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First provide a summary of the paper, and then address the following criteria: Quality, clarity, originality and significance. This paper defines a joint generative model of an image and its annotated text which is used to learn a bit vector representation for large scale image retrieval. An Indian Buffet Process is used to learn the length of the bit vector. The method is compared favourably to several widely used techniques. Quality ======= It is good to see a retrieval paper constructed around a well-defined probabilistic model.