/
logspace_kernel.cu
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/
logspace_kernel.cu
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// 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/logspace_kernel.h"
#include "paddle/phi/backends/gpu/gpu_context.h"
#include "paddle/phi/core/kernel_registry.h"
#include "paddle/phi/kernels/copy_kernel.h"
#include "paddle/phi/kernels/funcs/data_type_transform.h"
#include "paddle/phi/kernels/funcs/math_function.h"
namespace phi {
template <typename T>
__global__ void LogspaceKernelInner(
T start, T stop, double step, T base, int64_t size, T* out) {
int64_t index = blockIdx.x * blockDim.x + threadIdx.x;
for (; index < size; index += blockDim.x * gridDim.x) {
if (index < size / 2) {
out[index] =
static_cast<T>(pow(static_cast<double>(base),
static_cast<double>(start + step * index)));
} else {
out[index] = static_cast<T>(
pow(static_cast<double>(base),
static_cast<double>(stop - step * (size - index - 1))));
}
}
}
template <typename T>
__global__ void LogspaceSpecialKernel(T start, T base, T* out) {
out[0] = static_cast<T>(
pow(static_cast<double>(base), static_cast<double>(start)));
}
template <typename T, typename Context>
void LogspaceKernel(const Context& ctx,
const DenseTensor& start,
const DenseTensor& stop,
const DenseTensor& number,
const DenseTensor& base,
DataType dtype,
DenseTensor* out) {
auto start_t = phi::funcs::TransDataType(ctx, start, dtype);
auto stop_t = phi::funcs::TransDataType(ctx, stop, dtype);
auto base_t = phi::funcs::TransDataType(ctx, base, dtype);
DenseTensor n_start;
DenseTensor n_stop;
DenseTensor n_num;
DenseTensor n_base;
phi::Copy(ctx, start_t, phi::CPUPlace(), false, &n_start);
T start_data = n_start.data<T>()[0];
phi::Copy(ctx, stop_t, phi::CPUPlace(), false, &n_stop);
T stop_data = n_stop.data<T>()[0];
phi::Copy(ctx, number, phi::CPUPlace(), false, &n_num);
int64_t num = static_cast<int64_t>(n_num.data<int32_t>()[0]);
phi::Copy(ctx, base_t, phi::CPUPlace(), false, &n_base);
T base_data = n_base.data<T>()[0];
PADDLE_ENFORCE_GT(
num,
0,
phi::errors::InvalidArgument("The num of logspace op should be larger "
"than 0, but received num is %d",
num));
out->Resize(phi::make_ddim({num}));
T* out_data = ctx.template Alloc<T>(out);
double step = 0;
auto stream = ctx.stream();
int block = 512;
int grid = (num + block - 1) / block;
if (num != 1) {
step = (static_cast<double>(stop_data - start_data)) / (num - 1);
LogspaceKernelInner<T><<<grid, block, 0, stream>>>(
start_data, stop_data, step, base_data, num, out_data);
} else {
LogspaceSpecialKernel<T><<<grid, block, 0, stream>>>(
start_data, base_data, out_data);
}
}
} // namespace phi
PD_REGISTER_KERNEL(logspace,
GPU,
ALL_LAYOUT,
phi::LogspaceKernel,
float,
int32_t,
int64_t,
double) {}