def imageset(self, imageset = "trainval"):
        imageset = "{0}.txt".format(imageset)
        path = os.path.join(self.root, "ImageSets", "Main", imageset)
        for line in open(path):
            yield line.strip()
Gets a ctypes pointer array (of length `n`) for GEOSGeom_t opaque pointer.
dataset/ETHPy150Open cvondrick/pyvision/vision/pascal.py/PascalDataset.imageset--crossover with--dataset/ETHPy150Open django/django/django/contrib/gis/geos/libgeos.py/get_pointer_arr