add scope_pool

add module cleanup
test=develop

paddle/contrib/float16/float16_transpiler.py

@@ -60,7 +60,7 @@ class Float16Transpiler:
             raise TypeError("place should be as CPUPlace/CUDAPlace type")
         if scope is None:
             scope = global_scope()
-        if not isinstance(scope, core.Scope):
+        if not isinstance(scope, core._Scope):
             raise TypeError("scope should be as Scope type or None")
 
         self.scope = scope

paddle/fluid/framework/CMakeLists.txt

@@ -84,6 +84,7 @@ cc_library(threadpool SRCS threadpool.cc DEPS enforce)
 cc_test(threadpool_test SRCS threadpool_test.cc DEPS threadpool)
 
 cc_library(scope SRCS scope.cc DEPS glog threadpool)
+cc_library(scope_pool SRCS scope_pool.cc DEPS scope)
 cc_test(scope_test SRCS scope_test.cc DEPS scope)
 
 cc_library(data_device_transform SRCS data_device_transform.cc DEPS tensor)

paddle/fluid/framework/scope_pool.cc

@@ -0,0 +1,54 @@
+// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "paddle/fluid/framework/scope_pool.h"
+#include "paddle/fluid/framework/threadpool.h"
+
+namespace paddle {
+namespace framework {
+
+ScopePool &ScopePool::Instance() {  // NOLINT
+  static ScopePool pool;
+  return pool;
+}
+
+void ScopePool::DeleteScope(Scope *scope) { delete scope; }
+
+void ScopePool::Insert(std::unique_ptr<Scope> &&s) {
+  std::lock_guard<std::mutex> guard(mtx_);
+  scopes_.insert(s.release());
+}
+
+void ScopePool::Remove(Scope *s) {
+  size_t has_scope;
+  {
+    std::lock_guard<std::mutex> guard(mtx_);
+    has_scope = scopes_.erase(s);
+  }
+  PADDLE_ENFORCE(has_scope > 0, "Delete non-existing global scope");
+  DeleteScope(s);
+}
+
+ScopePool::~ScopePool() { Clear(); }
+
+void ScopePool::Clear() {
+  std::lock_guard<std::mutex> guard(mtx_);
+  for (auto *s : scopes_) {
+    DeleteScope(s);
+  }
+  scopes_.clear();
+}
+
+}  // namespace framework
+}  // namespace paddle

paddle/fluid/framework/scope_pool.h

@@ -0,0 +1,46 @@
+// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <mutex>  // NOLINT
+#include <unordered_set>
+#include "paddle/fluid/framework/scope.h"
+
+namespace paddle {
+namespace framework {
+
+class ScopePool {
+ public:
+  static ScopePool &Instance();  // NOLINT
+
+  void Insert(std::unique_ptr<Scope> &&s);
+
+  void Remove(Scope *s);
+
+  void Clear();
+
+  ~ScopePool();
+
+ private:
+  ScopePool() = default;
+
+  static void DeleteScope(Scope *scope);
+
+  std::unordered_set<Scope *> scopes_;
+  std::mutex mtx_;
+};
+
+}  // namespace framework
+}  // namespace paddle

paddle/fluid/pybind/CMakeLists.txt

@@ -1,5 +1,5 @@
 
-set(PYBIND_DEPS pybind python proto_desc memory executor async_executor prune feed_fetch_method pass_builder parallel_executor profiler layer)
+set(PYBIND_DEPS pybind python proto_desc memory executor async_executor prune feed_fetch_method pass_builder parallel_executor profiler layer scope_pool)
 if(WITH_PYTHON)
   list(APPEND PYBIND_DEPS py_func_op)
 endif()

paddle/fluid/pybind/pybind.cc

@@ -32,6 +32,7 @@ limitations under the License. */
 #include "paddle/fluid/framework/parallel_executor.h"
 #include "paddle/fluid/framework/prune.h"
 #include "paddle/fluid/framework/reader.h"
+#include "paddle/fluid/framework/scope_pool.h"
 #include "paddle/fluid/framework/selected_rows.h"
 #include "paddle/fluid/framework/version.h"
 #include "paddle/fluid/imperative/layer.h"
@@ -117,6 +118,9 @@ PYBIND11_MODULE(core, m) {
         return paddle::operators::AppendPythonCallableObjectAndReturnId(py_obj);
       });
 
+  m.add_object("_cleanup",
+               py::capsule([]() { ScopePool::Instance().Clear(); }));
+
   py::class_<imperative::VarBase, PyVarBase>(m, "VarBase", R"DOC()DOC")
       .def(py::init<>())
       .def("_run_backward",
@@ -454,7 +458,7 @@ All parameter, weight, gradient are variables in Paddle.
             },
         py::return_value_policy::copy);
 
-  py::class_<Scope>(m, "Scope", R"DOC(
+  py::class_<Scope>(m, "_Scope", R"DOC(
     Scope is an association of a name to Variable. All variables belong to Scope.
 
