SigLIP and canonicalize

Сould you please clarify if canonicalization had been used during SigLIP **training**?

This demo https://github.com/google-research/big_vision/blob/main/big_vision/configs/proj/image_text/SigLIP_demo.ipynb does not use canonicalization.

But canonicalization used in this script https://github.com/google-research/big_vision/blob/main/big_vision/evaluators/proj/image_text/prompt_engineering.py

Start by comparing big_vision/configs/proj/image_text/SigLIP_demo.ipynb with big_vision/evaluators/proj/image_text/prompt_engineering.py, focusing on where canonicalization is referenced. Done means documenting whether canonicalization was used during SigLIP training and explaining the difference between the training demo and evaluation script.

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