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The process of building a PyTorch model using HuggingFace library that consists of multiple transformers usually involves the following steps:

1. Prepare the Data: The first step is to prepare the data that will be used to train the model. This usually involves preprocessing the data by converting it into a format that can be fed into the model.

2. Choose the Transformers: Next, choose the transformers that will be used to build the model. This decision is often based on the type of task that the model needs to perform.

3. Pretrain the Transformers: Once the transformers are chosen, they need to be pretrained on a dataset. Pretraining the transformers involves feeding them a large amount of data to learn from.

4. Fine-tune the Model: Once the transformers are pretrained, fine-tuning the model involves training the entire model on a smaller dataset that is specific to the task the model needs to perform.

5. Evaluate the Model: Finally, the model needs to be evaluated to determine its accuracy and effectiveness in solving the problem it was created for.

Throughout the entire process, it can be helpful to use tools and libraries provided by HuggingFace to speed up development and make it easier to build and evaluate the model.