I’m currently trying to use `torchaudio.transforms.Spectrogram`

with `power = None`

to return the complex spectrogram. The `forward`

method of this class returns a tensor with a shape of `(...,2)`

. I am aware that the last two dimensions represent the real and imaginary parts, but it is not clear from the documentation which one is which and how they represent a complex tensor.

For example, if `torchaudio.transforms.Spectrogram`

returns `x`

with shape `(256,256,2)`

, is `x[...,0]`

the real part or the imaginary part? Also, if `x`

was a complex tensor, then would it be expressed as `x[...,0] + x[...,1]j`

or `x[...,1] + x[...,0]j`

?