Det() returns zero for the sigular matrix

[IvanaGyro]

According to cuSOLVER's document, returned devInfo greater than zero means U[devInfo - 1, devInfo - 1] (zero-indexed) is zero, which implies the determinant is zero.

[IvanaGyro]

Link to the document: https://docs.nvidia.com/cuda/cusolver/index.html#cusolverdn-t-getrf

If LU factorization failed, i.e. matrix A (U) is singular, The output parameter devInfo=i indicates U(i,i) = 0.
If output parameter devInfo = -i (less than zero), the i-th parameter is wrong (not counting handle).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.58%. Comparing base (672b7e9) to head (eb67ff2).
Report is 3 commits behind head on dev-master.

Additional details and impacted files

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  Lines           44733    44733           
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  Misses          32751    32751           
  Partials         4114     4114           

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