class_docstr: Test ``qml.qjit`` with Catalyst's grad operations
class_docstr_tok: ["Test","``","qml.qjit","``","with","Catalyst","'s","grad","operations"]
docstr: Test the grad transformation with classical preprocessing and postprocessing.
docstr_tok: ["Test","the","grad","transformation","with","classical","preprocessing","and","postprocessing","."]
code: def test_grad_with_postprocessing(self):
      """Test the grad transformation with classical preprocessing and postprocessing."""
      dev = qml.device("lightning.qubit", wires=1)
  
      @qml.qjit
      def workflow(theta):
          @qml.qnode(dev, diff_method="adjoint")
          def circuit(theta):
              qml.RX(jnp.exp(theta**2) / jnp.cos(theta / 4), wires=0)
              return qml.expval(qml.PauliZ(wires=0))
  
          def loss(theta):
              return jnp.pi / jnp.tanh(circuit(theta))
  
          return qml.grad(loss, method="auto")(theta)
  
      assert jnp.allclose(workflow(1.0), 5.04324559)
  
imports: from unittest.mock import patch
  import pytest
  import pennylane
  from pennylane.compiler.compiler import CompileError
  from pennylane import numpy
  from jax import numpy
  from jax.core import ShapedArray
label_desc: Use image node_id 2 for calling the TestCatalystGrad obj's underlying member method code with example usage: obj.test_grad_with_postprocessing() and returns: qml, qml, unknown