DFTPredict :: (SourceModel, GainModel) -> Visibilties

[Joshuaalbert]

We evaluate the DFT of sky model and gains.

Input:

• discrete sky model
• joint gain model
• pointing
• freq
• time
• uvw

How:

• We compute the gains for the discete points [source, time, ant, freq, 2, 2]
• We shard over freq because there is no dependency or reduction over frequency. Could also shard over time.
• We accumlate over source, rather than vectorising and reducing which requires allocating.

[Joshuaalbert]

In testing phase