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CuSPECTrecon v0.01 #1

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ZongyuLi-umich
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I have to set rtol = 0.05 in line 66 of /test/Cubackproject.jl to pass the adjoint test with random seed "0".
Could you help reduce this tolerance?

@JeffFessler
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One place to start would be to add a test/ directory with some tests where you compare individual functions with SPECTrecon.jl and see which function(s) differ the most.
(Maybe the issue is just the -angle for the back-projector, but still we should have tests comparing the two versions.)

@ZongyuLi-umich
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I made a correction to the backproject.jl.

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