Clean up jpeg tests (#7820)

test/test_image.py

@@ -422,77 +422,6 @@ def test_encode_jpeg_errors():
         encode_jpeg(torch.empty((100, 100), dtype=torch.uint8))
 
 
-def _collect_if(cond):
-    # TODO: remove this once test_encode_jpeg_reference and test_write_jpeg_reference
-    # are removed
-    def _inner(test_func):
-        if cond:
-            return test_func
-        else:
-            return pytest.mark.dont_collect(test_func)
-
-    return _inner
-
-
-@_collect_if(cond=False)
-@pytest.mark.parametrize(
-    "img_path",
-    [pytest.param(jpeg_path, id=_get_safe_image_name(jpeg_path)) for jpeg_path in get_images(ENCODE_JPEG, ".jpg")],
-)
-def test_encode_jpeg_reference(img_path):
-    # This test is *wrong*.
-    # It compares a torchvision-encoded jpeg with a PIL-encoded jpeg (the reference), but it
-    # starts encoding the torchvision version from an image that comes from
-    # decode_jpeg, which can yield different results from pil.decode (see
-    # test_decode... which uses a high tolerance).
-    # Instead, we should start encoding from the exact same decoded image, for a
-    # valid comparison. This is done in test_encode_jpeg, but unfortunately
-    # these more correct tests fail on windows (probably because of a difference
-    # in libjpeg) between torchvision and PIL.
-    # FIXME: make the correct tests pass on windows and remove this.
-    dirname = os.path.dirname(img_path)
-    filename, _ = os.path.splitext(os.path.basename(img_path))
-    write_folder = os.path.join(dirname, "jpeg_write")
-    expected_file = os.path.join(write_folder, f"{filename}_pil.jpg")
-    img = decode_jpeg(read_file(img_path))
-
-    with open(expected_file, "rb") as f:
-        pil_bytes = f.read()
-        pil_bytes = torch.as_tensor(list(pil_bytes), dtype=torch.uint8)
-    for src_img in [img, img.contiguous()]:
-        # PIL sets jpeg quality to 75 by default
-        jpeg_bytes = encode_jpeg(src_img, quality=75)
-        assert_equal(jpeg_bytes, pil_bytes)
-
-
-@_collect_if(cond=False)
-@pytest.mark.parametrize(
-    "img_path",
-    [pytest.param(jpeg_path, id=_get_safe_image_name(jpeg_path)) for jpeg_path in get_images(ENCODE_JPEG, ".jpg")],
-)
-def test_write_jpeg_reference(img_path, tmpdir):
-    # FIXME: Remove this eventually, see test_encode_jpeg_reference
-    data = read_file(img_path)
-    img = decode_jpeg(data)
-
-    basedir = os.path.dirname(img_path)
-    filename, _ = os.path.splitext(os.path.basename(img_path))
-    torch_jpeg = os.path.join(tmpdir, f"{filename}_torch.jpg")
-    pil_jpeg = os.path.join(basedir, "jpeg_write", f"{filename}_pil.jpg")
-
-    write_jpeg(img, torch_jpeg, quality=75)
-
-    with open(torch_jpeg, "rb") as f:
-        torch_bytes = f.read()
-
-    with open(pil_jpeg, "rb") as f:
-        pil_bytes = f.read()
-
-    assert_equal(torch_bytes, pil_bytes)
-
-
-# TODO: Remove the skip. See https://github.com/pytorch/vision/issues/5162.
-@pytest.mark.skip("this test fails because PIL uses libjpeg-turbo")
 @pytest.mark.parametrize(
     "img_path",
     [pytest.param(jpeg_path, id=_get_safe_image_name(jpeg_path)) for jpeg_path in get_images(ENCODE_JPEG, ".jpg")],
@@ -511,8 +440,6 @@ def test_encode_jpeg(img_path):
         assert_equal(encoded_jpeg_torch, encoded_jpeg_pil)
 
 
-# TODO: Remove the skip. See https://github.com/pytorch/vision/issues/5162.
-@pytest.mark.skip("this test fails because PIL uses libjpeg-turbo")
 @pytest.mark.parametrize(
     "img_path",
     [pytest.param(jpeg_path, id=_get_safe_image_name(jpeg_path)) for jpeg_path in get_images(ENCODE_JPEG, ".jpg")],