The answer is in the documentation.
Let cg be the mapmap instance returned by Seaborn.
After drawing the cluster map, enter the following to remove the line dendrogram.
cg.ax_row_dendrogram.set_visible(False)
If you want to keep the legend, enter:
cg.ax_row_dendrogram.set_xlim([0,0])
It's a hack, but set_axis_off() doesn't seem to do in Seaborn what it does in matplotlib.
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