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Karan Grewal

Alumni

Publications

Learning deep representations by mutual information estimation and maximization
(Rex) Devon Hjelm
Alex Fedorov
Samuel Lavoie-Marchildon
Karan Grewal
Adam Trischler
Phil Bachman
Yoshua Bengio
This work investigates unsupervised learning of representations by maximizing mutual information between an input and the output of a deep n… (voir plus)eural network encoder. Importantly, we show that structure matters: incorporating knowledge about locality in the input into the objective can significantly improve a representation’s suitability for downstream tasks. We further control characteristics of the representation by matching to a prior distribution adversarially. Our method, which we call Deep InfoMax (DIM), outperforms a number of popular unsupervised learning methods and compares favorably with fully-supervised learning on several classification tasks in with some standard architectures. DIM opens new avenues for unsupervised learning of representations and is an important step towards flexible formulations of representation learning objectives for specific end-goals.
2019-01-01
ICLR (publié)
openreview.net
openreview.net