object name embedding

[GriffinLiang]

Hi, I am a little confused about the object embedding procedure. As mentioned in the paper, GloVe 100-d word embeddings are used as the object name embedding. However, some of the object names are not contained in the Glove embeddings. How to tackle these names? For example, 'american flag', "boy's arm", 'two suitcases', 'computer keyboard', 'larger horse', 'living room wall', 'navy blue shirt', 'of the aisle', 'hotdog bun', 'train station', 'skull picture', 'disney princess', 'neck tie'.

Thanks.