[GRASS-user] error while using i.segment.stats

[Veronica Andreo]

Hi Moritz,

Thanks for your answer :)

In smaller subsets (per cutlines tiles), it works just fine.
I will try later today or tomorrow to run it with grass76.

Best,
Vero

El mar., 3 dic. 2019 a las 12:41, Moritz Lennert (<
mlennert at club.worldonline.be>) escribió:

> Hi Vero,
>
> Le Mon, 2 Dec 2019 13:43:30 +0100,
> Veronica Andreo <veroandreo at gmail.com> a écrit :
>
> > Hi,
> >
> > We are trying to use i.segment.stats for a map with 800000+ segments
> > and already in two different laptops, we get:
> >
> > bands=`g.list rast pat=IGUAZU_IMG_* sep=,`
> >
> RASTER_STATS=(min,max,range,mean,stddev,median,first_quart,third_quart,perc_90)
> > AREA_STATS=(area,perimeter,compact_circle,compact_square,fd)
> >
> > i.segment.stats -rc \
> >                  map=segments_full_region \
> >                  rasters=$bands \
> >                  raster_statistics=$RASTER_STATS \
> >                  area_measures=$AREA_STATS \
> >                  vectormap=segs_stats_map \
> >                  processes=4
> > Calculating geometry statistics...
> > Calculating statistics for raster maps...
> > Exception in thread Thread-3:
> > Traceback (most recent call last):
> >   File "/usr/lib/python3.6/threading.py", line 916, in
> > _bootstrap_inner self.run()
> >   File "/usr/lib/python3.6/threading.py", line 864, in run
> >     self._target(*self._args, **self._kwargs)
> >   File "/usr/lib/python3.6/multiprocessing/pool.py", line 463, in
> > _handle_results
> >     task = get()
> >   File "/usr/lib/python3.6/multiprocessing/connection.py", line 251,
> > in recv return _ForkingPickler.loads(buf.getbuffer())
> > TypeError: __init__() missing 3 required positional arguments:
> > 'module', 'code', and 'returncode'
> >
> > Does it have to do with memory? I used the module a month ago with
> > 500000+ segments and it worked just fine...
>
> I don't think memory is the issue, but I find the error message
> pretty cryptic, so wouldn't exclude altogether. Could it be some
> difference between Python 2 and 3 in the multiprocessing module ? Would
> it be possible for you try running it in Python 2 ?
>
> Maybe you could also try to run it on a smaller subset of the
> segmentation result ?
>
> Moritz
>
>
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