diff --git a/python/caffe/net_spec.py b/python/caffe/net_spec.py
index 1b4814a45c6..b1cc0130b94 100644
--- a/python/caffe/net_spec.py
+++ b/python/caffe/net_spec.py
@@ -90,6 +90,16 @@ def to_proto(self):
         return to_proto(self)
 
 
+class NoTop:
+    """ Special class for layers without a top """
+
+    def __init__(self, fn):
+        self.fn = fn
+
+    def to_proto(self):
+        return to_proto(self)
+
+
 class Function(object):
     """A Function specifies a layer, its parameters, and its inputs (which
     are Tops from other layers)."""
@@ -105,7 +115,10 @@ def __init__(self, type_name, inputs, params):
         self.in_place = self.params.get('in_place', False)
         if 'in_place' in self.params:
             del self.params['in_place']
-        self.tops = tuple(Top(self, n) for n in range(self.ntop))
+        if self.ntop == 0:
+            self.tops = (NoTop(self),)
+        else:
+            self.tops = tuple(Top(self, n) for n in range(self.ntop))
 
     def _get_name(self, top, names, autonames):
         if top not in names:
@@ -129,7 +142,8 @@ def _to_proto(self, layers, names, autonames):
             layer.top.extend(layer.bottom)
         else:
             for top in self.tops:
-                layer.top.append(self._get_name(top, names, autonames))
+                if not isinstance(top,NoTop):
+                    layer.top.append(self._get_name(top, names, autonames))
         layer.name = self._get_name(self.tops[0], names, autonames)
 
         for k, v in six.iteritems(self.params):
@@ -180,7 +194,7 @@ class Layers(object):
     def __getattr__(self, name):
         def layer_fn(*args, **kwargs):
             fn = Function(name, args, kwargs)
-            if fn.ntop == 1:
+            if fn.ntop <= 1:
                 return fn.tops[0]
             else:
                 return fn.tops