code: def diag(tensor, k=0):
      return torch.diag(tensor, diagonal=k)
  
imports: from packaging.version import Version
  import numpy
  from .core import Backend, backend_types, backend_basic_math, backend_array
label_desc: Use image node_id 23 for calling the PyTorchBackend obj's underlying member method code with example usage: obj.diag(tensor, k) and returns: torch