Using item data in a recommender

User 5152 | 4/26/2016, 8:40:57 AM

Reading itemdata, how can I specify in the columntypehints that I have an array and the type of array members, e.x. float or strings? How these arrays are involved in the computation of the latent factors? What is the difference between using an array of values and using two columns, one for the itemid and the other one for the features <itemid, featureid>? It seems that the system takes into account order also in this second case (according to substantial differences in results). Shouldn't be somehow independent of the writing order of the feature column?

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