chore: import upstream snapshot with attribution

paddle/phi/kernels/cpu/take_along_axis_kernel.cc

@@ -0,0 +1,67 @@
+// 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.
+
+#include "paddle/phi/kernels/take_along_axis_kernel.h"
+
+#include "paddle/phi/backends/cpu/cpu_context.h"
+#include "paddle/phi/common/data_type.h"
+#include "paddle/phi/common/place.h"
+#include "paddle/phi/core/kernel_registry.h"
+#include "paddle/phi/kernels/full_kernel.h"
+#include "paddle/phi/kernels/funcs/gather_scatter_functor.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void TakeAlongAxisKernel(const Context& dev_ctx,
+                         const DenseTensor& x,
+                         const DenseTensor& index,
+                         int axis,
+                         DenseTensor* out) {
+  if (index.numel() == 0) {
+    dev_ctx.template Alloc<T>(out);
+    return;
+  }
+  if (x.numel() == 0) {
+    Full<T, Context>(dev_ctx, out->dims(), static_cast<T>(0), out);
+    return;
+  }
+
+  out->Resize(index.dims());
+  dev_ctx.template Alloc<T>(out);
+
+  if (out->numel() == 0) {
+    return;
+  }
+
+  const auto& index_type = index.dtype();
+  if (index_type == DataType::INT32) {
+    funcs::cpu_gather_kernel<T, int32_t>(x, axis, index, *out, true, dev_ctx);
+  } else if (index_type == DataType::INT64) {
+    funcs::cpu_gather_kernel<T, int64_t>(x, axis, index, *out, true, dev_ctx);
+  }
+}
+
+}  // namespace phi
+
+PD_REGISTER_KERNEL(take_along_axis,
+                   CPU,
+                   ALL_LAYOUT,
+                   phi::TakeAlongAxisKernel,
+                   float,
+                   double,
+                   int,
+                   int16_t,
+                   uint8_t,
+                   int64_t) {}