Fix incorrect image channels when dealing with 1x1 image #8954

[zyddnys]

Since input is PIL image, the input data format is always channels last, this PR prevents transformers from inferring image format and thus fix #8954

[github-actions]

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[DarkLight1337]

Thanks for fixing!

[DarkLight1337]

Please run format.sh to fix the lint errors.

[DarkLight1337]

After some offline discussion with @alex-jw-brooks, I just remembered that the input mapper for MiniCPM-V has been changed to a custom one in #8250, so this fix doesn't actually work for that model.

Moreover, not all image processors accept data_format="channels_last" as a keyword argument, so this change may break other models as well. To avoid this, I suggest using inspect.get_signature or something like that to only pass in data_format if it's indeed supported by the processor. For MiniCPM-V though, their image mapper doesn't support data_format, so you'll have to ask HF side to add this first.

[sfyumi]

How can i do to just workaround it for MiniCPM-V?

[DarkLight1337]

How can i do to just workaround it for MiniCPM-V?

I suggest you validate the images before sending them into vLLM engine.