From this initial document set (hereafter referred to as WI-KICONTENT), we only retained languages that had more than 1000 documents (44 languages), and generated documents for WIKIPEDIAMULTI as follows: 1. randomly select the number of languages K (1≤K≤5) 2. randomly select a set of K languages S = {L i ∈L for i = 1• • •K} without replacement 3. randomly select a document for each L i ∈S from WIKICONTENT without replacement 4. take the top 1 K lines of the document 5. join the K sections into a single document.
of the procedure, the relative proportion of each language in a multilingual document tends not to be uniform, as it is conditioned on the length of the original document from which it was sourced, independent of the other K −1 for the other languages that it was combined with.