There is no replace() method, but you can do the trick by means of pop() and insert().
from qiskit import QuantumCircuit, Aer, execute
from qiskit.extensions.standard import XGate
simulator = Aer.get_backend("qasm_simulator")
qc = QuantumCircuit(4,4)
result = execute(qc, backend=...
John Preskill identified the bottleneck you described as a fundamental problem in quantum deep learning (section 6.5, here). In particular,
But typical proposals for quantum machine learning applications are
confounded by severe input/output bottlenecks. For applications to
large classical data sets one should take into account the cost of