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Segment-wise linear approximation of sigmoid.
Aliases:
tf.keras.backend.hard_sigmoid(x)
Faster than sigmoid.
Returns 0. if x < -2.5, 1. if x > 2.5.
In -2.5 <= x <= 2.5, returns 0.2 * x + 0.5.
Arguments:
x: A tensor or variable.
Returns:
A tensor.