Before revision:  The throughput in terms of processing training samples has been boosted by the use of the IPU in conjunction with grouped convolutions by a factor \sim 3.5 for training of the classifier and a factor of \sim 7 for the regression network.
After revision:  The throughput in terms of processing training samples has been boosted by the use of the IPU in conjunction with grouped convolutions by a factor ~ 3.5 for training of the classifier and a factor of \sim 7 for the regression network.