`parfor` doesn't seem to work with Python lists
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hagai Hargil
am 10 Okt. 2016
Kommentiert: Robert Snoeberger
am 12 Okt. 2016
Hellp everyone,
I'm trying to use a parfor loop that includes a Python list as an input argument to a class array:
allEvents(1:size(hexData, 2), 1) = Event();
parfor n = 1:size(hexData, 2)
allEvents(n) = createSingleEvent(hexData{n}, dataFormat, range, hexToBinMap);
end
where hexData{n} is the mentioned Python list, and allEvents is a preallocated array of class Event() (value class, not handle).
Unfortunately, no matter how I turn it, the parfor loop won't run. Needless to say, a regular for loop compiles properly.
The error I receive is a "Python error: Index exceeds list dimensions". When I manually check possibly-problematic indices I recieve no such error.
By adding a "char(hexData{n})" inside the parfor I receive "Index exceeds matrix dimensions" in the first occasion inside the function where I need to use the hexData{n} value, even if I see that the index definitely exists in that variable:
startOfString = hexDataAsChar(1); % This errors out
Only when I erase all traces that hexData was ever a Python list does MATLAB kindly allows me to parfor this loop.
Any help will be deeply appreciated. Thanks!
0 Kommentare
Akzeptierte Antwort
Robert Snoeberger
am 11 Okt. 2016
If you are using a parpool, then parfor needs to save and load the Python list. Saving (serializing) Python objects into a MAT-file is listed as a limitation .
2 Kommentare
Robert Snoeberger
am 12 Okt. 2016
Unfortunately, I'm not aware of a workaround.
The only idea that I can think of is to wrap the Python object in your own MATLAB class with customized save and load . You might be able to use pickle to do the serialization. I haven't tried it so I don't know if the idea is viable.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Call Python from MATLAB finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!