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why non-negative for node.sum #199

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Benbinbin opened this issue Nov 24, 2022 · 0 comments
Open

why non-negative for node.sum #199

Benbinbin opened this issue Nov 24, 2022 · 0 comments

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@Benbinbin
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the documentation say the value function at node.sum(value) must return the non-negative number

The function is passed the node’s data, and must return a non-negative number.

I don't know why limit the return number as a non-negative? I think the nagetive also make sense at some situation.
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@Benbinbin