What is the default behavior for unassigned genes?

[lorenzoamir]

Hi, I'm unclear on how the package handles genes that aren't assigned to any module. I see that there is a naColor = 'grey' argument, however the labels2colors function also has a zeroIsGrey = 'True' argument. Does this mean that genes whose module label is 0 are unassigned? What if a module has label 0, but the color is not 'grey'? For example, I am getting this:

WGCNA.datExpr.var[['dynamicColors', 'moduleColors', 'moduleLabels']].value_counts()

dynamicColors  moduleColors  moduleLabels
black          black         0               4702
silver         silver        7               2611
gainsboro      gainsboro     3               2154
whitesmoke     whitesmoke    8               1652
darkgrey       darkgrey      1               1313
dimgrey        dimgrey       2                899
rosybrown      rosybrown     6                714
indianred      indianred     4                114
lightcoral     lightcoral    5                 43
Name: count, dtype: int64

Is the (black) module 0 an actual module or is it supposed to be the gray module?
Thank you!