soft_resto_pderror_reduction_factor:

Required reduction in primal-dual error in the soft restoration phase. $\;$
The soft restoration phase attempts to reduce the primal-dual error with regular steps. If the damped primal-dual step (damped only to satisfy the fraction-to-the-boundary rule) is not decreasing the primal-dual error by at least this factor, then the regular restoration phase is called. Choosing "0" here disables the soft restoration phase. The valid range for this real option is $0 \le {\tt soft\_resto\_pderror\_reduction\_factor } < {\tt +inf}$ and its default value is $0.9999$.