chore: import upstream snapshot with attribution

paddle/phi/kernels/cpu/eig_grad_kernel.cc

@@ -0,0 +1,53 @@
+// 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/eig_grad_kernel.h"
+#include "paddle/phi/kernels/cpu/eig.h"
+
+#include "paddle/phi/core/kernel_registry.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void EigGradKernel(const Context& dev_ctx,
+                   const DenseTensor& out_w,
+                   const DenseTensor& out_v,
+                   const optional<DenseTensor>& dout_w,
+                   const optional<DenseTensor>& dout_v,
+                   DenseTensor* dx) {
+  auto* dx_data = dev_ctx.template Alloc<dtype::Complex<T>>(dx);
+  if (dx->numel() == 0) {
+    return;
+  }
+  int batch_count = BatchCount(out_v);
+  const int order = static_cast<int>(out_v.dims(-1));
+
+  ComputeBackwardForComplexInput<dtype::Complex<T>, Context>(
+      out_w, out_v, dout_w, dout_v, dx_data, batch_count, order, dev_ctx);
+}
+
+}  // namespace phi
+
+PD_REGISTER_KERNEL(eig_grad,
+                   CPU,
+                   ALL_LAYOUT,
+                   phi::EigGradKernel,
+                   float,
+                   double,
+                   phi::complex64,
+                   phi::complex128) {
+  kernel->InputAt(0).SetDataType(phi::dtype::ToReal(kernel_key.dtype()));
+  kernel->InputAt(2).SetDataType(phi::dtype::ToReal(kernel_key.dtype()));
+  kernel->OutputAt(0).SetDataType(phi::dtype::ToComplex(kernel_key.dtype()));
+}