def __init__(self, state_vector):
        """Constructor.

        Args:
            state_vector: vector representation of the desired quantum state
        """
        if not is_power_of_2(len(state_vector)):
            raise AquaError('The length of the input state vector needs to be a power of 2.')
        self._num_qubits = log2(len(state_vector))
        self._state_vector = normalize_vector(state_vector)
    def __init__(self, state_vector):
        """Constructor.

        Args:
            state_vector (numpy.ndarray): vector representation of the desired quantum state
        Raises:
            AquaError: invalid input
        """
        warnings.warn('The StateVectorCircuit class is deprecated as of Qiskit Aqua 0.9.0 and will '
                      'be removed no earlier than 3 months after the release. If you need to '
                      'initialize a circuit, use the QuantumCircuit.initialize or '
                      'QuantumCircuit.isometry methods. For a parameterized initialization, try '
                      'the qiskit.ml.circuit.library.RawFeatureVector class.',
                      DeprecationWarning, stacklevel=2)

        if not is_power_of_2(len(state_vector)):
            raise AquaError('The length of the input state vector needs to be a power of 2.')
        self._num_qubits = log2(len(state_vector))
        self._state_vector = normalize_vector(state_vector)