Rnn Complex numbers

Hi,
I have encountered a new challenge kaggle type.
The dataset consists of signals recorded by ground doppler-pulse radars.
The tracks in the dataset are split into 32 time-unit segments. A segment consists of a matrix with I/Q values and Metadata.
Link for the contest
https://competitions.codalab.org/competitions/25389

Do we have a RNN that deals with complex numbers? Does someone was required to build a Neural networks dealing with this type of data?
Thanks