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Hi, @shchhan123456. I found some difficulties to make this feature. `scipy.signal.lfilter` uses a [direct form II transposed ](https://ccrma.stanford.edu/~jos/fp/Transposed_Direct_Forms.html)implementation, so the initial condition `zi` is simply a vector. In contrast, torchaudio...

Hi @nateanl, no need to apologize, I was also working on other things. An example of how to get `zf` value: ```c++ std::tuple lfilter_core( ... int64_t n_order = b_coeffs.size(1); //...

Hi @roedoejet, The sox backend does not support file-like objects, which has been stated in the documentation. https://pytorch.org/audio/2.1.0/torchaudio.html Would recommend you use either ffmpeg or soundfile as the backend.

@faroit > Have you seen our implementation in https://github.com/sigsep/open-unmix-pytorch/blob/master/openunmix/filtering.py ? > Thanks for the info, I haven't checked this one before. > * Is yours using complex or real dtypes?...

> Thanks a lot, that's great !! I remember talking to you about doing a PR for norbert, that's fantastic you took time to do it. @aliutkus Yeah, I remember...

@faroit @aliutkus I added the regression tests and should be ready for review. See below for the benchmarks. ## Profile ### Norbert Torch ``` ----------------------------- ------------ ------------ ------------ ------------ ------------...

@faroit No problem. Take your time. Let's first enjoy the ISMIR conference 😆

Hi, any one interested in this issue? I also want to share my implementation of phase unwrapping algorithm described in the paper [A novel phase unwrapping method based on network...

> As for the code: maybe we should evaluate the performance of different solutions before implementing them all. There might be some more recent review scientific literature on this? At...

> @yoyololicon , have you seen the following publication which also solves an integer optimization problem via graph cuts? > J. M. Bioucas-Dias and G. Valadao, "Phase Unwrapping via Graph...