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Unsupervised classification to improve the quality of a bird song recording dataset. https://doi.org/10.1016/j.ecoinf.2022.101952

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Hi Sylvain, I think the reason the ROI plot hangs open is that the nrow parameter for maad.util.plot_spectrogram function should be set to False. Many thanks, Michela

I have found a problem related to the [`find_cluster`](https://github.com/ear-team/bambird/blob/master/bambird/cluster.py#L303) function. When finding the cluster for each categories separately, the function test if the number of ROIs is higher than 2...

When trying to use bambird.query_xc I get the following error "AttributeError: 'DataFrame' object has no attribute 'append'. Did you mean: '_append'? in scikit-maad" originating from maad/util/xeno_canto.py line 224

The function dataset.grab_audio_to_df() and segmentation.multicpu_extract_rois() uses the attribute 'append'. However, this attribute has been deprecated since pandas 2.0. New version should use 'concat' for the package to be compatible with...

The function [`multicpu_extract_rois`](https://github.com/ear-team/bambird/blob/master/bambird/segmentation.py#L317) allows to extract ROIs directly from a directory. However, if it appears that the audio files are encoded using the `wav` format this does not work because...