uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/python-modules/pytorch-metric-learning/default.nix

@@ -0,0 +1,64 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, isPy27
+, numpy
+, scikit-learn
+, pytestCheckHook
+, pytorch
+, torchvision
+, tqdm
+}:
+
+buildPythonPackage rec {
+  pname   = "pytorch-metric-learning";
+  version = "1.2.0";
+
+  disabled = isPy27;
+
+  src = fetchFromGitHub {
+    owner = "KevinMusgrave";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-M/iH+pIuamOmvxLtKMzWXiuMCnMXzpVFRb/HfYfCKdc=";
+  };
+
+  propagatedBuildInputs = [
+    numpy
+    pytorch
+    scikit-learn
+    torchvision
+    tqdm
+  ];
+
+  preCheck = ''
+    export HOME=$TMP
+    export TEST_DEVICE=cpu
+    export TEST_DTYPES=float32,float64  # half-precision tests fail on CPU
+  '';
+  # package only requires `unittest`, but use `pytest` to exclude tests
+  checkInputs = [ pytestCheckHook ];
+  disabledTests = [
+    # requires FAISS (not in Nixpkgs)
+    "test_accuracy_calculator_and_faiss"
+    "test_global_embedding_space_tester"
+    "test_with_same_parent_label_tester"
+    # require network access:
+    "test_get_nearest_neighbors"
+    "test_tuplestoweights_sampler"
+    "test_untrained_indexer"
+    "test_metric_loss_only"
+    "test_pca"
+    # flaky
+    "test_distributed_classifier_loss_and_miner"
+  ];
+
+  meta = {
+    description = "Metric learning library for PyTorch";
+    homepage = "https://github.com/KevinMusgrave/pytorch-metric-learning";
+    changelog = "https://github.com/KevinMusgrave/pytorch-metric-learning/releases/tag/v${version}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ bcdarwin ];
+    broken = true;  # requires faiss which is unpackaged
+  };
+}