comments to tests

theano/tensor/tests/test_opt.py

@@ -5400,30 +5400,37 @@ class TestIntDivByOne(unittest.TestCase):
         self.mode = self.mode.including('local_intdiv_by_one')
 
     def test1(self):
+        """Tests removing the extra floor_div by 1 introduced by
+        local_subtensor_merge optimization"""
         y = T.tensor4('y')
         self.mode = self.mode.excluding('fusion')
         f = theano.function([y], y[::-1][::-1], mode=self.mode)
 
         graph = f.maker.fgraph.toposort()
-        divs = [node for node in graph if isinstance(node.op, T.elemwise.Elemwise) and
+        divs = [node for node in graph
+                if isinstance(node.op, T.elemwise.Elemwise) and
                 isinstance(node.op.scalar_op, theano.scalar.IntDiv)]
         assert len(divs) == 0
     
     def test2(self):
+        """Simple test case for removing dividing by 1"""
         y = T.tensor4('y')
         z = y // 1
         f = theano.function([y], z, mode = self.mode)
         graph = f.maker.fgraph.toposort()
-        divs = [node for node in graph if isinstance(node.op, T.elemwise.Elemwise) and
+        divs = [node for node in graph
+                if isinstance(node.op, T.elemwise.Elemwise) and
                 isinstance(node.op.scalar_op, theano.scalar.IntDiv)]
         assert len(divs) == 0
 
     def test3(self):
+        """Simple test case for removing dividing by a tensor of ones"""
         y = T.tensor4('y')
         z = y // numpy.ones((2,2,2,2))
         f = theano.function([y], z, mode=self.mode)
         graph = f.maker.fgraph.toposort()
-        divs = [node for node in graph if isinstance(node.op, T.elemwise.Elemwise) and
+        divs = [node for node in graph
+                if isinstance(node.op, T.elemwise.Elemwise) and
                 isinstance(node.op.scalar_op, theano.scalar.IntDiv)]
         assert len(divs) == 0