enhancementhelp wanted
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描述
currently there is a 2d solver, but we require a 3d solver and soon will require higher-dimensions:
- #1210
newton_step()method that dispatches among {1d, 2d, 3d, nd}. - #1210
newton_step_1d()solver that computes min eig of Hessian - #1210
newton_step_3d()solver that computes min eig of Hessian -
newton_step_nd()solver using Powell's dog-leg method (see See section 3.5 of Madsen's Method for nonlinear least squares problems)