AttributeError: 'Tensor' object has no attribute 'coo'. Did you mean: 'cos'?

运行`./data/arxiv/sample_neighbor.py`脚本，报错如下：
```
Traceback (most recent call last):
File "C:\Program Files (x86)\PyCharm 2023.1.4\plugins\python\helpers\pydev\pydevd.py", line 1527, in _exec
pydev_imports.execfile(file, globals, locals) # execute the script
File "C:\Program Files (x86)\PyCharm 2023.1.4\plugins\python\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "E:\PythonProjects\GraphTranslator\data\arxiv\sample_neighbor.py", line 17, in
row = dataset[0].adj_t.coo()[0]
AttributeError: 'Tensor' object has no attribute 'coo'. Did you mean: 'cos'?
```
看这意思应该是稀疏矩阵转coo格式时函数调用出错，可否看看怎么改？谢谢。

Start with data/arxiv/sample_neighbor.py, especially line 17 where dataset[0].adj_t.coo() is called, and run the script to inspect the reported Tensor type. Check how this dataset exposes adjacency data and confirm the script completes without the AttributeError while producing the intended neighbor rows.

Written by the indexing model from the issue text.