group by sites rather than by wav file to reduce leakage potential #107
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to reduce leakage, buowsets were grouped by their original wav file so that detections from the same file were not split up into different folds to reduce leakage. for further leakage mitigation, this change groups by site so that not only are the same original wav files kept in the same folds, but files from the same site also stay in the same fold. there are not many sites in buowset 1.0-1.2, so some of the classes are not represented in all the folds, like no matter how you split it, for some semblance of keeping distribution the same, one fold will never have chick begging if we stratify this way until we gain more data or more sites.
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To reduce leakage, buowsets were grouped by their original wav file so that detections from the same file were not split up into different folds to reduce leakage. For further leakage mitigation, this change groups by site so that not only are the same original wav files kept in the same folds, but files from the same site also stay in the same fold. There are not many sites in buowset 1.0-1.2, so some of the classes are not represented in all the folds, like no matter how you split it, one fold will never have chick begging if we stratify this way until we gain more data or more sites.
This was done with the existing metadata for buowset1.2, so it did not need to be regenerated, all the files are the same, but the folds for each detection were recalculated and reassigned, seen in the 5-fold metadata file.
Resolves #105