Restore determinism in beersheba tests - #977
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gonzaponte wants to merge 3 commits into
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gonzaponte wants to merge 3 commits into
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The separate-mode fixture updated `deconv_params` on the shared `beersheba_config` dictionary. Pytest reuses a fixture's returned object within a test, so requesting both fixtures could leave the base configuration set to separate mode as well. A deep copy of the base configuration before changing to separate mode prevents this issue. Tests can now use independent configurations for joint and separate deconvolution, so each variant exercises the mode it intends to check.
FFT convolution can produce tiny negative or near-zero values through floating-point roundoff. Replacing only exact zeros (as we have been doing so far) with machine epsilon leaves those values in place; dividing the image by them can greatly amplify numerical noise during the Richardson–Lucy update. Clamping the convolved estimate to at least machine epsilon before calculating the relative blur keeps the denominator positive and prevents small roundoff differences from causing large changes in the reconstruction.
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This PR addresses instabilities in the RL algorithm caused by roundoff errors. At the same time, it fixes a silent issue by which the "joint" mode of beersheba was not being exercised. After fixing this issue, the exact_result tests are no longer flaky.
Closes #975.