Jan-2019: ImageNet server is under maintenance. Synsets outside ILSVRC are temporarily unavailable. Oct-2019: Due to scheduled maintenance, ILSVRC downloads are temporarily unavailable.

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We use the Popularity Percentile index to measure the popularity of a synset. A 90% Popularity Percentile indicates that the synset is ranked higher in popularity than 90% of all synets. The ranking is derived by combining the number of results returned by Google text search and the word frequency in the British National Corpus.