Python Pytorch RuntimeError: The size of tensor a (…) must match the size of tensor b (…) at non-singleton dimension is an error which occurs for many reasons, the most popular reason is that the image is a non RGB image and has extra alpha channels.
My goal today is to provide a clear and detailed explanation of why this error is happening and how to solve it, we will also check out other ways to get rid of this problem for good.
Exploring Python Pytorch RuntimeError: The size of tensor a (…) must match the size of tensor b (…) at non-singleton dimension
This is an error which occurs for many reasons, the most popular reason is that the image is a non RGB image and has extra alpha channels.
Please double check the error message in this blog post so you can avoid mixing between different python issues.
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RuntimeError: The size of tensor a (...) must match the size of tensor b (...) at non-singleton dimension 0
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Bellow is a number of tested solutions that I have tried and that have worked for me.
The Method which fixed my problem : Convert the non RGB image to an RGB image
The most popular reason why this error occurs is that the image you are working with is a non RGB image.
This is most likely because your image has extra alpha channels or channel.
The error message is very clear about this
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tensor a (...) must match the size of tensor b (...)
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Tensor a and Tensor b have different sizes.
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image1 = Image.open(myimage)
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You should convert the non RGB image to an RGB image like this
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image1 = Image.open(myimage).ConvertImageColorSpace("rgb")
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You can also try the line bellow
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image1 = Image.open(myimage).convert('RGB')
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The error should be gone after the conversion, since the conversion allows tensor a and tensor b to be of the same size.
I hope the fixes above fixed your problem. Thank you so much for following this blog post to the end.
Summing-up :
That is it guys, this is the end of this article aka guide, I hope you found it useful in solving the error : Python Pytorch RuntimeError The size of tensor a must match the size of tensor b at non singleton dimension , make sure to support our work on Kofi, you do not have to but hey you can donate to the team.
Thank you for reading my blog post to the end, If you want to learn more about the Python programming language, check out the official Python Documentation : https://docs.python.org/3/