mindspore.ops.igamma

mindspore.ops.igamma(input, other)

Calculates lower regularized incomplete Gamma function.

If we define input as a and other as x, the lower regularized incomplete Gamma function is defined as:

\[P(a, x) = Gamma(a, x) / Gamma(a) = 1 - Q(a, x)\]

where

\[Gamma(a, x) = \int_0^x t^{a-1} \exp^{-t} dt\]

is the lower incomplete Gamma function.

Above \(Q(a, x)\) is the upper regularized complete Gamma function.

Warning

This is an experimental API that is subject to change or deletion.

Parameters

• input (Tensor) – The first input tensor.

• other (Tensor) – The second input tensor.

Returns

Tensor

Supported Platforms:

Ascend GPU CPU

Examples

>>> import mindspore
>>> input = mindspore.tensor([2.0, 4.0, 6.0, 8.0])
>>> other = mindspore.tensor([2.0, 3.0, 4.0, 5.0])
>>> output = mindspore.ops.igamma(input, other)
>>> print(output)
[0.5939941  0.35276785 0.21486954 0.13337176]