megengine.functional.expm1¶
- expm1(x)[source]¶
Element-wise \(e^x - 1\) function.
Calculate the exponential of the elements minus 1 of input.
This function has domain
[-infinity, +infinity]and codomain[-1, +infinity].\[y_i = e^{x_i} - 1\]- Parameters
x – input tensor. Should have a floating-point data type.
- Returns
a tensor containing the evaluated result for each element in \(x\). The returned tensor must have a floating-point data type determined by Type promotion rules.
Note
This function provides greater precision than \(\exp(x) - 1\) for small values of x. See FDLIBM, or some other IEEE 754-2019 compliant mathematical library, for a potential reference implementation.
Examples
>>> F.expm1(1e-10) Tensor(1e-10, device=xpux:0)