code: def circuit_3():
      """Three-qubit circuit."""
      qml.RY(0.5, wires=[0])
      qml.RY(0.6, wires=[1])
      qml.RY(0.7, wires=[2])
      qml.CNOT(wires=[0, 1])
      qml.CNOT(wires=[1, 2])
      qml.RX(-0.6, wires=[0])
      qml.RX(-0.3, wires=[1])
      qml.RX(-0.2, wires=[2])
  
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 3 for calling a global function with example usage: circuit_3() without return types