def initialize(self, params, qubits):
    """Apply initialize to circuit."""
    if isinstance(qubits, QuantumRegister):
        qubits = qubits[:]
    else:
        qubits = _convert_to_bits([qubits], [qbit for qreg in self.qregs for qbit in qreg])[0]
    return self.append(Initialize(params), qubits)
Apply initialize to circuit.