pass layer test

test=develop

python/paddle/fluid/layers/nn.py

@@ -5878,7 +5878,7 @@ def sampled_softmax_with_cross_entropy(logits,
             'ignore_index': False,
             'numeric_stable_mode': False
         })
-    return outputs / num_true
+    return loss / num_true
 
 
 def smooth_l1(x, y, inside_weight=None, outside_weight=None, sigma=None):

python/paddle/fluid/tests/unittests/test_layers.py

@@ -378,9 +378,10 @@ class TestBook(unittest.TestCase):
         program = Program()
         with program_guard(program):
             logits = layers.data(name='Logits', shape=[256], dtype='float64')
-            label = layers.data(name='Label', shape=[5], dtype='int64')
+            label = layers.data(name='Label', shape=[1], dtype='int64')
             num_samples = 25
-            output = layers.sample_logits(logits, label, num_samples)
+            output = layers.sampled_softmax_with_cross_entropy(logits, label,
+                                                               num_samples)
             self.assertIsNotNone(output)
         print(str(program))