What do the arrows next to code completion hints signify?
In the screenshot, there are a number of up/down arrows with numbers next to them but, since I don't know what they are called, I don't know how to find the documentation about what they are and how to best utilize them.
Can anyone help me out? 
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This is ML completion and the numbers indicate ranking changes by the algorithm
More info: https://www.jetbrains.com/help/pycharm/auto-completing-code.html#ml_completion
Cool. Is the ML trained locally, or does it utilize data from JetBrains users who allow data to be sent back? And are the rankings suggested based on best-guess of what the user might want next?
Just curious how it determines the rankings.
It's working locally and learning from your behavior.
>And are the rankings suggested based on best-guess of what the user might want next?
Exactly.
There's not much info as the feature is still experimental, but we'll be updating our docs eventually.
Okay, thanks for the information.