cherry pick to release/1.7

[cjt222]

add data_loader for rrpn and cherry pick to release/1.7

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}