gammaln¶

paddle. gammaln ( x, name=None ) [source]

Calculates the logarithm of the absolute value of the gamma function elementwisely.

Parameters

• x (Tensor) – Input Tensor. Must be one of the following types: float16, float32, float64, bfloat16.

• name (str, optional) – Name for the operation (optional, default is None). For more information, please refer to Name.

Returns

Tensor, The values of the logarithm of the absolute value of the gamma at the given tensor x.

Examples

>>> import paddle

>>> x = paddle.arange(1.5, 4.5, 0.5)
>>> out = paddle.gammaln(x)
>>> print(out)
Tensor(shape=[6], dtype=float32, place=Place(cpu), stop_gradient=True,
    [-0.12078224,  0.        ,  0.28468287,  0.69314718,  1.20097363,
        1.79175949])