[BUG] cuspatial._lib.soa_readers example out of date with API?

[randerzander]

I'm trying to follow this example.

import cuspatial._lib.soa_readers as readers
import cuspatial._lib.spatial as gis

fpos, rpos, plyx, plyy = readers.cpp_read_ply_soa(fn)

Result:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-19-8c68f35633c5> in <module>
      3 
      4 
----> 5 fpos, rpos, plyx, plyy = readers.cpp_read_ply_soa(fn)

AttributeError: module 'cuspatial._lib.soa_readers' has no attribute 'cpp_read_ply_soa'

[randerzander]

I tried cpp_read_polygon_soa(soa_file_name) instead and get a different error:

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-22-a89fda1f9a7e> in <module>
      2 import cuspatial._lib.spatial as gis
      3 
----> 4 fpos, rpos, plyx, plyy = readers.cpp_read_polygon_soa(fn)

cuspatial/_lib/soa_readers.pyx in cuspatial._lib.soa_readers.cpp_read_polygon_soa()

cuspatial/_lib/soa_readers.pyx in cuspatial._lib.soa_readers.cpp_read_polygon_soa()

RuntimeError: cuDF failure at: /rapids/cuspatial/cpp/src/utility/utility.hpp:192: numbers of groups/features/rings/vertices must be positive

This is against a file that imports ok with shapefile as in the shapely_locust demo:

plyreader = shapefile.Reader(fn)
polygon = plyreader.shapes()
plys = []
for shape in polygon:
    plys.append(Polygon(shape.points))

[thomcom]

Sorry, Randy. This PR has the updated demos:
#44

[thomcom]

Fixed by #44