torch.lgamma

torch.lgamma(input, *, out=None) → Tensor

Computes the natural logarithm of the absolute value of the gamma function on input.

$$\text{out}_{i} = \ln \Gamma(|\text{input}_{i}|)$$

Parameters:

input (Tensor) – the input tensor.

Keyword Arguments:

out (Tensor, optional) – the output tensor.

Example:

>>> a = torch.arange(0.5, 2, 0.5)
>>> torch.lgamma(a)
tensor([ 0.5724,  0.0000, -0.1208])