code: def get_op(qualname):
      def error_not_found():
          raise ValueError(
              f"Could not find the operator {qualname}. Please make sure you have "
              f"already registered the operator and (if registered from C++) "
              f"loaded it via torch.ops.load_library."
          )
  
      ns, name = parse_qualname(qualname)
      if not hasattr(torch.ops, ns):
          error_not_found()
      opnamespace = getattr(torch.ops, ns)
      if not hasattr(opnamespace, name):
          error_not_found()
      packet = getattr(opnamespace, name)
      if not hasattr(packet, "default"):
          error_not_found()
      return packet.default
  
imports: import dataclasses
  import functools
  import inspect
  import sys
  import typing
  import weakref
  from torchgen.model import FunctionSchema, OperatorName, SchemaKind, BaseType, ListType, BaseTy
  import torch
  import torch._C
  import torch.library
  from torch._library.abstract_impl import AbstractImplCtx
  from torch.library import get_ctx
  from .autograd import autograd_kernel_indirection, construct_autograd_kernel
label_desc: Use image node_id 16 for calling a global function with example usage: get_op(qualname) and returns: packet