33. The computer readable non-transitory storage medium of claim 31 , determining a shared library further comprising: determining a first set of coefficients for use with the shared dictionary in approximating the plurality of feature descriptor values of each unit of the plurality of units of the first media content item; determining a second set of coefficients for use with the shared dictionary in approximating the plurality of feature descriptor values of each second media content item of the plurality of second media content items of the auxiliary data; and determining third and fourth sets of coefficients, the third set of coefficients for use with the plurality of feature descriptor values of each unit of the plurality of units and the fourth set of coefficients for use with the plurality of feature descriptor values of each second media content item of the plurality of second media content items of auxiliary data in approximating the shared dictionary.
33. The computer readable non-transitory storage medium of claim 31 , determining a shared library further comprising: determining a first set of coefficients for use with the shared dictionary in approximating the plurality of feature descriptor values of each unit of the plurality of units of the first media content item; determining a second set of coefficients for use with the shared dictionary in approximating the plurality of feature descriptor values of each second media content item of the plurality of second media content items of the auxiliary data; and determining third and fourth sets of coefficients, the third set of coefficients for use with the plurality of feature descriptor values of each unit of the plurality of units and the fourth set of coefficients for use with the plurality of feature descriptor values of each second media content item of the plurality of second media content items of auxiliary data in approximating the shared dictionary. 34. The computer readable non-transitory storage medium of claim 33 , scoring the plurality of segments of the media content item further comprising: scoring each unit of the plurality of units of the first media content item, the scoring comprising determining a unit-level score for each unit representing the unit's measure of similarity to the first media content item's descriptive information using a plurality of coefficients from the first and third sets of coefficients.