class_docstr: Implements the counting semiring (+, *, 0, 1).
docstr: Dot product along last dim
docstr_tok: ["Dot","product","along","last","dim"]
code: def matmul(cls, a, b):
      "Dot product along last dim"
  
      if has_genbmm and isinstance(a, genbmm.BandedMatrix):
          return b.multiply(a.transpose())
      else:
          return torch.matmul(a, b)
  
imports: import torch
label_desc: Use image node_id 2 for calling the StdSemiring obj's underlying member method code with example usage: obj.matmul(cls, a, b) and returns: b, torch