# tensorplay.special._gamma API

Source: https://www.tensorplay.cn/docs/api/tensorplay.special._gamma.html

## Functions 4

[#](#api-tensorplay.special._gamma.gammaln)

### gammaln

function[Full reference ↗](/docs/generated/tensorplay.special._gamma.gammaln.html)

```python
tensorplay.special._gamma.gammaln(input)
```

Natural log of the absolute value of the gamma function (native lgamma).

[#](#api-tensorplay.special._gamma.multigammaln)

### multigammaln

function[Full reference ↗](/docs/generated/tensorplay.special._gamma.multigammaln.html)

```python
tensorplay.special._gamma.multigammaln(input, p)
```

Multivariate log-gamma with dimension p (p >= 1).

[#](#api-tensorplay.special._gamma.polygamma)

### polygamma

function[Full reference ↗](/docs/generated/tensorplay.special._gamma.polygamma.html)

```python
tensorplay.special._gamma.polygamma(n, input)
```

Polygamma of order n: $\psi^{(n)}(x)$ (native kernel).

[#](#api-tensorplay.special._gamma.psi)

### psi

function[Full reference ↗](/docs/generated/tensorplay.special._gamma.psi.html)

```python
tensorplay.special._gamma.psi(input)
```

Digamma function; alias of digamma().