     Variables in a parent scope can be retrieved from local scope.
@@ -474,17 +478,26 @@ All parameter, weight, gradient are variables in Paddle.
           param.set(param_array, place)
 
         )DOC")
+      .def("_remove_from_pool",
+           [](Scope &self) { ScopePool::Instance().Remove(&self); })
       .def("var",
            [](Scope &self, const std::string &name) -> Variable * {
              return self.Var(name);
            },
            py::return_value_policy::reference)
       .def("find_var", &Scope::FindVar, py::return_value_policy::reference)
-      .def(py::init<>())
       .def("new_scope", [](Scope &self) -> Scope * { return &self.NewScope(); },
            py::return_value_policy::reference)
       .def("drop_kids", &Scope::DropKids);
 
+  m.def("Scope",
+        []() -> Scope * {
+          auto *s = new Scope();
+          ScopePool::Instance().Insert(std::unique_ptr<Scope>(s));
+          return s;
+        },
+        py::return_value_policy::reference);
+
   //! @note: Be careful! PyBind will return std::string as an unicode, not
   //! Python str. If you want a str object, you should cast them in Python.
   m.def("get_all_op_protos", []() -> std::vector<py::bytes> {

python/paddle/fluid/__init__.py

@@ -46,7 +46,7 @@ from . import transpiler
 from . import distribute_lookup_table
 from .param_attr import ParamAttr, WeightNormParamAttr
 from .data_feeder import DataFeeder
-from .core import LoDTensor, LoDTensorArray, CPUPlace, CUDAPlace, CUDAPinnedPlace, Scope
+from .core import LoDTensor, LoDTensorArray, CPUPlace, CUDAPlace, CUDAPinnedPlace, Scope, _Scope
 from .transpiler import DistributeTranspiler, \
     memory_optimize, release_memory, DistributeTranspilerConfig
 from .lod_tensor import create_lod_tensor, create_random_int_lodtensor

python/paddle/fluid/executor.py

@@ -191,7 +191,7 @@ def _fetch_var(name, scope=None, return_numpy=True):
     assert isinstance(name, str)
     if scope is None:
         scope = global_scope()
-    assert isinstance(scope, core.Scope)
+    assert isinstance(scope, core._Scope)
 
     var = scope.find_var(name)
     assert var is not None, (

python/paddle/fluid/tests/unittests/test_py_func_op.py

@@ -26,7 +26,7 @@ os.environ['CPU_NUM'] = str(dev_cnt)
 
 
 def dummy_func_with_no_input():
-    return float(1.0)
+    return np.array([0], dtype='float32')
 
 
 def dummy_func_with_no_output(x):
@@ -105,7 +105,7 @@ def simple_fc_net(img, label, use_py_func_op):
             name='test_tmp_var', dtype='float32', shape=[1])
         fluid.layers.py_func(
             func=dummy_func_with_no_input, x=None, out=dummy_var)
-
+        loss += dummy_var
         fluid.layers.py_func(func=dummy_func_with_no_output, x=loss, out=None)
 
     loss = fluid.layers.mean(loss)
@@ -174,7 +174,7 @@ class TestPyFuncOpUseExecutor(unittest.TestCase):
             self.assertAlmostEqual(max_diff, 0, delta=1e-3)
 
 
-class TestPyFuncOpUseParallelExecutor(unittest.TestCase):
+class TestPyFuncOpUseParallelExecutor(TestPyFuncOpUseExecutor):
     def setUp(self):
         self.use_parallel_executor = True
 

python/paddle/fluid/transpiler/inference_transpiler.py

@@ -57,7 +57,7 @@ class InferenceTranspiler(object):
             raise TypeError("place should be as CPUPlace/CUDAPlace type")
         if scope is None:
             scope = global_scope()
-        if not isinstance(scope, core.Scope):
+        if not isinstance(scope, core._Scope):
             raise TypeError("scope should be as Scope type or None")
         use_mkldnn = bool(os.getenv("FLAGS_use_mkldnn", False))