tf.polygamma(a, x, name=None)

tf.polygamma(a, x, name=None)

See the guide: Math > Basic Math Functions

Compute the polygamma function \(\psi^{(n)} (x)\).

The polygamma function is defined as:

\psi^{(n)}(x) = \frac{d^n}{dx^n} \psi(x)

where \(\psi(x)\) is the digamma function.


  • a: A Tensor. Must be one of the following types: float32, float64.
  • x: A Tensor. Must have the same type as a.
  • name: A name for the operation (optional).


A Tensor. Has the same type as a.

Defined in tensorflow/python/ops/