sigmoid 0.3.0

• add Rectified Linear Unit (ReLU)

• add leaky Rectified Linear Unit (leaky ReLU)

• redo documentation

sigmoid 0.2.0

• add vignette

• add tanh derivative

sigmoid 0.1.0

• initial release

• implement logistic and Gompertz

• implement inverses (logit and inverse Gompertz)

• implement SoftMax

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