Dctor cache

Author: reyoung

paddle/fluid/operators/reader/create_double_buffer_reader_op.cc

@@ -52,6 +52,8 @@ class DoubleBufferReader : public framework::DecoratedReader {
 
   void ReadNextImpl(std::vector<framework::LoDTensor>* out) override;
 
+  ~DoubleBufferReader() { Shutdown(); }
+
  private:
   void ShutdownImpl() override {
     reader_->Shutdown();

python/paddle/fluid/tests/demo/pyreader.py

@@ -100,7 +100,7 @@ def main():
                     trainer.run(fetch_list=[loss.name]))
         except fluid.core.EOFException:
             print 'End of epoch', epoch_id
-            # train_reader.reset()
+            train_reader.reset()
         train_data_thread.join()
 
         test_data_thread = pipe_reader_to_queue(
@@ -111,7 +111,7 @@ def main():
                     tester.run(fetch_list=[test_loss.name]))
         except fluid.core.EOFException:
             print 'End of testing'
-            # test_reader.reset()
+            test_reader.reset()
 
         test_data_thread.join()
         break