Hi cubiq, I have a idea but don't know how to achieve

[kelvinyoung]

By using FaceAnalysis, I can get a image with Value & DIST on it, and also there is a string "Distance". Now I try to convert the string to a float type data that I can use a compare node to compare it with another float which I defined as a passing grade（e.g. 0.25）, then if the float converted from "Distance" is large than the passing grade, that trigger the next same ksampler to excute or add a new queue.

[cubiq]

not sure I completely understand but that would require an IF/trigger node I guess

[kelvinyoung]

not sure I completely understand but that would require an IF/trigger node I guess
the output [distance] is type of list, how can i convert it to string or float?

[cubiq]

you can use a SimpleMath node to convert it to Float. I believe a[0] should return a float but you can also do something like sum(a)/len(a) to get an average

[kelvinyoung]

I did as you teach me, but it dose not work.