Fix optional chaining for batch size calculation in PreTrainedModel

[emojiiii]

[emojiiii]

This pull request includes a minor change to the PreTrainedModel class in the src/models.js file. The change improves the robustness of the code by using optional chaining to handle undefined values more gracefully.

• src/models.js: Modified the batch_size calculation to use optional chaining for accessing dims property, ensuring the code handles cases where dims might be undefined.

[xenova]

Thanks for the PR! Can you provide the sample code which produces the error?

[emojiiii]

Thanks for the PR! Can you provide the sample code which produces the error?

I found this when running the example code

[xenova]

Thanks! I can confirm this fixes the issue.

[HuggingFaceDocBuilderDev]

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