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* Mish activation function and its derivative Signed-off-by: raver119 <raver119@gmail.com> * signature fix Signed-off-by: raver119 <raver119@gmail.com> * mish as activation for dl4j Signed-off-by: raver119 <raver119@gmail.com> * javadoc Signed-off-by: raver119 <raver119@gmail.com> * minor optimization Signed-off-by: raver119 <raver119@gmail.com>