Put pytestmark at top of file (#8032)

test/test_transforms_v2.py

@@ -52,6 +52,10 @@ from torchvision.transforms.v2.functional._geometry import _get_perspective_coef
 from torchvision.transforms.v2.functional._utils import _get_kernel, _register_kernel_internal
 
 
+# turns all warnings into errors for this module
+pytestmark = pytest.mark.filterwarnings("error")
+
+
 @pytest.fixture(autouse=True)
 def fix_rng_seed():
     set_rng_seed(0)
@@ -539,10 +543,6 @@ def reference_affine_bounding_boxes_helper(bounding_boxes, *, affine_matrix, new
     )
 
 
-# turns all warnings into errors for this module
-pytestmark = pytest.mark.filterwarnings("error")
-
-
 class TestResize:
     INPUT_SIZE = (17, 11)
     OUTPUT_SIZES = [17, [17], (17,), [12, 13], (12, 13)]