","frequencies",",","see",":","Critical","bandwidth",":","BARK","Zwicker","and","Terhardt",",","1980"]
docstr: Convert Bark to Hz.
docstr_tok: ["Convert","Bark","to","Hz","."]
code: def invert(x):
      """Convert Bark to Hz."""
      f = torch.div(x - 25.0, 75.0)
      f = torch.pow(f, (1.0 / 0.69))
      f = torch.div(f - 1.0, 1.4)
      f = torch.pow(f, 0.5)
      return f * 1000.0
  
imports: import math
  from typing import Union
  import torch
  from typeguard import check_argument_types
label_desc: Use image node_id 2 for calling the BarkScale obj's underlying member method code with example usage: obj.invert(x) and returns: unknown