chore: import upstream snapshot with attribution

paddle/fluid/framework/transfer_scope_cache.cc

@@ -0,0 +1,59 @@
+// 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/transfer_scope_cache.h"
+
+namespace paddle::framework {
+
+std::unordered_map<size_t, Scope*>& global_transfer_data_cache() {
+  thread_local auto* x = new std::unordered_map<size_t, Scope*>;
+  return *x;
+}
+
+std::unordered_set<Scope*>& global_transfer_scope_cache() {
+  thread_local auto* x = new std::unordered_set<Scope*>;
+  return *x;
+}
+
+std::unordered_map<const Scope*, std::unordered_set<size_t>>&
+global_transfer_scope_key() {
+  thread_local auto* x =
+      new std::unordered_map<const Scope*, std::unordered_set<size_t>>;
+  return *x;
+}
+
+Scope* TryCreateTransferScope(const phi::KernelKey& type0,
+                              const phi::KernelKey& type1,
+                              const Scope* scope) {
+  Scope* new_scope{nullptr};
+  size_t infer_cache_key =
+      CombineHash(static_cast<size_t>(phi::KernelKey::Hash()(type0)),
+                  static_cast<size_t>(phi::KernelKey::Hash()(type1)));
+  infer_cache_key =
+      CombineHash(infer_cache_key, std::hash<const Scope*>()(scope));
+
+  global_transfer_scope_key()[scope].insert(infer_cache_key);  //  NOLINT
+
+  auto it = global_transfer_data_cache().find(infer_cache_key);
+  if (it != global_transfer_data_cache().end()) {
+    new_scope = global_transfer_data_cache()[infer_cache_key];
+  } else {
+    new_scope = &scope->NewScope();
+    global_transfer_data_cache()[infer_cache_key] = new_scope;
+  }
+  global_transfer_scope_cache().insert(new_scope);
+  return new_scope;
+}
+
+}  // namespace paddle::framework