code: def circuit_2():
      """Simply parameterized circuit."""
      qml.RX(0.1, wires=[0])
      qml.RY(0.5, wires=[1])
      qml.CNOT(wires=[0, 1])
      qml.RY(0.6, wires=[0])
  
file_path: pennylane/tests/optimize/test_riemannian_gradient_optimizer.py
imports: import pytest
  from scipy.sparse.linalg import expm
  import numpy
  import pennylane
  from pennylane.optimize import RiemannianGradientOptimizer
label_desc: Use image node_id 2 for calling a global function with example usage: circuit_2() without return types