make scipy use the same mode as theano. warn that opencv don't use the same mode.

benchmark/convolution/bench.sh

@@ -2,4 +2,6 @@
 
 python opencv.py $@
 python conv2d.py $@
-python scipy_conv.py $@
+python scipy_conv.py $@
\ No newline at end of file
+
+echo "WARNING the mode is valid for theano and scipy, but opencv use the mode same! Can opencv do the mode full?"

benchmark/convolution/scipy_conv.py

@@ -23,7 +23,7 @@ img = numpy.ones(img_shape, dtype=dtype)
 ker = numpy.ones(ker_shape, dtype=dtype)
 
 def f():
-    convolve2d(img, ker)
+    convolve2d(img, ker, mode="valid")
 """)
 time = T.repeat(repeat=3, number=nb_call)
 print min(time), "scipy"