tf.polygamma

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

Defined in tensorflow/python/ops/gen_math_ops.py.

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.

Args:

• 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).

Returns:

A Tensor. Has the same type as a.