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R raster - take stratified sample

This question was posted in stackexchange, where there were no views/comments/answers. I have a raster file and would like to take a stratified sample. library(raster) f = system.file("...
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How can ee.Image.stratifiedSample() be used in Google Earth Engine to select training samples for a binary classifier?

This is a follow-on question to How can one create a binary image from a FeatureCollection in Google Earth Engine? The corresponding minimal example can be found here: https://code.earthengine.google....