Add SiLU activation function #915
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Adds Sigmoid-Weighted Linear Unit (SiLU) activation function.
It's definition is
x * x.sigmoid()and it's derivative isx * sigmoid'(x) + sigmoid(x).Note: I haven't made an actual pytorch test to compare, not even locally, but have made a bigger test that depend on this functionality (edit: in fact, inference only) and it appeared to work ok. So this PR should be considered a draft.