Fixing the node positions in the layout using gephi toolkit -

I am trying to create a fruiterman reinling layout using the gephi toolkit. I saw that the node's position is changing for the same data. How to fix node posts? Since the data is the same, the layout should not be changed.

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this method Node.getnoddata () is SetFixed (true); but I have not tried it. Recently, one of my colleagues who was trying to apply a spit, could not get it to work