|---| | [ View source on GitHub](https://github.com/tensorflow/tensorflow/blob/v2.21.0/tensorflow/python/ops/math_ops.py#L775-L819) | Returns an element-wise indication of the sign of a number. #### View aliases **Main aliases** [`tf.sign`](https://www.tensorflow.org/api_docs/python/tf/math/sign) **Compat aliases for migration** See [Migration guide](https://www.tensorflow.org/guide/migrate) for more details. [`tf.compat.v1.sign`](https://www.tensorflow.org/api_docs/python/tf/math/sign)
tf.math.sign( x, name=None ) ### Used in the notebooks | Used in the tutorials | |---| | - [Adversarial example using FGSM](https://www.tensorflow.org/tutorials/generative/adversarial_fgsm) - [Tutorial on Multi Armed Bandits in TF-Agents](https://www.tensorflow.org/agents/tutorials/bandits_tutorial) | `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.]) # complex number tf.math.sign([1 + 1j, 0 + 0j])


| ## 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)` ||