http://knowledgedefinednetworking.org/
Associated paper: https://arxiv.org/abs/1606.06222
There are data-sets that are intended to be used to learn the relation between routing, traffic and network performance (delay).
In addition there are data-sets for VNF modeling.
Finally, feel free to publish there any ML-related dataset, it is indeed a key aspect for ML research.
WIDE project also provides traffic datasets (anonymized pcap): http://mawi.wide.ad.jp/mawi/
BGP routing table archives are also publicly available for Internet topology/BGP research: http://routeviews.org https://www.ripe.net/analyse/internet-measurements/routing-information-service-ris/ris-raw-data
http://crawdad.org https://www.caida.org/data/ http://imdc.datcat.org/Home