Fix RNN unittest bugs.

* The DataProvider should be INCREF every time.

paddle/gserver/dataproviders/PyDataProvider2.cpp

@@ -252,19 +252,9 @@ private:
     // only for instance will make python reference-count error.
     //
     // So here, we increase reference count manually.
-    if (gModuleClsPtrs_.find((uintptr_t)module.get()) !=
-        gModuleClsPtrs_.end()) {
-      // Multi instance use same module
     Py_XINCREF(module.get());
     Py_XINCREF(moduleDict.get());
-    } else {
-      gModuleClsPtrs_.insert((uintptr_t)module.get());
-    }
-    if (gModuleClsPtrs_.find((uintptr_t)cls.get()) != gModuleClsPtrs_.end()) {
     Py_XINCREF(cls.get());
-    } else {
-      gModuleClsPtrs_.insert((uintptr_t)cls.get());
-    }
 
     PyObjectPtr fileListInPy = loadPyFileLists(fileListName);
     PyDict_SetItemString(kwargs.get(), "file_list", fileListInPy.get());
@@ -471,7 +461,6 @@ private:
   std::vector<std::string> fileLists_;
   std::vector<SlotHeader> headers_;
   static PyObjectPtr zeroTuple_;
-  static std::unordered_set<uintptr_t> gModuleClsPtrs_;
 
   class PositionRandom {
   public:
@@ -671,7 +660,6 @@ public:
   }
 };
 
-std::unordered_set<uintptr_t> PyDataProvider2::gModuleClsPtrs_;
 PyObjectPtr PyDataProvider2::zeroTuple_(PyTuple_New(0));
 
 REGISTER_DATA_PROVIDER_EX(py2, PyDataProvider2);

paddle/gserver/tests/test_RecurrentGradientMachine.cpp

@@ -127,7 +127,7 @@ TEST(RecurrentGradientMachine, HasSubSequence) {
   }
 }
 
-TEST(RecurrentGradientMachine, DISABLED_rnn) {
+TEST(RecurrentGradientMachine, rnn) {
   for (bool useGpu : {false, true}) {
     test("gserver/tests/sequence_rnn.conf",
          "gserver/tests/sequence_nest_rnn.conf",
@@ -136,7 +136,7 @@ TEST(RecurrentGradientMachine, DISABLED_rnn) {
   }
 }
 
-TEST(RecurrentGradientMachine, DISABLED_rnn_multi_input) {
+TEST(RecurrentGradientMachine, rnn_multi_input) {
   for (bool useGpu : {false, true}) {
     test("gserver/tests/sequence_rnn_multi_input.conf",
          "gserver/tests/sequence_nest_rnn_multi_input.conf",
@@ -145,7 +145,7 @@ TEST(RecurrentGradientMachine, DISABLED_rnn_multi_input) {
   }
 }
 
-TEST(RecurrentGradientMachine, DISABLED_rnn_multi_unequalength_input) {
+TEST(RecurrentGradientMachine, rnn_multi_unequalength_input) {
   for (bool useGpu : {false, true}) {
     test("gserver/tests/sequence_rnn_multi_unequalength_inputs.py",
          "gserver/tests/sequence_nest_rnn_multi_unequalength_inputs.py",