EDDY ERROR

[Giorgio Marcello]

Dear Dr. Ye, 

while running EDDY in Step T2 Reconstruction an error window pop-up (both with last softwere version and with "Mar 31 2025)":

error: chol(): decomposition failed

EDDY:::  NewSphericalKMatrix::GetHyperParGuess: Unable to find valid hyperparameters
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\KMatrix.cpp:::  GetHyperParGuess:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\HyParEstimator.cpp:::  Estimate:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\DiffusionGP.cpp:::  EvaluateModel:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\cuda\EddyInternalGpuUtils.cu:::  load_prediction_maker:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\cuda\EddyGpuUtils.cu:::  LoadPredictionMaker:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\eddy.cpp:::  Register:  Exception thrown

EDDY::: Eddy failed with message EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\eddy.cpp:::  DoVolumeToVolumeRegistration:  Exception thrown

Then I tried again and obtain another error:

EDDY:::  DataSelector::common_constructor: rnvox greater than number of non-zero voxels in mask.
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\HyParEstimator.cpp:::  common_constructor:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\HyParEstimator.h:::  DataSelector:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\DiffusionGP.cpp:::  EvaluateModel:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\cuda\EddyInternalGpuUtils.cu:::  load_prediction_maker:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\cuda\EddyGpuUtils.cu:::  LoadPredictionMaker:  Exception thrown
EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\eddy.cpp:::  Register:  Exception thrown
EDDY::: Eddy failed with message EDDY:::  D:\a\TinyFSL\TinyFSL\fsl\include\eddy\eddy.cpp:::  DoVolumeToVolumeRegistration:  Exception thrown

I've never get this message before, what have I to do?

[Frank Yeh]

The b table has an issue. Likely there are invalid values there.

Frank

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[Giorgio Marcello]

Hi Frank, I tried again after b table correction (there were b0 value assigned as 800 and 1600), but now i'm stuck with similar error:

error: chol(): decomposition failed

...................Allocated GPU # 0...................

Loading prediction maker

Evaluating prediction maker model

EDDY::: NewSphericalKMatrix::GetHyperParGuess: Unable to find valid hyperparameters

EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\KMatrix.cpp::: GetHyperParGuess: Exception thrown

EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\HyParEstimator.cpp::: Estimate: Exception thrown

EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\DiffusionGP.cpp::: EvaluateModel: Exception thrown

EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\cuda\EddyInternalGpuUtils.cu::: load_prediction_maker: Exception thrown

EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\cuda\EddyGpuUtils.cu::: LoadPredictionMaker: Exception thrown

EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\eddy.cpp::: Register: Exception thrown

EDDY::: Eddy failed with message EDDY::: D:\a\TinyFSL\TinyFSL\fsl\include\eddy\eddy.cpp::: DoVolumeToVolumeRegistration: Exception thrown

EDIT: I made the fib file after cheking b table and deleting multiple "bad slices", but that was a step that I, usually, used to do after EDDY and motion correction. I don't know why with this acquisition this works differently from previous elaborations. If it is usefull I'll upload the sz file.

Thanks in regards and happy holidays!