Support bytes input for decode op

mindspore/dataset/vision/c_transforms.py

@@ -432,7 +432,9 @@ class Decode(ImageTensorOperation):
         Returns:
             img (NumPy), Decoded image.
         """
-        if not isinstance(img, np.ndarray) or img.ndim != 1 or img.dtype.type is np.str_:
+        if isinstance(img, bytes):
+            img = np.frombuffer(img, np.uint8)
+        elif not isinstance(img, np.ndarray) or img.ndim != 1 or img.dtype.type is np.str_:
             raise TypeError(
                 "Input should be an encoded image in 1-D NumPy format, got {}.".format(type(img)))
         return super().__call__(img)

tests/ut/python/dataset/test_eager_vision.py

@@ -25,9 +25,15 @@ def test_eager_decode():
 
     img = C.Decode()(img)
     logger.info("Image.type: {}, Image.shape: {}".format(type(img), img.shape))
-
     assert img.shape == (2268, 4032, 3)
 
+    fp = open("../data/dataset/apple.jpg", "rb")
+    img2 = fp.read()
+
+    img2 = C.Decode()(img2)
+    logger.info("Image.type: {}, Image.shape: {}".format(type(img2), img2.shape))
+    assert img2.shape == (2268, 4032, 3)
+
 
 def test_eager_resize():
     img = cv2.imread("../data/dataset/apple.jpg")