Accessor failed

1

auto srcdata = score.accessor<float,3>();

cout << srcdata[0][0][0] << endl;
for (int i = 0; i < srcdata.size(0); i++) {
	int max_index = 0;
	float max_value = -1000;
	for (int j = 0; j < srcdata.size(1); j++) {
		
		for (int k =0;k< srcdata.size(2);k++)
		{
			cout << "maxvalue:" << srcdata[i][j][k] << endl;
			if (srcdata[i][j][k] > max_value) {
				max_value = srcdata[i][j][k];
				max_index = k;
			}

		}

but i get nothing by srcdata[i][j][k]

2

What do you mean by “nothing”? Is the cout not printing anything?
This code snippet works for me:

from torch.utils import cpp_extension

cpp_source = """
torch::Tensor my_fun(torch::Tensor x){
    auto srcdata = x.accessor<float, 3>();
    for (int i = 0; i < srcdata.size(0); i++) {
        int max_index = 0;
        float max_value = -1000;
        for (int j = 0; j < srcdata.size(1); j++) {
            for (int k =0;k< srcdata.size(2);k++){
                std::cout << "srcdata[" << i << "][" << j << "][" << k << "]: " << srcdata[i][j][k] << std::endl;
                if (srcdata[i][j][k] > max_value) {
                    max_value = srcdata[i][j][k];
                    max_index = k;
                }
            }
        }
    }
    return x;
}
"""

module = torch.utils.cpp_extension.load_inline(
    name="test_extension",
    cpp_sources=cpp_source,
    functions="my_fun",
    verbose=True,
)

x = torch.randn(3, 3, 3)
out = module.my_fun(x)
print(out)
print('done')
3

when i execute ```
std::cout<<srcdata[i][j][k]<<endl:

i can not print nothing, why can you get the data in ```
srcdata and success get the value, is libtorch version?
4

Could you try to run my code and check, if you get valid outputs, please?
The code should be executable in your Python IDE.
I’m using the latest nightly binary.

5

t have tried,your code is right, it can get the value in ```
srcdata

6

std::vector<std::vector> crnn_deocdeMat(torch::Tensor score, std::vectorstd::string alphabetChinese) {

score = score.permute({1,0,2});
c10::IntList score_size = score.sizes();
cout << "score_size:" << score_size << endl;
//const float* srcdata = reinterpret_cast<const float *>(score.data_ptr());
auto srcdata = score.accessor<float,3>();
cout << ";;;;" << srcdata[0][0][0] << endl;

}
cout << “;;;;” << srcdata[0][0][0] << endl;this line print nothing,i dont know why,it si so strange