gdal.Polygonize is making invalid geometries and later in processing chain an error is reported stating that there are Ring Self-Intersections. Not one, quite a few so manual solution is not an option in my case. Is there any solution to this problem? I am using Python 2.7 and QGIS. Hot spot (ring self-intersection) is circled in red. 
Question is the same like QGIS Raster to Polygons produce invalid geometries, but I am looking for some solution using Python and its libraries.
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