💡 [REQUEST] - <title>The description of this chapter is not very suitable

[zjlamtt]

🚀 Describe the improvement or the new tutorial

beginner_source/nn_tutorial.py：
link
If you wish to process input images of arbitrary sizes, the preprocess function should not hardcode the shape of the input. Inputs can be dynamically resized and reshaped to accommodate different inputs.🙂

Existing tutorials on this topic

No response

Additional context

No response

cc @subramen @albanD