change the target cost of test_label_semantic_roles to speed up test

Author: jacquesqiao

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

@@ -38,7 +38,7 @@
 mix_hidden_lr = 1e-3
 
 IS_SPARSE = True
-PASS_NUM = 1
+PASS_NUM = 2
 BATCH_SIZE = 10
 
 embedding_name = 'emb'
@@ -196,7 +196,7 @@ def train_loop(main_program):
                         print("second per batch: " + str((time.time(
                         ) - start_time) / batch_id))
                     # Set the threshold low to speed up the CI test
-                    if float(cost) < 60.0:
+                    if float(cost) < 80.0:
                         if save_dirname is not None:
                             # TODO(liuyiqun): Change the target to crf_decode
                             fluid.io.save_inference_model(save_dirname, [