Correct the use of the lstm layer

python/paddle/fluid/tests/book/test_label_semantic_roles.py

@@ -76,7 +76,7 @@ def db_lstm(word, predicate, ctx_n2, ctx_n1, ctx_0, ctx_p1, ctx_p2, mark,
     emb_layers.append(mark_embedding)
 
     hidden_0_layers = [
-        fluid.layers.fc(input=emb, size=hidden_dim, act='tanh')
+        fluid.layers.fc(input=emb, size=hidden_dim)
         for emb in emb_layers
     ]
 
@@ -94,8 +94,8 @@ def db_lstm(word, predicate, ctx_n2, ctx_n1, ctx_0, ctx_p1, ctx_p2, mark,
 
     for i in range(1, depth):
         mix_hidden = fluid.layers.sums(input=[
-            fluid.layers.fc(input=input_tmp[0], size=hidden_dim, act='tanh'),
-            fluid.layers.fc(input=input_tmp[1], size=hidden_dim, act='tanh')
+            fluid.layers.fc(input=input_tmp[0], size=hidden_dim),
+            fluid.layers.fc(input=input_tmp[1], size=hidden_dim)
         ])
 
         lstm = fluid.layers.dynamic_lstm(