mindspore.ops.bessel_i1

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mindspore.ops.bessel_i1(x)[source]

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

\[\begin{split}\begin{array}{ll} \\ I_{1}(x)=\mathrm{i}^{-1} J_{1}(\mathrm{i} x)=\sum_{m=0}^ {\infty} \frac{x^{2m+1}}{2^{2m+1} m ! (m+1) !} \end{array}\end{split}\]

where \(J_{1}\) is 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:

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_i1(x)
>>> print(output)
[-0.5651591  -0.25789431  0.25789431  0.5651591]