title: The NiuTrans End-to-End Speech Translation System for IWSLT 2021 Offline Task
abstract: This paper describes the submission of the Ni-uTrans end-to-end speech translation system for the IWSLT 2021 offline task, which translates from the English audio to German text directly without intermediate transcription. We use the Transformer-based model architecture and enhance it by Conformer, relative position encoding, and stacked acoustic and textual encoding. To augment the training data, the English transcriptions are translated to German translations. Finally, we employ ensemble decod