-4 , -12 , and -109 are all disjoint speaker sets . ) ( Codes : SD=speaker dependent ( 2400 training sentences for RM2 ) , MS=multi-speaker , SI=speaker independent , -4=all 4 RM2 speakers combined , -12=all 12 RM1 SD speakers combined , -109=109 RM1 SI training speakers , SDG=SD Gaussians ,