watchdog_shortened_iter_trigger:

Number of shortened iterations that trigger the watchdog. $\;$
If the number of successive iterations in which the backtracking line search did not accept the first trial point exceeds this number, the watchdog procedure is activated. Choosing "0" here disables the watchdog procedure. The valid range for this integer option is $0 \le {\tt watchdog\_shortened\_iter\_trigger } < {\tt +inf}$ and its default value is $10$.