In the speaker-closed condition, two episodes were set aside from each speaker as development and test sets. Thereafter, the total sizes of the development and test sets turns out to be 1585 IPUs spanning 2 hours 23 minutes and 1841 IPUs spanning 2 hours and 48 minutes respectively. The ASR model is trained with the rest data. In the speaker-open condition, all the data except for the test speaker's were used for training As it would be difficult to train the model if all of the data of speaker KM or UT were removed, experiments using their speaker-open conditions were not conducted. 
 Question: What is the difference between speaker-open and speaker-closed setting?
In the speaker-closed condition, two episodes were set aside from each speaker as development and test sets. In the speaker-open condition, all the data except for the test speaker's were used for training