No, there's nothing wrong with hard question. And by hard I mean complicated code.
There is however something wrong with unclear questions, which is what your question was closed as ("unclear what you are asking"). While it is hard to review such questions, it is a different type of hard.
You can ask for a review about all kinds of neural networks, complicated implemented algorithms, over-engineered code, etc. as long as you explain the things a reviewer need. What is the code doing? What is class
xyz that is needed by parts of the code you posted? Answer such questions and you do not need to worry about the code being too hard to review.
See also Simon's guide for a good Code Review question