question about Matmul.apply() in file _linear_opeartor.py

[open2333]

Dear anyone who can help:
I am using c# to call a c++ program where I use python c API to call botorch, the same test question runs perfectly in c++, but in c#, the same question can only run 1 iteration, when it goes to iteration 2, it gets stuck at line 1728 file _linear_operator, it is still running without any error or warning message, I checked the forward function of Matmul and the return value res is right, I tried to debug to find the function, but after forward function return, the following process seems very complex, could you please help me with this? where can I find the Matmul.apply() function?

[open2333]

sorry, I found the reason, it is because I use async in c#.