简化代码；加入.venv下内容

tests/test_cpu_backend.py

@@ -9,6 +9,7 @@ from qibotn.benchmark_cases import (
     build_circuit as build_benchmark_circuit,
     exact_pauli_sum,
 )
+from qibotn import cpu_expectation, mps_expectation, pauli_pattern, pauli_sum
 
 
 def build_circuit(nqubits=6):
@@ -46,6 +47,37 @@ def test_cpu_generic_tn_expectation_matches_statevector():
     assert math.isclose(value, exact, abs_tol=1e-12)
 
 
+def test_public_cpu_expectation_api_matches_statevector():
+    circuit = build_circuit()
+    observable = pauli_sum((0.5, [("X", 0), ("Z", 1)]), (-0.25, [("Z", 5)]))
+    exact = exact_pauli_sum(
+        circuit,
+        [(0.5, (("X", 0), ("Z", 1))), (-0.25, (("Z", 5),))],
+        circuit.nqubits,
+    )
+
+    value = cpu_expectation(circuit, observable, torch_threads=1)
+
+    assert math.isclose(value, exact, abs_tol=1e-12)
+
+
+def test_public_mps_expectation_api_accepts_pauli_pattern():
+    circuit = build_circuit()
+    exact_hamiltonian = hamiltonians.SymbolicHamiltonian(
+        form=X(1) * Z(2) * X(4) * Z(5)
+    )
+    exact = exact_hamiltonian.expectation_from_state(circuit().state(numpy=True))
+
+    value = mps_expectation(
+        circuit,
+        pauli_pattern("IXZ"),
+        bond=64,
+        torch_threads=1,
+    )
+
+    assert math.isclose(value, exact, abs_tol=1e-12)
+
+
 def test_cpu_mps_expectation_matches_statevector():
     circuit = build_circuit()
     observable = build_observable(circuit.nqubits)