CMU's IWSLT 2024 Simultaneous Speech Translation System
This is an incremental improvement for real-time speech translation systems, addressing the need for low-latency translation in applications like live captioning.
The paper tackles simultaneous speech translation from English to German by integrating a speech encoder, modality adapter, and Llama2 decoder, achieving a BLEU score of 29.5 under 2 seconds latency.
This paper describes CMU's submission to the IWSLT 2024 Simultaneous Speech Translation (SST) task for translating English speech to German text in a streaming manner. Our end-to-end speech-to-text (ST) system integrates the WavLM speech encoder, a modality adapter, and the Llama2-7B-Base model as the decoder. We employ a two-stage training approach: initially, we align the representations of speech and text, followed by full fine-tuning. Both stages are trained on MuST-c v2 data with cross-entropy loss. We adapt our offline ST model for SST using a simple fixed hold-n policy. Experiments show that our model obtains an offline BLEU score of 31.1 and a BLEU score of 29.5 under 2 seconds latency on the MuST-C-v2 tst-COMMON.