Fix num_residual_units for w28-10

Fix num_residual_units for w28-10

resnet/resnet_model.py

@@ -85,7 +85,7 @@ class ResNet(object):
       # comparably good performance.
       # https://arxiv.org/pdf/1605.07146v1.pdf
       # filters = [16, 160, 320, 640]
-      # Update hps.num_residual_units to 9
+      # Update hps.num_residual_units to 4
 
     with tf.variable_scope('unit_1_0'):
       x = res_func(x, filters[0], filters[1], self._stride_arr(strides[0]),