Capitalize and add punctuation to comment

tests/test_theano.py

@@ -5,16 +5,16 @@
 
 class TestTheano(unittest.TestCase):
     def test_addition(self):
-        # declare two symbolic floating-point scalars
+        # Declare two symbolic floating-point scalars.
         a = tensor.dscalar()
         b = tensor.dscalar()
 
-        # create a simple expression
+        # Create a simple expression.
         c = a + b
 
-        # convert the expression into a callable object that takes (a,b)
-        # values as input and computes a value for c
+        # Convert the expression into a callable object that takes (a,b)
+        # values as input and computes a value for 'c'.
         f = theano.function([a,b], c)
 
-        # bind 1.5 to 'a', 2.5 to 'b', and evaluate 'c'
+        # Bind 1.5 to 'a', 2.5 to 'b', and evaluate 'c'.
         self.assertEqual(4.0, f(1.5, 2.5))