bmm_kernel_impl.h

// 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/bmm_kernel.h"

#include "paddle/phi/kernels/funcs/blas/blas.h"

namespace phi {

template <typename T, typename Context>
void BmmKernel(const Context& dev_ctx,
               const DenseTensor& x,
               const DenseTensor& y,
               DenseTensor* out) {
  dev_ctx.template Alloc<T>(out);

  if (x.numel() == 0 || y.numel() == 0) {
    return;
  }

  auto blas = phi::funcs::GetBlas<Context, T>(dev_ctx);

  auto mat_dim_a = phi::funcs::CreateMatrixDescriptor(x.dims(), 0, false);
  auto mat_dim_b = phi::funcs::CreateMatrixDescriptor(y.dims(), 0, false);

  blas.MatMul(x, mat_dim_a, y, mat_dim_b, T(1), out, T(0));
}

}  // namespace phi