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Daniel Wagner's questions

Martin Hope
Daniel Wagner
Asked: 2024-09-23 08:27:43 +0800 CST
  • 6

使用 libtorch 时，以下代码片段会导致错误：

#include <iostream>
#include <torch/torch.h>
using namespace torch;
int main() {
    std::cout << zeros({}) << std::endl;
}

编译器抱怨：

% g++ -lc10 -ltorch -ltorch_cpu test.cpp -o test.x                                                       
test.cpp: In function ‘int main()’:
test.cpp:5:23: error: call of overloaded ‘zeros(<brace-enclosed initializer list>)’ is ambiguous
    5 |     std::cout << zeros({}) << std::endl;
      |                  ~~~~~^~~~
In file included from /opt/links/include/ATen/Functions.h:1334,
                 from /opt/links/include/ATen/ExpandUtils.h:4,
                 from /opt/links/include/torch/csrc/autograd/input_metadata.h:3,
                 from /opt/links/include/torch/csrc/autograd/function.h:7,
                 from /opt/links/include/torch/csrc/autograd/custom_function.h:7,
                 from /opt/links/include/torch/csrc/api/include/torch/autograd.h:5,
                 from /opt/links/include/torch/csrc/api/include/torch/all.h:7,
                 from /opt/links/include/torch/csrc/api/include/torch/torch.h:3,
                 from test.cpp:2:
/opt/links/include/ATen/ops/zeros.h:35:19: note: candidate: ‘at::Tensor at::zeros(IntArrayRef, c10::TensorOptions)’
   35 | inline at::Tensor zeros(at::IntArrayRef size, at::TensorOptions options={}) {
      |                   ^~~~~
In file included from /opt/links/include/torch/csrc/api/include/torch/types.h:7,
                 from /opt/links/include/torch/csrc/api/include/torch/data/dataloader_options.h:4,
                 from /opt/links/include/torch/csrc/api/include/torch/data/dataloader/base.h:3,
                 from /opt/links/include/torch/csrc/api/include/torch/data/dataloader/stateful.h:4,
                 from /opt/links/include/torch/csrc/api/include/torch/data/dataloader.h:3,
                 from /opt/links/include/torch/csrc/api/include/torch/data.h:3,
                 from /opt/links/include/torch/csrc/api/include/torch/all.h:9:
/opt/links/include/torch/csrc/autograd/generated/variable_factories.h:565:19: note: candidate: ‘at::Tensor torch::zeros(at::IntArrayRef, c10::TensorOptions)’
  565 | inline at::Tensor zeros(at::IntArrayRef size, at::TensorOptions options = {}) {
      |                   ^~~~~

为什么他at::zeros被列为候选人而我不是using namespace at？

关于此类错误还有许多其他问题，我认为它们无法回答我的问题：

  • 错误：尝试定义一个带有和不带有可选/默认参数的函数
    不相关，因为：两个变体都定义在同一个命名空间中
    问题：1 2
  • 错误：#include 了头文件的 C 版本，而不是 C++ 版本
    不相关，因为：据我所知，libtorch 没有 C 接口
    问题：1 2
  • 错误：在两个不同的命名空间中声明了相同的函数（非常接近！）
    不相关，因为：两个命名空间都已纳入范围，一个接using一个地现在位于该命名空间中，而在我看来，其中一个声明的候选者似乎不应该在我的范围内
    问题：1 2
  • 错误：所有可用的重载都没有正确的类型
    不相关，因为：两个候选都具有相同的类型，并且与调用相匹配；例如，更改zeros为torch::zeros可使文件编译
    问题：1 2 3

还有更多；我承认我此时感到很沮丧并放弃浏览它们。

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