Remove the requires of opencv-python.

python/paddle/utils/image_multiproc.py

@@ -12,7 +12,7 @@ from paddle.trainer.config_parser import logger
 try:
     import cv2
 except ImportError:
-    logger.warning("OpenCV2 is not installed, using PIL to prcoess")
+    logger.warning("OpenCV2 is not installed, using PIL to process")
     cv2 = None
 
 __all__ = ["CvTransformer", "PILTransformer", "MultiProcessImageTransformer"]

python/paddle/v2/image.py

@@ -3,7 +3,10 @@ try:
     import cv2
 except:
     print(
-        "import cv2 error, please install opencv-python: pip install opencv-python"
+        "import cv2 error, please install python wrapper of opencv using:\n"
+        "    pip install opencv-python\n"
+        "    or\n"
+        "    apt-get install python-opencv\n"
     )
 
 __all__ = [

python/setup.py.in

@@ -19,7 +19,6 @@ setup(name='paddle',
           "numpy",
           "protobuf==${PROTOBUF_VERSION}",
           "matplotlib",
-          "opencv-python",
           "rarfile"
       ],
       packages=packages,