refactor: simple inv_sqrt, green CI · VowpalWabbit/vowpal_wabbit@46438c3

Process completed with exit code 1.

‘struct Eigen::internal::qr_preconditioner_impl<Eigen::Matrix<float, -1, -1>, 40, 0, true>’ has no member named ‘run’

‘struct Eigen::internal::qr_preconditioner_impl<Eigen::Matrix<float, -1, -1>, 40, 1, true>’ has no member named ‘run’

‘struct Eigen::internal::qr_preconditioner_impl<Eigen::Matrix<float, -1, -1>, 40, 0, true>’ has no member named ‘allocate’

‘struct Eigen::internal::qr_preconditioner_impl<Eigen::Matrix<float, -1, -1>, 40, 1, true>’ has no member named ‘allocate’

Process completed with exit code 1.

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