I am getting the error

‘is_available’: is not a member of 'at::cuda

when compiling the following code:
int main(int argc, const char* argv[]) {
	//if (argc != 2) {
	//	std::cerr << "usage: example-app <path-to-exported-script-module>\n";
	//	return -1;
	//}

	torch::Device device = torch::kCPU;
	if (torch::cuda::is_available()) {
		std::cout << "CUDA is available! Training on GPU." << std::endl;
		device = torch::kCUDA;
	}

	argv[1] = "C:/Users/gjben/Documents/PytorchCPP/torch_example/x64/Release/model.pt";
	// Deserialize the ScriptModule from a file using torch::jit::load().
	std::shared_ptr<torch::jit::script::Module> module = torch::jit::load(argv[1]);

	assert(module != nullptr);
	std::cout << "ok\n";

	// Create a vector of inputs.
	std::vector<torch::jit::IValue> inputs;
	inputs.push_back(torch::ones({ 1, 3, 224, 224 }));

	auto begin = std::chrono::high_resolution_clock::now();
	// Execute the model and turn its output into a tensor.
	auto output = module->forward(inputs).toTensor();
	auto end = std::chrono::high_resolution_clock::now();
	std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - begin).count() << " ms" << std::endl;

	std::cout << output.slice(/*dim=*/1, /*start=*/0, /*end=*/5) << '\n';

Interestingly, if I use python I can allocate tensors to cuda.
I have tested with the following code, and Nvidia-smi reports the usage of my GPU without problems.
import torch
a = torch.rand(20000,20000).cuda()
while True:
	a += 1
	a -= 1

Is this a problem of LibTorch??
Should I reinstall pytorch manually setting TORCH_CUDA_ARCH_LIST??
I have installed pytroch from source (using ninja) and here is my environment:
PyTorch version: 1.2.0a0+f2623c7
Is debug build: No
CUDA used to build PyTorch: 10.0

OS: Microsoft Windows 10 Home
GCC version: (tdm64-1) 5.1.0
Visual Studio version: 2017 v15.9.12
CMake version: version 3.14.5

Python version: 3.6
Is CUDA available: Yes
CUDA runtime version: 10.0.130
GPU models and configuration: GPU 0: GeForce GTX 1070
Nvidia driver version: 425.25
cuDNN version: C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.0\bin\cudnn64_7.dll

Versions of relevant libraries:
[pip] numpy==1.12.1
[pip] numpydoc==0.6.0
[pip] torch==1.2.0a0+f2623c7
[conda] mkl                       2019.0                    <pip>
[conda] mkl                       2017.0.1                      0
[conda] mkl-include               2019.0                    <pip>
[conda] mkl-service               1.1.2                    py36_3
[conda] torch                     1.2.0a0+f2623c7           <pip>