tf.math.sign

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

View aliases

Main aliases

tf.sign

Compat aliases for migration

See Migration guide for more details.

tf.compat.v1.sign

tf.math.sign(
    x, name=None
)

Used in the notebooks

Used in the tutorials
Adversarial example using FGSM Tutorial on Multi Armed Bandits in TF-Agents

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        ])>

Args
x	A Tensor. Must be one of the following types: bfloat16, half, float32, float64, int32, int64, complex64, complex128.
name	A name for the operation (optional).

Returns
A Tensor. Has the same type as x. If x is a SparseTensor, returns SparseTensor(x.indices, tf.math.sign(x.values, ...), x.dense_shape). If x is a SparseTensor, returns SparseTensor(x.indices, tf.math.sign(x.values, ...), x.dense_shape)