Fix default mode warning in io.resize_image

Signed-off-by: Finnian Anderson <get@finnian.io>

python/caffe/io.py

@@ -323,7 +323,7 @@ def resize_image(im, new_dims, interp_order=1):
             # skimage is fast but only understands {1,3} channel images
             # in [0, 1].
             im_std = (im - im_min) / (im_max - im_min)
-            resized_std = resize(im_std, new_dims, order=interp_order)
+            resized_std = resize(im_std, new_dims, order=interp_order, mode='constant')
             resized_im = resized_std * (im_max - im_min) + im_min
         else:
             # the image is a constant -- avoid divide by 0