PetscRegressor Object: 1 MPI process
  type: linear
    PetscRegressor Linear Type: ols
    KSP Object: (regressor_linear_) 1 MPI process
      type: lsqr
        standard error not computed
        using inexact matrix norm
      maximum iterations=10000, initial guess is zero
      tolerances: relative=1e-05, absolute=1e-50, divergence=10000.
      left preconditioning
      using UNPRECONDITIONED norm type for convergence test
    PC Object: (regressor_linear_) 1 MPI process
      type: none
      linear system matrix, followed by the matrix used to construct the preconditioner:
      Mat Object: 1 MPI process
        type: seqaij
        rows=10, cols=10
        total: nonzeros=10, allocated nonzeros=10
        total number of mallocs used during MatSetValues calls=0
          not using I-node routines
      Mat Object: 1 MPI process
        type: normal
        rows=10, cols=10
    total KSP iterations: 1