tf.math.sign

Returns an element-wise indication of the sign of a number.

Used in the notebooks

Used in the tutorials

y = sign(x) = -1 if x < 0; 0 if x == 0; 1 if x > 0.

For complex numbers, y = sign(x) = x / |x| if x != 0, otherwise y = 0.

Example usage:

# real number
tf.math.sign([0., 2., -3.])
<tf.Tensor: shape=(3,), dtype=float32,
numpy=array([ 0.,  1., -1.], dtype=float32)>
# complex number
tf.math.sign([1 + 1j, 0 + 0j])
<tf.Tensor: shape=(2,), dtype=complex128,
numpy=array([0.70710678+0.70710678j, 0.        +0.j        ])>