The domain of the inverse hyperbolic tangent is (-1, 1) and values outside this range will be mapped to NaN, except for the values 1 and -1 for which the output is mapped to +/-INF respectively.
\mboxouti=tanh−1(\mboxinputi)
atanh(input, *, out=None) -> Tensor
Returns a new tensor with the inverse hyperbolic tangent of the elements of input.