Merge pull request #1625 from shippingwang/fix_infer_bug

Fixed image classification infer 

fluid/PaddleCV/image_classification/infer.py

@@ -11,7 +11,6 @@ import models
 import reader
 import argparse
 import functools
-from models.learning_rate import cosine_decay
 from utility import add_arguments, print_arguments
 import math
 
@@ -44,7 +43,6 @@ def infer(args):
 
     # model definition
     model = models.__dict__[model_name]()
-
     if model_name is "GoogleNet":
         out, _, _ = model.net(input=image, class_dim=class_dim)
     else:
@@ -52,8 +50,10 @@ def infer(args):
 
     test_program = fluid.default_main_program().clone(for_test=True)
 
+    fetch_list = [out.name]
     if with_memory_optimization:
-        fluid.memory_optimize(fluid.default_main_program())
+        fluid.memory_optimize(
+            fluid.default_main_program(), skip_opt_set=set(fetch_list))
 
     place = fluid.CUDAPlace(0) if args.use_gpu else fluid.CPUPlace()
     exe = fluid.Executor(place)
@@ -70,8 +70,6 @@ def infer(args):
     test_reader = paddle.batch(reader.test(), batch_size=test_batch_size)
     feeder = fluid.DataFeeder(place=place, feed_list=[image])
 
-    fetch_list = [out.name]
-
     TOPK = 1
     for batch_id, data in enumerate(test_reader()):
         result = exe.run(test_program,