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I've imported the wikipedia database in four languages with the goal of running some machine learning algorithms on it for text classification. The import doesn't populate the "category" table though. Am I missing something?

I would also like to know if there was a way to map categories across the different language databases? i.e. know which category in English represents which category in German for example?

Thanks!

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    It turns out I imported the articles only (using mwdumper). The categories (as well as the pages) and other table dumps can be downloaded here: dumps.wikimedia.org/enwiki/latest. "en" can be replaced with the desired language code.
    – podzway
    Mar 8, 2016 at 11:05

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For the second question, the answer is in the langlinks table (categories have page_id just like pages). Se more here: https://www.mediawiki.org/wiki/Manual:Langlinks_table

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  • Anyway beware that structure of categories is different in different Wikipedias and this makes mapping categories between Wikipedias harder than mapping articles.
    – Pere
    Mar 4, 2017 at 17:23

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