The feature_scale table
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The feature_scale table is an automatically generated table that contains one or several schema for scaling features. Features are scaled for several purposes, including similarity measurements, based their distribution. We are interested in two types of distributions: distribution of raw features (pitch, FM…) and the distribution of syllable features (mean_pitch, mean_FM, var_pitch, etc). To scale features we need to know the central tendency and width of the distributions in a representative sample of data (e.g., within the songs of 100 zebra finches). We use the median and the median absolute deviation (MAD) of each feature to characterize those distributions. SAP2 comes with a zebra finch settings and users can easily add settings for other species, song types, etc.
  

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