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README.md

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 This is an updated version of [cointegrated/rubert-tiny](https://huggingface.co/cointegrated/rubert-tiny): a small Russian BERT-based encoder with high-quality sentence embeddings. 
 
+**DISCLAIMER: the model is going to be updated, and the current version is unstable.**
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 The differences from the previous version include:
 - a larger vocabulary: 83828 tokens instead of 29564;
 - larger supported sequences: 2048 instead of 512;