def derivative(self, input=None):
"""Backward propagation.
Returns
-------
float32
The derivative of SymmetricElliot function.
"""
last_forward = 1 + np.abs(input * self.steepness) if input else self.last_forward
return self.steepness / np.power(last_forward, 2)
# symmetric-elliot-end
# softplus-start
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