Arap mesh deformation strange result

[yys123456]

Hello everyone, I used Opt API and arap_deformation.t file provided in the example, and when I used a small model with 5 anchor points, I got reasonable result, but when I changed it to a bigger model, I got a very strange result
here are the comparisons:
small:

big:

[yys123456]

I have solved this problem, I need to add Opt_SetSolverParameterand Opt_SetSolverParameter to set iteration times