Initializing weights #45
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avoid choosing fixed nodes in variation operations
Although there core dumps were not occuring, the different size between X and y would crash the tests if we attempted to do some operation that relies on these values. I fixed this, as I'm starting to make search space initialize weights (the tests were crashing for this exact reason)
Also fixed PTC2 generating programs twice as big as it should. Now PTC2 takes into account that terminal nodes are weighted by default, and discounts these nodes while expanding the tree.
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