Remove spaces (buffer) between polygons

[janetteeco]

This is a question for samgeo.py. I am using generate and tiff_to_vector to segment a geotiff and produce a shapefile of the results. For the most part it does exactly what I need it to do. However, there seems to be a buffer around the polygons produced. I've attached a screenshot showing an example of what I am talking about. Getting rid of that buffer is causing issues for the geospatial analysts I am working with. Is there a way to ensure that there is no buffer (no gaps or slivers between polygons)?

When I say buffer, I mean the white spaces between all the green polygons in this image.