Listen, Attend, Spell and Adapt: Speaker Adapted Sequence-to-Sequence ASR
Table 3: WER [%] and WERR [%] compared to the SI model using mWER + KLD (8) by amount of data and regularization strength (β).
['# Data', '[ITALIC] β', 'WER', 'WERR']
We found some inconsistencies in the formatting of the adaptation vs. the evaluation data, to which the mWER adaptation was particularly sensitive. Using the cleaned data, the standard KLD criterion achieves 8.70 % WER with 2 h data, while we obtain 8.10 % WER from the mWER + KLD criterion. With stronger regularization (β=0.8), the WER is slightly higher, but the improvement is more uniform (no degradations for any speaker). Increasing the adaptation data to 20 h, we obtain 7.33 % WER, which is a 3.2 % relative improvement compared to KLD (7.57 % WER).