tf.sigmoid(x, name=None)

tf.nn.sigmoid(x, name=None)

tf.sigmoid(x, name=None)

See the guide: Neural Network > Activation Functions

Computes sigmoid of x element-wise.

Specifically, y = 1 / (1 + exp(-x)).


  • x: A Tensor with type float32, float64, int32, complex64, int64, or qint32.
  • name: A name for the operation (optional).


A Tensor with the same type as x if x.dtype != qint32 otherwise the return type is quint8.

numpy compatibility

Equivalent to np.scipy.special.expit

Defined in tensorflow/python/ops/