init.h

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/*
 * Copyright (c) 2022, NVIDIA CORPORATION.
 *
 * 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 <raft/util/cudart_utils.hpp>
 
#include <thrust/copy.h>
#include <thrust/device_ptr.h>
#include <thrust/execution_policy.h>
#include <thrust/iterator/counting_iterator.h>
 
namespace MLCommon {
namespace LinAlg {
 
namespace {
 
template <typename T>
void range(T* out, int start, int end, cudaStream_t stream)
{
  thrust::counting_iterator<int> first(start);
  thrust::counting_iterator<int> last = first + (end - start);
  thrust::device_ptr<T> ptr(out);
  thrust::copy(thrust::cuda::par.on(stream), first, last, ptr);
}
 
template <typename T, int TPB = 256>
void range(T* out, int n, cudaStream_t stream)
{
  range(out, 0, n, stream);
}
 
template <typename T>
void zero(T* out, int n, cudaStream_t stream)
{
  RAFT_CUDA_TRY(cudaMemsetAsync(static_cast<void*>(out), 0, n * sizeof(T), stream));
}
 
}  // unnamed namespace
}  // namespace LinAlg
}  // namespace MLCommon