Handle multi inputs

The current PTQ version is using custom functions getFirstNode and getLastNode that does not handle multi inputs / outputs. Instead use the graphView functions getOrderedinputs and getOrderedOuputs.

Is this still the case @noamzerah @bhalimi ?

@bhalimi Please respond so we can close this issue (or not)

It is still the case actually. So we have to fix this !

mentioned in merge request !35 (closed)

mentioned in merge request !46 (merged)

closed