fix flake8 error in test_broadcastable

theano/sandbox/tests/test_rng_mrg.py

@@ -633,13 +633,13 @@ def test_broadcastable():
     size1 = (10, 1)
     size2 = (x.shape[0], 1)
     pvals_1 = numpy.random.uniform(0, 1, size=size1)
-    pvals_1 = pvals_1/sum(pvals_1)
+    pvals_1 = pvals_1 / sum(pvals_1)
     pvals_2 = R.uniform(size=size2)
-    pvals_2 = pvals_2/tensor.sum(pvals_2)
+    pvals_2 = pvals_2 / tensor.sum(pvals_2)
 
     for distribution in [R.uniform, R.binomial, R.multinomial, R.multinomial_wo_replacement, R.normal]:
         # multinomial or multinomial_wo_replacement does not support "size" argument,
-        # the size of them are implicitly defined with "pvals" argument.
+        # the sizes of them are implicitly defined with "pvals" argument.
         if distribution in [R.multinomial, R.multinomial_wo_replacement]:
             # check when all dimensions are constant
             uu = distribution(pvals=pvals_1)