[Bugfix] Fix Phi-3v crash when input images are of certain sizes

[zifeitong]

Currently, phi3v will crash if the input image sizes are of certain sizes (e.g. 465x226) with error message like: raise ValueError(ValueError: Attempted to assign 457 = 457 multimodal tokens to 757 placeholders)

This PR removes a duplicated _calc_hd_transform_size() call, since _calc_hd_transform_size() is called in get_phi3v_image_feature_size(). Additionally, _calc_hd_transform_size() in get_phi3v_image_feature_size() uses the right hd_num obtained from config file.

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[ywang96]

Thank you for the fix!

I assume this didn't get caught by our CI because this function itself wouldn't changew, h for the test images we have?

[zifeitong]

/ready

[zifeitong]

Thank you for the fix!

I assume this didn't get caught by our CI because this function itself wouldn't changew, h for the test images we have?

Yes. Normally _calc_hd_transform_size(_calc_hd_transform_size(w, h)) == _calc_hd_transform_size(w, h). That's why phi3-v model works fine. But we were calling _calc_hd_transform_size with different hd_num for phi-3.5v.

The test images sizes happen to work. I'll try add a regression test.

[WoosukKwon]

@zifeitong Thanks a lot for the quick bug fix!