8. A method comprising: obtaining, at a computing device, a first set of feature vectors, wherein the first set of feature vectors correspond to a first unit of input speech; comparing characteristics of the first set of feature vectors to a first gender-specific speech model and a second gender-specific speech model; determining that the characteristics of the first set of feature vectors fit the first gender-specific speech model better than the second gender-specific model; obtaining a second set of feature vectors, wherein the second set of feature vectors correspond to a second unit of input speech; modifying the second set of feature vectors based on a first gender-specific speaker adaptation technique associated with the first gender-specific speech model; after modifying the second set of feature vectors, comparing characteristics of the second set of feature vectors to the first gender-specific speech model, the second gender-specific speech model, and a speaker-dependent speech model; determining that the characteristics of the second set of feature vectors fit the speaker-dependent speech model better than the first and second gender-specific models; obtaining a third set of feature vectors, wherein the third set of feature vectors correspond to a third unit of input speech; and modifying the third set of feature vectors based on a speaker-dependent speaker adaptation technique associated with the speaker-dependent speech model.
8. A method comprising: obtaining, at a computing device, a first set of feature vectors, wherein the first set of feature vectors correspond to a first unit of input speech; comparing characteristics of the first set of feature vectors to a first gender-specific speech model and a second gender-specific speech model; determining that the characteristics of the first set of feature vectors fit the first gender-specific speech model better than the second gender-specific model; obtaining a second set of feature vectors, wherein the second set of feature vectors correspond to a second unit of input speech; modifying the second set of feature vectors based on a first gender-specific speaker adaptation technique associated with the first gender-specific speech model; after modifying the second set of feature vectors, comparing characteristics of the second set of feature vectors to the first gender-specific speech model, the second gender-specific speech model, and a speaker-dependent speech model; determining that the characteristics of the second set of feature vectors fit the speaker-dependent speech model better than the first and second gender-specific models; obtaining a third set of feature vectors, wherein the third set of feature vectors correspond to a third unit of input speech; and modifying the third set of feature vectors based on a speaker-dependent speaker adaptation technique associated with the speaker-dependent speech model. 10. The method of claim 8 , wherein modifying the second set of feature vectors based on the first gender-specific speaker adaptation technique comprises applying a first gender-specific transform to feature vectors in the second set of feature vectors, wherein the first gender-specific transform is associated with the first gender-specific speaker adaptation technique, wherein modifying the third set of feature vectors based on the speaker-dependent speaker adaptation technique comprises applying a speaker-dependent transform to feature vectors in the third set of feature vectors, wherein the speaker-dependent transform is associated with the speaker-dependent speaker adaptation technique.