I am using PyCharm and encountered an error at the line
import pytorch_lightning as pl
because the package pytorch_lightning had not been added to my Python interpreter. I used PyCharm to search for the package but it was unable to find it. However, searching the internet, I did come across references to a package called Pytorch Lightning. As a result, I decided to see if PyCharm could locate a package called lightning, and indeed it was able to. After adding this package to the interpreter, the error disappeared.
I have also seen others use the line import pytorch-lightning as pl, with a hyphen instead of an underscore.
Are there multiple packages with very similar names in existence or is pytorch_lightning the same as pytorch-lighning and the same as lightning?
Why did my error go away?
there is only one package. it however maintains aliases that can be used interchangeably. the underscore name is preferred.