Softplus function (chart) Calculator

Calculates a table of the softplus functions and draws the chart.

 The softplus function is used in the activation function of the neural network.

 initial value x [increment repetition]
 $\normal Softplus\ function\ \phi (x)\\[10]\normal \phi (x) = \large ln(1+e^x) \\[15]\normal \phi ' (x) = \large \frac{1}{1+e^{-x}} \\[15]$

Softplus function (chart)
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