Suggestion to clean up redundant module names in Brainpy

[CloudyDory]

Hi, thanks for your time and effort in developing Brainpy. It's a great tool to use.

However, when reading the brainpy examples, I found different tutorial files use different module names, which actually refer to the same underlying module, and this can easily confuse newcomers when learning Brainpy.

For example:

• In "Implementation 1" of ei_nets/Brette_2007_COBAHH.ipynb, the neurons are inherited from bp.NeuGroup.
• In "Old version" of ei_nets/Tian_2020_EI_net_for_fast_response.ipynb, the neurons are inherited from bp.dyn.NeuDyn.
• In "Customizing Your Neuron Models", we can also construct neuron models by inheriting from bp.dyn.NeuGroup.

And actually, bp.NeuGroup, bp.dyn.NeuDyn, and bp.dyn.NeuGroup all refer to brainpy._src.dyn.base.NeuDyn, so if I understand correctly, the three are completely the same. If this is true, I suggest keeping only one and using it consistently throughout the tutorials.

Another example is bp.Network and bp.DynSysGroup, which both refer to brainpy._src.dynsys.DynSysGroup. The two names look very different, so I also suggest to keep only one.

[chaoming0625]

Thanks for raising this question. This is indeed a problem. However, we have always been busy. I hope there are contributors who can help us fix and improve these issues.

[ztqakita]

Great suggestion! I will clean up the example docs to the latest version as soon as possible.