code: def test_invalid_target(self):
      with pytest.raises(
          ValueError,
          match="Input target of incorrect length 2 instead of 1",
      ):
          num_qubits = 1
  
          dev = qml.device("default.qubit", wires=num_qubits)
          observables = [qml.PauliZ(0)]
          loss = SquaredErrorLoss(rx_ansatz, observables, dev)
  
          phis = np.ones(num_qubits)
          loss(phis, target=np.array([1.0, 2.0]))
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane.qnn.cost import SquaredErrorLoss
label_desc: Use image node_id 2 for calling the TestSquaredErrorLossJax obj's underlying member method code with example usage: obj.test_invalid_target() without return types