code: def test_layer_circuit(self):
      num_qubits = 3
  
      dev = qml.device("default.qubit", wires=num_qubits)
      observables = [
          qml.PauliZ(0),
          qml.PauliX(0),
          qml.PauliZ(1) @ qml.PauliZ(2),
      ]
      loss = SquaredErrorLoss(layer_ansatz, observables, dev)
  
      weights = np.ones((num_qubits, 3, 3))
      res = loss(
          weights,
          x=np.array([1.0, 2.0, 1.0]),
          target=np.array([1.0, 0.5, 0.1]),
      )
  
      assert np.allclose(
          res, np.array([0.88, 0.83, 0.05]), atol=0.01, rtol=0.01
      )
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane.qnn.cost import SquaredErrorLoss
label_desc: Use image node_id 3 for calling the TestSquaredErrorLossJax obj's underlying member method code with example usage: obj.test_layer_circuit() without return types