class_docstr: Tests for the state function
class_docstr_tok: ["Tests","for","the","state","function"]
docstr: Test that the state correctly outputs in the torch interface
docstr_tok: ["Test","that","the","state","correctly","outputs","in","the","torch","interface"]
code: def test_interface_torch(self):
      """Test that the state correctly outputs in the torch interface"""
      import torch
  
      dev = qml.device("default.qubit.legacy", wires=4)
  
      @qml.qnode(dev, interface="torch")
      def func():
          for i in range(4):
              qml.Hadamard(i)
          return state()
  
      state_expected = 0.25 * torch.ones(16, dtype=torch.complex128)
      state_val = func()
  
      assert isinstance(state_val, torch.Tensor)
      assert state_val.dtype == torch.complex128
      assert torch.allclose(state_expected, state_val)
      assert state_val.shape == (16,)
  
imports: import numpy
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.devices import DefaultQubitLegacy
  from pennylane.measurements import State, Shots, density_matrix, expval, state
label_desc: Use image node_id 7 for calling the TestState obj's underlying member method code with example usage: obj.test_interface_torch() and returns: state