NSLS2 / NSLS2/pyCHX

[v2][_commonspeckle] two time correlation function for image input data is broken

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_commonspeckle bug discussion V2
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Description

pyCHX.chx_correlation.two_time_corr don't edit unless needed now by CHX

pyCHX._v2.chx_correlation.two_time_corr is equivalent to what is found in sckit-beam. This function is unique in that it allows for a mult-tau - like calcuation of the two-time autocorrelation function.

This function used in a CSX environment runs into a IndexError exception. All the other basic functions that are simliar between sckit-beam and pyCHX work as expected.

  • need to diff these two library functions to see if there is a difference in the code
  • identify fix and fix pyCHX._v2.chx_correlation.two_time_corr.

As discussed with @afluerasu, @yugangzhang 's code here is unique and is nice to keep. Paper pending. Note that xi-cam is using this function in skbeam.

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Compare pyCHX._v2.chx_correlation.two_time_corr with the equivalent scikit-beam function first, then reproduce the IndexError with CSX image input data. Identify the difference and update only pyCHX._v2.chx_correlation.two_time_corr; leave pyCHX.chx_correlation.two_time_corr unchanged unless needed. Done means the function no longer raises IndexError and retains its intended mult-tau-like two-time autocorrelation behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
data
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
42/100

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