add forgot import statement
@@ -31,7 +31,7 @@ from qiskit import execute as q_execute
from qiskit.tools.qi.pauli import Pauli, label_to_pauli, sgn_prod
from qiskit.qasm import pi
-from qiskit_aqua import AlgorithmError
+from qiskit_aqua import AlgorithmError, QuantumAlgorithm
from qiskit_aqua.utils import PauliGraph, summarize_circuits
logger = logging.getLogger(__name__)
