16. One or more non-transitory computer-readable storage media storing instructions executable via the one or more processing devices to implement a caption generator configured to perform operations to automatically generate image captions using word vector representations including: 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 the caption generator to initiate caption generation; 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; and subsequently using the word vector in post-processing operations to generate a corresponding caption by: selecting a dictionary; and mapping the word vector to words in the semantic word vector space based on the selected dictionary.
16. One or more non-transitory computer-readable storage media storing instructions executable via the one or more processing devices to implement a caption generator configured to perform operations to automatically generate image captions using word vector representations including: 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 the caption generator to initiate caption generation; 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; and subsequently using the word vector in post-processing operations to generate a corresponding caption by: selecting a dictionary; and mapping the word vector to words in the semantic word vector space based on the selected dictionary. 17. One or more non-transitory computer-readable storage media as recited in claim 16 , wherein outputting the word vector in the semantic word vector space enables changing of the selected dictionary for different contexts.