Here’s a more general ICE tree for inverting weightmaps: it handles weightmaps that are not in the 0-1 value.
When I first worked it out in my head I saw it like this:
But that’s just the same as using a Rescale:
Here’s a weightmap before and after being inverted by the above. In this example, the weightmap has a value range of -1 to 3.
Before:
After (inverted):
Looking at those, maybe I should do something like this:
Which gives this inverted weightmap:
eX-SI 
I don’t understand how the OutName goes into the InName then you get the ..weights, ..MinWeight etc for the GetData node ?
See my Saturday post for a intro video on this subject.
In brief, using Out Name to In Name connections allow to take a scene refererence like this:
cone.polymsh.cls.WeightMapCls.Weight_Map
and separate it into pieces:
cone
.polymsh.cls.WeightMapCls
.Weight_Map
The Out Name to In Name connection combines the pieces of the scene reference