Neural Network backpropagation Calculation
실제계산 https://mattmazur.com/2015/03/17/a-step-by-step-backpropagation-example/
공학용 계산기 https://www.desmos.com/scientific
(sigmoid f(x))' = f(x)(1-f(x))
data_analysis:nn_backpropagation_calc
실제계산 https://mattmazur.com/2015/03/17/a-step-by-step-backpropagation-example/
공학용 계산기 https://www.desmos.com/scientific
(sigmoid f(x))' = f(x)(1-f(x))
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