A body part index may be a discrete value or {HEAD ~ a probability distribution} indicating the likelihood that a pixel belongs to {TAIL ~ two or more different body parts} 
A body part index may be a discrete value or { HEAD ~ a probability distribution } indicating the likelihood that a pixel belongs to { TAIL ~ two or more different body parts }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL