Lære Setting Up for Fine-Tuning | Fine-Tuning Transformer Models

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To fine-tune a transformer model for a classification task, you need to follow a clear workflow. The main steps are:

Load the pre-trained model and tokenizer;
Prepare your dataset;
Define the training arguments for the fine-tuning process.

Begin by selecting a suitable pre-trained checkpoint, such as a BERT model for sequence classification. Next, ensure your data is properly formatted and preprocessed so it can be easily fed into the model. Finally, set up your training parameters, including batch size, learning rate, and number of epochs, to control how the model learns from your data.

Note

Always use the same checkpoint for both the model and the tokenizer. This ensures that the tokenization matches the model's expected input format and prevents compatibility issues.


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from transformers import AutoModelForSequenceClassification, AutoTokenizer

# Load BERT model and tokenizer from the same checkpoint
checkpoint = "bert-base-uncased"
model = AutoModelForSequenceClassification.from_pretrained(checkpoint, num_labels=2)
tokenizer = AutoTokenizer.from_pretrained(checkpoint)

# Model and tokenizer are now ready for fine-tuning

Using the same checkpoint for both the model and the tokenizer is essential for smooth fine-tuning. If you load a model and tokenizer from different checkpoints, you may encounter unexpected errors during training or inference because the vocabulary and tokenization scheme may not align with the model's learned parameters.

Note

Loading a tokenizer and model from different checkpoints can cause input errors, such as shape mismatches or unknown tokens, leading to failed training runs or poor model performance.

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