[Cherrypick 2.3] fix decode jpeg example code (#42752)

* fix decode_jpeg example code * fix decode_jpeg example code

[Cherrypick 2.3] fix decode jpeg example code (#42752)
* fix decode_jpeg example code * fix decode_jpeg example code
a4c898cf · LielinJiang · GitHub · 0fb66355 · a4c898cf
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python/paddle/vision/ops.py python/paddle/vision/ops.py +3 -0

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--- a/python/paddle/vision/ops.py
+++ b/python/paddle/vision/ops.py
@@ -895,7 +895,10 @@ def decode_jpeg(x, mode='unchanged', name=None):

    Examples:
        .. code-block:: python
+
+            # required: gpu
            import cv2
+            import numpy as np
            import paddle

            fake_img = (np.random.random(