Calculate exp(x) - 1 for all elements in the array.
This function provides greater precision than exp(x) - 1 for small values of x.
The true value of exp(1e-10) - 1 is 1.00000000005e-10 to about 32 significant digits. This example shows the superiority of expm1 in this case.
>>> np.expm1(1e-10) 1.00000000005e-10 >>> np.exp(1e-10) - 1 1.000000082740371e-10
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