Merged commit includes the following changes:

326478470  by iftenney:

    Fix unbatching issue and tidy up code for GPT-2 demo

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326478303  by iftenney:

    Fix frontend error if no token input is available

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326465488  by jwexler:

    Allow setting of hostname used by werkzeug

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326434919  by jwexler:

    LM prediction module: reset masked token on example switch

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326347597  by jwexler:

    Clean up README

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326347174  by jwexler:

    Update README for LIT paper

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326346943  by iftenney:

    Fix tokenization bug in click-to-mask mode for MLM

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326345968  by iftenney:

    Safer max_length handling for GLUE classifier

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326339730  by iftenney:

    Set default layout for LM demo

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326338272  by iftenney:

    Internal change

326284480  by iftenney:

    Internal change

326278999  by iftenney:

    Internal change

326230051  by jwexler:

    Internal change

PiperOrigin-RevId: 326478470