transformers pytorch tf jax rust t5 text2text-generation summarization translation en fr ro de multilingual dataset:c4 arxiv:1805.12471 arxiv:1708.00055 arxiv:1704.05426 arxiv:1606.05250 arxiv:1808.09121 arxiv:1810.12885 arxiv:1905.10044 arxiv:1910.09700 license:apache-2.0 autotrain_compatible text-generation-inference endpoints_compatible region:us