chore: import upstream snapshot with attribution

paddle/fluid/framework/transfer_scope_cache.h

@@ -0,0 +1,48 @@
+// 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 <thread>  // NOLINT
+#include <unordered_map>
+#include <unordered_set>
+
+#include "paddle/fluid/framework/op_kernel_type.h"
+#include "paddle/fluid/framework/scope.h"
+#include "paddle/utils/test_macros.h"
+
+namespace paddle {
+namespace framework {
+
+class OpKernelType;
+class Scope;
+
+TEST_API std::unordered_map<size_t, Scope*>& global_transfer_data_cache();
+
+TEST_API std::unordered_set<Scope*>& global_transfer_scope_cache();
+
+std::unordered_map<const Scope*, std::unordered_set<size_t>>&
+global_transfer_scope_key();
+
+// Combine two hash values to a single hash.
+static size_t CombineHash(size_t seed, size_t a) {
+  return (seed ^ a) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+}
+
+Scope* TryCreateTransferScope(const phi::KernelKey& type0,
+                              const phi::KernelKey& type1,
+                              const Scope* scope);
+
+}  // namespace framework
+}  // namespace paddle