conda - Import Error: cannot import name 'BaseEstimator' from 'qiskit.primitives' - Stack Overfl

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I'm working on a conda environment

This is the versions of my packages:

conda list qiskit
# packages in environment at /opt/anaconda3/envs/qnn:
#
# Name                    Version                   Build  Channel
qiskit                    2.0.0           py312hcd83bfe_0    conda-fe
qiskit-aer                0.17.0                   pypi_0    pypi
qiskit-ibm-runtime        0.37.0                   pypi_0    pypi
qiskit-machine-learning   0.8.2              pyhd8ed1ab_1    conda-fe

and when i try to import this:

import numpy as np
import pandas as pd
from qiskit import QuantumCircuit
from qiskit.circuit import Parameter
from qiskit.quantum_info import SparsePauliOp
from qiskit.primitives import StatevectorEstimator as Estimator
from qiskit_machine_learning.neural_networks import EstimatorQNN

I get this error in the last import:

ImportError:
----> 8 from qiskit_machine_learning.neural_networks import EstimatorQNN

[...]

File /opt/anaconda3/envs/qnn/lib/python3.12/site-packages/qiskit_machine_learning/neural_networks/effective_dimension.py:23
...
---> 24 from qiskit.primitives import BaseEstimator, BaseEstimatorV1, Estimator, EstimatorResult
     25 from qiskit.quantum_info import SparsePauliOp
     26 from qiskit.quantum_info.operators.base_operator import BaseOperator

ImportError: cannot import name 'BaseEstimator' from 'qiskit.primitives' (/opt/anaconda3/envs/qnn/lib/python3.12/site-packages/qiskit/primitives/__init__.py)

If i try to do this:

from qiskit.primitives import Estimator

I get

ImportError: cannot import name 'Estimator' from 'qiskit.primitives' (/opt/anaconda3/envs/qnn/lib/python3.12/site-packages/qiskit/primitives/__init__.py)

I know it's because qiskit 2.0.0 it's not compatible with qiskit-machine-learning 0.8.2.

So first, i tried to downgrade to qiskit 0.44.0, didn't resolve.

Then i tried update qiskit-machine-learning to 0.9.0 and couldn't because anaconda...

conda install -c conda-fe qiskit-machine-learning=0.9.0
Channels:
 - conda-fe
 - defaults
Platform: osx-arm64
Collecting package metadata (repodata.json): done
Solving environment: failed

PackagesNotFoundError: The following packages are not available from current channels:
  - qiskit-machine-learning=0.9.0*

Can anyone tell me how can i fix this?

I'm working on a conda environment

This is the versions of my packages:

conda list qiskit
# packages in environment at /opt/anaconda3/envs/qnn:
#
# Name                    Version                   Build  Channel
qiskit                    2.0.0           py312hcd83bfe_0    conda-fe
qiskit-aer                0.17.0                   pypi_0    pypi
qiskit-ibm-runtime        0.37.0                   pypi_0    pypi
qiskit-machine-learning   0.8.2              pyhd8ed1ab_1    conda-fe

and when i try to import this:

import numpy as np
import pandas as pd
from qiskit import QuantumCircuit
from qiskit.circuit import Parameter
from qiskit.quantum_info import SparsePauliOp
from qiskit.primitives import StatevectorEstimator as Estimator
from qiskit_machine_learning.neural_networks import EstimatorQNN

I get this error in the last import:

ImportError:
----> 8 from qiskit_machine_learning.neural_networks import EstimatorQNN

[...]

File /opt/anaconda3/envs/qnn/lib/python3.12/site-packages/qiskit_machine_learning/neural_networks/effective_dimension.py:23
...
---> 24 from qiskit.primitives import BaseEstimator, BaseEstimatorV1, Estimator, EstimatorResult
     25 from qiskit.quantum_info import SparsePauliOp
     26 from qiskit.quantum_info.operators.base_operator import BaseOperator

ImportError: cannot import name 'BaseEstimator' from 'qiskit.primitives' (/opt/anaconda3/envs/qnn/lib/python3.12/site-packages/qiskit/primitives/__init__.py)

If i try to do this:

from qiskit.primitives import Estimator

I get

ImportError: cannot import name 'Estimator' from 'qiskit.primitives' (/opt/anaconda3/envs/qnn/lib/python3.12/site-packages/qiskit/primitives/__init__.py)

I know it's because qiskit 2.0.0 it's not compatible with qiskit-machine-learning 0.8.2.

So first, i tried to downgrade to qiskit 0.44.0, didn't resolve.

Then i tried update qiskit-machine-learning to 0.9.0 and couldn't because anaconda...

conda install -c conda-fe qiskit-machine-learning=0.9.0
Channels:
 - conda-fe
 - defaults
Platform: osx-arm64
Collecting package metadata (repodata.json): done
Solving environment: failed

PackagesNotFoundError: The following packages are not available from current channels:
  - qiskit-machine-learning=0.9.0*

Can anyone tell me how can i fix this?

• conda
• qiskit

Share Improve this question Follow edited 2 days ago diogomaia00 asked 2 days ago diogomaia00diogomaia00 122 bronze badges New contributor diogomaia00 is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.

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1 Answer 1

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Qiskit Machine Learning 0.9.0 has not been released. Its still work in progress and does not support Qiskit 2.0 either. Qiskit 0.44 is too old. The requirements need >1.0 see https://github/qiskit-community/qiskit-machine-learning/blob/0a114922a93b6b8921529ada886fe9be08f163b2/requirements.txt#L1 for this (that's on the 0.8 branch and on main its been pinned to <2.0 as well at present). Try installing the latest version prior to 2.0 i.e Qiskit 1.4.2 which should have things working for you.

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