meooow25 / carrot Goto Github PK

I tried to reload for several minutes just to make sure if it wasn't working and yes, this was what looked like after that.

To start, I want to say thank you for this amazing extension!!

But for some reason I am not getting predictions for today's contest. Can somebody tell me the reason or point me towards an explaination as to why predictions are not showing up for today's contest?

p.s. my profile is https://codeforces.com/profile/creamyCockroach

Carrot uses some arrows from the Miscellaneous Symbols and Arrows Unicode block.
These are currently ⮭, ⭜ and ⭝.
If you do not see three arrows above, your browser could not display them properly.

Windows users should already have the font Segoe UI Symbol, which can display these characters. On other platforms, if the arrows are not shown properly consider installing a font which can display them. I'm told a font called Symbola works, it's free for personal, non-commercial use, available here.

Carrot shows N/A for finished contests after you've changed your handle.

the error is here and the extension is not working any more
console.error('[Carrot] Predict error: %o', er);

fix please

Hey,

I have observed that this extension is showing rating performance as infinity for rank 1. I don't think it should be that, maybe there are some off by one errors in the code?

It displays performance and final rating changes after the contest has finished, but not predicted deltas before rating changes are out.

I turned off all the options during a contest and now I can't turn them on again, since they don't appear. I tried removing and installing the extension again but it didn't work.

Currently hard because of the number of API calls it would need (2 x number of contests).
Might be doable with some caching.

I know that the extension has not been updated for a long time, but still.
I think it's a good idea to add the user's performance to each round in the rating graph

Codeforces has added an includeRetired param to user.ratedList (quite some time ago) with an undocumented default of true. This means that any user who hasn't been online in the last month but participates in a contest after Carrot has cached ratings (which within 1hr of a contest start by default) will appear to Carrot as a new user.

It's understandable that they might want to add a filter since the number of users on CF has grown rapidly and every request would a huge amount of data if all users were returned. I wish they wouldn't change things silently without any announcement or changelog, but that's a different matter.

I do not want to set includeRetired to true in Carrot because, as mentioned, it would be a huge amount of data. But keeping it false means worse predictions (perfect prediction is impossible due to fake ratings anyway).

An endpoint that can used instead of user.ratedList is user.info. It can be argued to be more suitable for this use case than user.ratedList. When this extension was written, however, it was unusable. But CF has added support for POST requests so it is usable now. This would mean more number of requests as opposed to one large request upfront. But it would only be the user info of the participants, so amount of data should be smaller.

Hello! Extremely helpful extension. You have my utmost appreciation for it.

Currently, the extension shows performance ratings only for the official contestants. I was wondering if it would be possible to include the unofficial contestants too during the performance rating calculation. It'll be very useful for the higher-rated contestants participating in Div2 rounds for practice to have an estimation of their performance.

My guess about the reason why it's not already included in the extension yet is that there's no way to distinguish between the unofficial contestants from the virtual contestants in Codeforces API. This surely is a problem, and there seems to be no easy workaround for it. But at least for the higher-rated contestants who participate in a contest on time as it happens, being able to view the combined performance rating in real-time or shortly after the contest ends could still be perfectly useful. So maybe there could be an option to view the combined performance ratings (for the higher-rated contestants) or only the official performance ratings?

Looking forward to learning your thoughts on this. Thanks!

This Unicode escape character doesn't work on my local. Maybe change it? Also in that entire section adding words to explain what the symbols mean might be helpful.

Carrot adds 3 columns and people may not want them all.

The Codeforces API is often down and the extension stops working, but for a user there is no clue why it stopped working apart from a cryptic message in the console.
There should probably be better messaging about what failed and why.

Related: #39, #42

I do not know about live prediction calculations but at least for performance calculations after the contest is done, unrated users count as having rating 0 instead of the default rating of 1400.

I believe this is because the ratingChange api response returns rating 0 but the default rating is only used if the rating is null.

One possible fix would be to also use default rating if the rating is zero. There may be some false positives who actually have rating zero but they should be negligible, as there currently is no active user who has that rating. I tested this and it seems more accurate than before.

Add explanation of these on chrome store.