Abstract: Systems and methods described herein can involve learning a functional neural network (FNN) for a source domain associated with source time series data, the learning involving learning functional parameters of the FNN, the FNN comprising a plurality of layers of continuous neurons; transferring the functional parameters of the FNN to a target domain that is separate from the source domain; and tuning the functional parameters of the FNN with target time series data from the target domain, the target time series data having fewer samples than the source time series data.