code: def circuit_fixture(ops, obs):
      """A fixture of a circuit generated based on the ops and obs fixtures above."""
      return CircuitGraph(ops, obs, Wires([0, 1, 2]))
  
imports: import io
  import contextlib
  import numpy
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.resource import ResourcesOperation, Resources
  from pennylane.circuit_graph import CircuitGraph
  from pennylane.wires import Wires
label_desc: Use image node_id 3 for calling a global function with example usage: circuit_fixture(ops, obs) and returns: CircuitGraph