changed the import order of the model and configuration classes and a…

[madhubabu147]

…dded comment before model initialization line and Add configuration_[model_name].py to utils/documentation_tests.txt

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Fixes # (issue)

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[madhubabu147]

changed the import order of the model and configuration classes and added comment before model initialization line and Add configuration_[model_name].py to utils/documentation_tests.txt #19487

[ydshieh]

Hi.

It's unclear to me the reason behind the changes in this PR.

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