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

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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.

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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.

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Okay, thanks for the information.

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