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Add config tip to custom model docs (#28601)

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Add tip to custom model docs
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docs/source/en/custom_models.md
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@ -34,6 +34,16 @@ Before we dive into the model, let's first write its configuration. The configur
will contain all the necessary information to build the model. As we will see in the next section, the model can only will contain all the necessary information to build the model. As we will see in the next section, the model can only
take a `config` to be initialized, so we really need that object to be as complete as possible. take a `config` to be initialized, so we really need that object to be as complete as possible.
<Tip>
Models in the `transformers` library itself generally follow the convention that they accept a `config` object
in their `__init__` method, and then pass the whole `config` to sub-layers in the model, rather than breaking the
config object into multiple arguments that are all passed individually to sub-layers. Writing your model in this
style results in simpler code with a clear "source of truth" for any hyperparameters, and also makes it easier
to reuse code from other models in `transformers`.
</Tip>
In our example, we will take a couple of arguments of the ResNet class that we might want to tweak. Different In our example, we will take a couple of arguments of the ResNet class that we might want to tweak. Different
configurations will then give us the different types of ResNets that are possible. We then just store those arguments, configurations will then give us the different types of ResNets that are possible. We then just store those arguments,
after checking the validity of a few of them. after checking the validity of a few of them.