Where to store dataset when creating neural network models and using github?
If the dataset isn't too large, you may add datasets on GitHub itself. Generally project datasets aren't large, but again, I can't be sure as you haven't mentioned any approximate size. But if it is large, you may refer to data source in your ReadMe or within your .py file as an external hyperlink.

For example, save dataset on Google Drive &amp; turn on Viewable option by generating shareable URL. Now that generated link can be refered to in your ReadMe file as something like: "Kindly refer this external link to access dataset". Alternatively, you may also read data directly within your .py file from that generated link, and any project reviewer would notice that external link being used to read dataset.

Hope that answers your query!