class_docstr: Base semiring class.
  
  Based on description in:
  
  * Semiring parsing :cite:`goodman1999semiring`
docstr: Unconvert from semiring by removing extra first dimension.
docstr_tok: ["Unconvert","from","semiring","by","removing","extra","first","dimension","."]
code: def unconvert(cls, potentials):
      "Unconvert from semiring by removing extra first dimension."
      return potentials.squeeze(0)
  
imports: import torch
label_desc: Use image node_id 7 for calling the Semiring obj's underlying member method code with example usage: obj.unconvert(cls, potentials) and returns: potentials