What is the "Robust linear solver"

Dear all,
I have one basic question: What is the “robust linear solver” triggered by robust_lin_solve ? What I can see is that it works very fast.
Many thanks,

It triggers an explicit inversion using the Moore-Penrose pseudo-inverse during the Newton steps. In most contexts that operation is computationally prohibitively expensive, but in some contexts it works extremely well and fast.

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