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Revisiting the Importance of Individual Units in CNNs via Ablation

arXiv.org Artificial Intelligence

We revisit the importance of the individual units in Convolutional Neural Networks (CNNs) for visual recognition. By conducting unit ablation experiments on CNNs trained on large scale image datasets, we demonstrate that, though ablating any individual unit does not hurt overall classification accuracy, it does lead to significant damage on the accuracy of specific classes. This result shows that an individual unit is specialized to encode information relevant to a subset of classes. We compute the correlation between the accuracy drop under unit ablation and various attributes of an individual unit such as class selectivity and weight L1 norm. We confirm that unit attributes such as class selectivity are a poor predictor for impact on overall accuracy as found previously in recent work \cite{morcos2018importance}. However, our results show that class selectivity along with other attributes are good predictors of the importance of one unit to individual classes. We evaluate the impact of random rotation, batch normalization, and dropout to the importance of units to specific classes. Our results show that units with high selectivity play an important role in network classification power at the individual class level. Understanding and interpreting the behavior of these units is necessary and meaningful.


Mike Watt to release album of 1995 live gig featuring a backing band of Eddie Vedder, Dave Grohl, Pat Smear and others

Los Angeles Times

Columbia-Legacy has announced the release of a crucial Southland document that captures a snapshot moment when bassist Mike Watt, co-founder of influential San Pedro band Minutemen, went on the road with members of Foo Fighters, Pearl Jam, the Germs and others in support of Watt's first solo album, "Ball Hog or Tugboat?" Called "ring spiel tour '95," the album captures a gig at Chicago's Cabaret Metro that featured Watt and a backing band consisting of musicians from opening acts Foo Fighters and Hovercraft. Specifically, playing with Watt were Eddie Vedder (Pearl Jam, Hovercraft), Dave Grohl (Foo Fighters, Nirvana), Pat Smear (Foo Fighters, Germs) and William Goldsmith (Sunny Day Real Estate, Foo Fighters). For Grohl, the tour was his first since the suicide of Nirvana bandmate Kurt Cobain. The forthcoming archival release will arrive on Nov. 11 as a double LP, CD or digital download. Among its 50-plus collaborators were future or current members of Bikini Kill, Beastie Boys, Nirvana, the Pixies, Swell Maps, Pearl Jam, Meat Puppets, Black Flag, Queens of the Stone Age, Wilco (guitarist Nels Cline) and Sonic Youth.