ImportError: cannot import name 'Estimator' from 'qiskit.primitives'

[eburnette]

Describe the bug
Import fails with an error.

pip.txt

To Reproduce
Check out the repo
Copy the example below (testit.py)
Run: pip install -e .
Run: python testit.py

from squlearn import Executor
from squlearn.encoding_circuit import (HighDimEncodingCircuit)
from squlearn.kernel import ProjectedQuantumKernel, QSVC

high_dim_ec = HighDimEncodingCircuit(
    num_qubits=4, num_features=3, num_layers=2)
pqk = ProjectedQuantumKernel(
    encoding_circuit=high_dim_ec,
    executor=Executor())
qsvc = QSVC(quantum_kernel=pqk)
print(qsvc)

Expected behavior
I expect the code to work without an error.

Additional context
I included pip.txt to show versions.
I did try it with earlier versions of qiskit but couldn't find one that didn't give some kind of import error.
For example with quiskit 1.4.2, I get:
ImportError: cannot import name 'Options' from 'qiskit_ibm_runtime.options'
on that first line.

pip.txt

[David-Kreplin]

Thank you very much for the report — we’ll fix this as soon as possible.
The issue is due to the recent release of Qiskit 2.0 and the associated update of qiskit-ibm-runtime.
Downgrading qiskit-ibm-runtime should resolve the issue for now, but we’ll update the requirements accordingly.

[MoritzWillmann]

Hey @eburnette,
thanks again for the report. This should've been fixed in #325 which has already been merged to the develop branch. Your example works for me if I install in a new python venv with the develop branch. We will release a new version of squlearn very soon. Until then you could try working with the develop branch. Let us know if you encounter any further issues.

Cheers Moritz