mindspore.ops.bessel_i1e

mindspore.ops.bessel_i1e(x)

Computes exponential scaled modified Bessel function of the first kind, order 1 element-wise.

The formula is defined as:

$$\begin{array}{r}\begin{array}{l}\\ {\text{I}}_{1}e(x)=e^{(-|x|)}\ast I_1(x)=e^{(-|x|)}\ast \sum _{m=0}^{\mathrm{\infty }}\frac{x^{2m+1}}{2^{2m+1}m!(m+1)!}\end{array}\end{array}$$

where $I_1$ is modified Bessel function of the first kind, order 1.

Parameters

x (Tensor) – The input tensor. The data type must be float16, float32 or float64.

Returns

Tensor, has the same shape and dtype as the x.

Raises

• TypeError – If x is not a Tensor.

• TypeError – If dtype of x is not float16, float32 or float64.

Supported Platforms:

Ascend GPU CPU

Examples

>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.array([-1, -0.5, 0.5, 1]), mindspore.float32)
>>> output = ops.bessel_i1e(x)
>>> print(output)
[-0.20791042  -0.15642083  0.15642083  0.20791042]