Where do I find the following aqua components?

Question

from qiskit.aqua import QuantumInstance
from qiskit.aqua.components.optimizers import COBYLA
from qiskit.aqua.components.variational_forms import RY
from qiskit.aqua.algorithms import VQE

I am unable to implement it in my code and cannot figure out if the following libraries have been shifted to qiskit-terra or somewhere else?

Answer 1

The Qiskit Aqua support finished on December 2021 after being deprecated on April 2021.

For the objects you are referring in your post, currently (March 2024) the situation is:

• qiskit.aqua.QuantumInstance was replaced by primitives. See migration guide here
• qiskit.aqua.components.optimizers.COBYLA is now qiskit_algorithms.optimizers.COBYLA (docs)
• qiskit.aqua.components.variational_forms.RY has no direct replacement
• qiskit.aqua.algorithms.VQE is now in qiskit_algorithms.VQE (docs)

The alternative is to have an environment with old version of qiskit-aqua and its dependencies at April 2021 and a Python 3.8. Something like this:

qiskit-terra==0.18.0
qiskit-ignis==0.6.0
scipy==1.5
sympy==1.3
numpy==1.17
psutil==5
scikit-learn==0.20
dlx==1.0.4
docplex==2.21.207
fastdtw==0.3.4
setuptools==40.1.0
h5py==3.4
pandas==1.3
quandl==3.6
yfinance==0.1.62
retworkx==0.8.0