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Add 'sagecalpredict' step for model prediction

Sarod Yatawatta requested to merge sagecal_predict into master

Add 'sagecalpredict' step for model prediction., example parset:

predict.type=sagecalpredict

Depending on how libdirac(radio) is build, either CPU or GPUs will be used for prediction.

To enable GPU prediction, build libdirac with -DHAVE_CUDA=ON and -fPIC option (-DCMAKE_POSITION_INDEPENDENT_CODE=ON) and compile DP3 with -DLIBDIRAC_PREFIX=/where/libdirac/installed and -DHAVE_CUDA=ON flags

To enable ddecal with sagecal prediction, use

ddecal.sagecalpredict=true

Edited by Sarod Yatawatta

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