15. The method of claim 14 , wherein the one or more complete phonemes and/or one or more partial phonemes of a given viseme unit are provided as labels associated with the given viseme unit, wherein a label describing whether a phoneme that is adjacent to one or more complete phonemes is a partial phoneme that spans the beginning, middle, or end of the phoneme conveys a phoneme context of the one or more complete phonemes.
15. The method of claim 14 , wherein the one or more complete phonemes and/or one or more partial phonemes of a given viseme unit are provided as labels associated with the given viseme unit, wherein a label describing whether a phoneme that is adjacent to one or more complete phonemes is a partial phoneme that spans the beginning, middle, or end of the phoneme conveys a phoneme context of the one or more complete phonemes. 16. The method of claim 15 , wherein the labels are stored as metadata of the viseme units.