code: def circuit_4():
      """Circuit 4 with a Template"""
      qml.RandomLayers(
          weights=qml.math.array([[0.1, -2.1, 1.4]]), wires=range(2)
      )
      return qml.expval(qml.PauliZ(0))
  
imports: import math
  from functools import reduce
  import pytest
  import pennylane
  from pennylane.transforms.decompositions.clifford_t_transform import check_clifford_t, clifford_t_decomposition, _rot_decompose, _one_qubit_decompose, _two_qubit_decompose, _CLIFFORD_T_GATES
  from pennylane.transforms.optimization.optimization_utils import _fuse_global_phases
label_desc: Use image node_id 4 for calling a global function with example usage: circuit_4() and returns: qml