chore: import upstream snapshot with attribution

paddle/phi/kernels/impl/frobenius_norm_kernel_impl.h

@@ -0,0 +1,40 @@
+// 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/kernels/cpu/reduce.h"
+#include "paddle/phi/kernels/frobenius_norm_kernel.h"
+#include "paddle/phi/kernels/funcs/reduce_functor.h"
+
+namespace phi {
+
+template <typename T, typename Context>
+void FrobeniusNormKernel(const Context& dev_ctx,
+                         const DenseTensor& x,
+                         const IntArray& axis,
+                         bool keep_dim,
+                         bool reduce_all,
+                         DenseTensor* out) {
+  if (x.numel() == 0) {
+    dev_ctx.template Alloc<T>(out);
+    funcs::SetConstant<Context, T>()(dev_ctx, out, 0);
+    return;
+  }
+  reduce_all = recompute_reduce_all(x, axis.GetData(), reduce_all);
+  Reduce<Context, T, funcs::FrobeniusNormFunctor>(
+      dev_ctx, x, reduce_all, axis.GetData(), keep_dim, x.dtype(), out);
+}
+
+}  // namespace phi