code: def inverse(total: OutT) -> Tuple[OutT, Callable]:
      inv = 1.0 / (1 + total)
  
      def backward(d_inverse: OutT) -> OutT:
          return d_inverse * (-1 / (total + 1) ** 2)
  
      return inv, backward
  
file_path: thinc/thinc/layers/cauchysimilarity.py
imports: from typing import Callable, Optional, Tuple, cast
  from ..config import registry
  from ..model import Model
  from ..types import Floats1d, Floats2d
  from ..util import get_width
label_desc: Use image node_id 4 for calling a global function with example usage: inverse(total) and returns: inv,  backward, unknown