Pipreqs tries to give me a library not installed on my system

I deleted my requirements.txt file just to make sure that a new file was created. I run `pipreqs .` I get the following

bokeh==2.4.2
dm_sonnet==2.0.0
matplotlib==3.1.2
numpy==1.19.5
pandas==1.3.5
pyproj==3.1.0
sonnet==0.1.6
tensorflow==2.6.0
tensorflow_probability==0.13.0
tqdm==4.62.3

I do have dm_sonnet installed but not sonnet. I am wondering why and how sonnet got picked up. When I do a pip freeze, it is not there

Start by reproducing the issue with `pipreqs .` and compare the generated requirements.txt with `pip freeze`. Trace how the tool maps the reported `dm_sonnet` import to package names. Done means the generated file includes the installed dependency without adding the uninstalled `sonnet` package.

Written by the indexing model from the issue text.