Is DFT code deterministic?

[mkolopanis]

I ran the DFT code twice from commit f22d933 in offline and received differing results from both runs. This is troubling considering the input should have been identical.

command used:

python LWA_bifrost_DFT.py --offline --tbnfile=/data5/LWA_SV_data/data_raw/TBN/Jupiter/058161_000086727 --imagesize 64 --imageres 1.79057 --nts 512 --channels 4 --accumulate 50 --ints_per_file 40 --out_dir dft/run_?

See attached jupyter notebook output for more information.
dft_comparison.pdf

[adampbeardsley]

This sounds a lot like the bug we fixed in #4. Maybe check that the synchronization lines we added are in fact still there and didn't get bulldozed by a merge at some point?
https://github.com/epic-astronomy/LWA_EPIC/pull/4/files

[mkolopanis]

thanks for this. I'll take a look.

[mkolopanis]

I will implement this in my script_consolidation branch. Looks like I already did 😆
the two runs are identical at least on commit f7a59d3
dft_comparison_update.pdf