Models were evaluated and ranked based on their ability to predict the unseen DW signal accurately. Specifically, the metric used was the sum of square differences between the hidden signal and the predicted signal, corrected for Rician noise:57 (1)SSE=1N∑i=1N(S˜i−Si2+σ2)2σ2 where N is the number of measurements, S˜i is the ith measured signal, S i its prediction from the model and σ the noise standard deviation.