Fix ZPlus gradient_mapper for negative inputs #100
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- ZPlus rule was wrong for negative inputs: each output partition used its own respective sum for the denominator (i.e. like alpha-beta would handle positive and negative outputs) - for the correct ZPlus the denominator of each (2) output partitions is the sum of all positive outputs
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own respective sum for the denominator (i.e. like alpha-beta would
handle positive and negative outputs)
of all positive outputs