chore: import upstream snapshot with attribution

paddle/phi/kernels/strings/strings_empty_kernel.h

@@ -0,0 +1,68 @@
+// Copyright (c) 2022 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 "paddle/phi/api/lib/utils/allocator.h"
+#include "paddle/phi/common/int_array.h"
+#include "paddle/phi/core/string_tensor.h"
+#include "paddle/phi/infermeta/strings/nullary.h"
+#include "paddle/phi/infermeta/strings/unary.h"
+
+namespace phi {
+namespace strings {
+
+template <typename Context>
+void EmptyKernel(const Context& dev_ctx,
+                 const IntArray& shape,
+                 StringTensor* out);
+
+template <typename Context>
+void EmptyLikeKernel(const Context& dev_ctx, StringTensor* out);
+
+// TODO(zhoushunjie): the tensor creation method need to be replaced later,
+// all kernel api call Empty here instead of making tensor self
+template <typename Context>
+StringTensor Empty(const Context& dev_ctx, StringTensorMeta&& meta) {
+  auto allocator = std::make_unique<paddle::experimental::DefaultAllocator>(
+      dev_ctx.GetPlace());
+  phi::StringTensor string_out(allocator.get(), std::move(meta));
+  return string_out;
+}
+
+template <typename Context>
+StringTensor Empty(const Context& dev_ctx) {
+  return Empty<Context>(dev_ctx, {{-1}});
+}
+
+template <typename Context>
+StringTensor Empty(const Context& dev_ctx, const IntArray& shape) {
+  StringTensor string_out;
+  MetaTensor meta_out(&string_out);
+  phi::strings::CreateInferMeta(shape, &meta_out);
+  EmptyKernel<Context>(dev_ctx, shape, &string_out);
+  return string_out;
+}
+
+template <typename Context>
+StringTensor EmptyLike(const Context& dev_ctx, const StringTensor& x) {
+  StringTensor string_out;
+  MetaTensor meta_out(&string_out);
+  phi::strings::UnchangedInferMeta(x.meta(), &meta_out);
+  EmptyLikeKernel<Context>(dev_ctx, &string_out);
+  return string_out;
+}
+
+}  // namespace strings
+}  // namespace phi