Numpy: TypeError: Cannot cast ufunc add output from dtype('float64') to dtype('uint8') with casting rule 'same_kind'
I'm using Gizeh library and I get the above error upon installing the latest version of Numpy. There was no error with Numpy version 1.08.
File "animation/target_animation.py", line 161, in draw
fill = gizeh.ImagePattern(self.bg.data, self.bg.pos, filter='best')
File "build/bdist.linux-x86_64/egg/gizeh/gizeh.py", line 295, in __init__
File "build/bdist.linux-x86_64/egg/gizeh/gizeh.py", line 50, in from_image
TypeError: Cannot cast ufunc add output from dtype('float64') to dtype('uint8') with casting rule 'same_kind'
Is there a workaround or would you fix this issue please?
dessskris
All 10 comments
You need to make the cast explicit using the casting argument in the np.add ufunc. The behavior Gizeh depends on has been deprecated since 1.7.
charris
on 10 Feb 2016
That is casting='unsafe'.
charris
on 10 Feb 2016
where should i change this @charris ?
vishalgolcha
on 2 Jun 2016
Typically this is code such as a += b and you need to make it np.add(a, b, out=a, casting="unsafe") (if you are sure you want the unsafe cast behaviour. Or, unless b is huge and it is safe, maybe just cast b first.
seberg
on 2 Jun 2016
I get that I was talking specifically for the changes to be made to gizeh/moviepy .
vishalgolcha
on 3 Jun 2016
In my case, I had a similar issue. It was solved as suggested by seberg. I replaced line 40 in gizeh.py:
arr += image.flatten()
with line:
arr = np.add(arr, image.flatten(), out=arr, casting="unsafe")
I hope this helps somebody else.
mantielero
on 25 Mar 2018
I had this issue when _subtracting_ like this:
yn -= self.y_mean
My error went away when I did the subtraction via numpy.subtract, like so:
yn = np.subtract(yn, self.y_mean, out=yn, casting="unsafe")
Thanks a lot @seberg :+1:
FilipSavic95
on 10 Apr 2018
@FilipSavic95: Could also do yn -= self.y_mean.astype(yn.dtype)
eric-wieser
on 10 Apr 2018
@eric-wieser Yeah, I've just tried your solution and it works. Thanks for posting it. :+1:
FilipSavic95
on 10 Apr 2018
The question is which precision you want to use for the operation itself. the unsafe casting will do the operation in the larger (rhs) precision (or the combined safe dtype) the other option will do the cast and thus the operation in the lower precision.
seberg
on 10 Apr 2018
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Most helpful comment
Typically this is code such as
a += band you need to make itnp.add(a, b, out=a, casting="unsafe")(if you are sure you want the unsafe cast behaviour. Or, unless b is huge and it is safe, maybe just cast b first.