[minor] preliminary tests for inverse

Author: 01110011011101010110010001101111

test/module/inverse.py

@@ -0,0 +1,53 @@
+import torchquantum as tq
+from torchquantum.plugin import op_history2qiskit, qiskit2tq_op_history
+from torchquantum.measurement import expval_joint_analytical
+from qiskit import QuantumCircuit, Aer, execute
+from qiskit.quantum_info import Pauli
+import numpy as np
+
+"""
+Testing strategy:
+    partition on Operation: iterate through all the possible operations
+    partition on number of gates in module: 1, >1
+"""
+
+def compare(ops, n_wires):
+    # construct a normal tq circuit
+    qmod = tq.QuantumModule.from_op_history(ops)
+    qdev = tq.QuantumDevice(n_wires=n_wires, record_op=True)
+    qmod(qdev)
+
+    # turn into qiskit and inverse
+    qiskit_circuit = op_history2qiskit(n_wires, qdev.op_history)
+    qiskit_circuit = qiskit_circuit.inverse()
+
+    # inverse the tq circuit
+    qmod = tq.QuantumModule.from_op_history(ops)
+    qdev = tq.QuantumDevice(n_wires=n_wires, record_op=True)
+    qmod.inverse_module()
+    qmod(qdev)
+
+    qdev_ops = qiskit2tq_op_history(qiskit_circuit)
+
+    for tq_op, qiskit_op in zip(qdev.op_history, qdev_ops):
+        # TODO: name-wise (but currently need to ensure, e.g., cx == cnot)
+        if tq_op["params"] is not None and qiskit_op["params"] is not None:
+            assert np.allclose(np.array(tq_op["params"]), np.array(qiskit_op["params"]))
+
+def get_random_rotations(num_params):
+    return 4*np.pi*np.random.rand(num_params) - 2*np.pi
+
+def test_inverse():
+    ops = [
+        {'name': 'u3', 'wires': 0, 'trainable': True, 'params': get_random_rotations(3)},
+        {'name': 'u3', 'wires': 1, 'trainable': True, 'params': get_random_rotations(3)},
+        {'name': 'cx', 'wires': [0, 1]},
+        {'name': 'cx', 'wires': [1, 0]},
+        {'name': 'u3', 'wires': 0, 'trainable': True, 'params': get_random_rotations(3)},
+        {'name': 'u3', 'wires': 1, 'trainable': True, 'params': get_random_rotations(3)},
+        {'name': 'cx', 'wires': [0, 1]},
+        {'name': 'cx', 'wires': [1, 0]},
+    ]
+    compare(ops, 2)
+
+# test_inverse()