{ lib
, pythonOlder
, pythonAtLeast
, buildPythonPackage
, fetchFromGitHub
, fetchpatch
  # Python Inputs
, fastdtw
, numpy
, psutil
, qiskit-terra
, scikit-learn
, sparse
  # Optional inputs
, withTorch ? true
, pytorch
  # Check Inputs
, pytestCheckHook
, ddt
, pytest-timeout
, qiskit-aer
}:

buildPythonPackage rec {
  pname = "qiskit-machine-learning";
  version = "0.2.1";

  disabled = pythonOlder "3.6";

  src = fetchFromGitHub {
    owner = "qiskit";
    repo = pname;
    rev = version;
    sha256 = "sha256-2dfrkNZYSaXwiOCaRrPckq4BllANgc6BogyBcP0vosY=";
  };

  propagatedBuildInputs = [
    fastdtw
    numpy
    psutil
    qiskit-terra
    scikit-learn
    sparse
  ] ++ lib.optional withTorch pytorch;

  doCheck = false;  # TODO: enable. Tests fail on unstable due to some multithreading issue?
  checkInputs = [
    pytestCheckHook
    pytest-timeout
    ddt
    qiskit-aer
  ];

  pythonImportsCheck = [ "qiskit_machine_learning" ];

  pytestFlagsArray = [
    "--durations=10"
    "--showlocals"
    "-vv"
    "--ignore=test/connectors/test_torch_connector.py"  # TODO: fix, get multithreading errors with python3.9, segfaults
  ];
  disabledTests = [
    # Slow tests >10 s
    "test_readme_sample"
    "test_vqr_8"
    "test_vqr_7"
    "test_qgan_training_cg"
    "test_vqc_4"
    "test_classifier_with_circuit_qnn_and_cross_entropy_4"
    "test_vqr_4"
    "test_regressor_with_opflow_qnn_4"
    "test_qgan_save_model"
    "test_qgan_training_analytic_gradients"
    "test_qgan_training_run_algo_numpy"
    "test_ad_hoc_data"
    "test_qgan_training"
  ];

  meta = with lib; {
    description = "Software for developing quantum computing programs";
    homepage = "https://qiskit.org";
    downloadPage = "https://github.com/QISKit/qiskit-optimization/releases";
    changelog = "https://qiskit.org/documentation/release_notes.html";
    license = licenses.asl20;
    maintainers = with maintainers; [ drewrisinger ];
  };
}