1. In a digital media environment to facilitate management of image collections using one or more computing devices, a method to automatically generate image captions using word vector representations comprising: obtaining a target image for caption analysis; applying feature extraction to the target image to generate attributes corresponding to the image; supplying the attributes to a caption generator to initiate caption generation; and outputting by the caption generator a word vector in a semantic word vector space indicative of semantic relationships between words in sentences formed as a combination of the attributes, the word vector usable to generate a corresponding caption.