Compositional Generalization in Image Captioning
Table 8: Comparison of bounding box sizes for different concept pairs describing sizes of objects. The last column indicates the resulting p-value from an unpaired t-test between the data of the two respective rows.
['Concept', 'Average bounding box size (in pixels)', 'Number of samples', 'p-Value']
Further, the last column shows the resulting p-values from the t-tests. The differences in box sizes for small vs. big objects are never significant, except for the case of table (p ≈ 0.007). However, in this case the box sizes are on average bigger if the table is described as small. We conclude that the bounding box sizes of objects in the COCO dataset do not relate to the described sizes in the respective captions.