Russian Social Media Text Classification

VKontakte communities can belong to one of several predefined categories. But even among the sports communities there is a fairly strong division by subject! The same authors can write about only one sport or at once about a large number.
Based on a given set of posts, determine the topic - what kind of sport is being discussed in the selected community?

Here is a list of available categories:

1. athletics,
2. autosport,
3. basketball,
4. boardgames,
5. esport,
6. extreme,
7. football,
8. hockey,
9. martial arts,
10. motosport,
11. tennis,
12. volleyball,
13. winter_sport

evaluate metric look like:

def score(true, pred, n_samples):
    counter = 0
    if true == pred:
        counter += 1
    else:
        counter -= 1
    return counter / n_samples