  Model pre-training is a cornerstone of modern visual recognition systems.
Although fully supervised pre-training on datasets like ImageNet is still the
de-facto standard, recent studies suggest that large-scale weakly supervised
pre-training can outperform fully supervised approaches. This paper revisits
weakly-supervised pre-training of models using hashtag supervision with modern
versions of residual networks and the largest-ever dataset of images and
corresponding hashtags. We study the performance of the resulting models in
various transfer-learning settings including zero-shot transfer. We also
compare our models with those obtained via large-scale self-supervised
learning. We find our weakly-supervised models to be very competitive across
all settings, and find they substantially outperform their self-supervised
counterparts. We also include an investigation into whether our models learned
potentially troubling associations or stereotypes. Overall, our results provide
a compelling argument for the use of weakly supervised learning in the
development of visual recognition systems. Our models, Supervised Weakly
through hashtAGs (SWAG), are available publicly.
