Five Certified Deaf Interpreters (CDIs) translate sentences from the FLORES/FLEURS corpus into ASL on video, so each recording has ready-made text and speech references in many languages. For sentence-level scoring, two metrics are recommended: BLEU (sacreBLEU with "intl" tokenization) and BLEURT (the BLEURT-20 model); at the discourse level only BLEU is used (BLEURT is not intended for long outputs), and for timed translation, Timed BLEU (and by extension Timed BLEURT). The baseline model follows the YouTube-ASL approach: a T5v1.1-Base encoder-decoder into which 85 3D MediaPipe Holistic skeleton landmarks are linearly projected, with a 34-second context window and timestamp and previous-text tokens. The benchmark covers sentence- and discourse-level translation, caption alignment, retrieval, and multiple-choice receptive comprehension tasks.
Sign language translation has historically been peripheral to mainstream machine translation research, and there was no standardized, multilingual benchmark that included a sign language. FLEURS-ASL provides a comparable point of reference to rigorously measure the ability of models (including multimodal models) to understand and translate ASL.
1,749 sentences across 495 discourses (7.49 h of video) recorded by 5 Certified Deaf Interpreters (CDIs).
Sentences come from FLORES/FLEURS, so ASL translations are aligned with text in 200 languages and speech in 102 languages.
Sentence- and discourse-level translation, caption alignment, retrieval, and multiple-choice receptive comprehension.
BLEU (sacreBLEU, "intl" tokenization) and BLEURT (BLEURT-20) at sentence level; BLEU only at discourse level; Timed BLEU/BLEURT for timed translation.
T5v1.1-Base encoder-decoder with linearly projected 85 3D MediaPipe Holistic landmarks, a 34-second context window, and timestamp and previous-text tokens; trained on YouTube-ASL.
The author notes BLEURT is not intended for long outputs, so at the discourse level only BLEU should be reported.
Multilingual machine translation benchmark (101 languages) providing the text reference basis.
Speech extension of FLORES: Few-shot Learning Evaluation of Universal Representations of Speech (Google).
Large-scale, open-domain ASL–English corpus (~1000 h), the basis for the FLEURS-ASL baseline model.
Introduces ASL into massively multilingual evaluation; reveals that frontier multimodal models do not understand ASL.
