code: def circuit_1():
      """Simple circuit."""
      qml.Hadamard(wires=[0])
      qml.Hadamard(wires=[1])
  
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 1 for calling a global function with example usage: circuit_1() without return types