Add check for filter_size to be tuple

Author: yobibyte

.gitignore

@@ -2,5 +2,5 @@ __pycache__
 *.pyc
 DeepFried2.egg-info/
 examples/Kaggle-Otto/data/
-/build
-/dist
+build
+dist

DeepFried2/layers/SpatialConvolutionCUDNN.py

@@ -13,6 +13,10 @@ def __init__(self, nchan_in, nchan_out, filter_size, stride=1, border=0, mode='c
         # 3: https://github.com/vlfeat/matconvnet/blob/b7dd9c96/matlab/src/bits/impl/nnconv_cudnn.cu#L133
         # 4: https://github.com/BVLC/caffe/blob/50ab52cb/include/caffe/util/cudnn.hpp#L104
         df.Module.__init__(self)
+        
+        # Catch a probably common bug while we transition the API.
+        assert isinstance(filter_size, (list, tuple)), "New conv API: filter_size needs to be a tuple!"
+
         self.nchan_in = nchan_in
         self.nchan_out = nchan_out
         self.filter_size = filter_size