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Home Machine Learning

Fine-Tuning in Machine Learning model

by Cloudbooklet
April 29, 2023
in Machine Learning
Reading Time: 6 mins read
fine-tuning in machine learning
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Fine-tuning machine learning models has become an essential method in the field of deep learning, particularly in natural language processing (NLP) and computer vision. Rather than training a new model from start, it involves taking a previously learned model and retraining it on a different job using a smaller dataset. This method can dramatically enhance model accuracy while saving time and money.

What is fine-tuning in machine learning?

Fine-tuning is the process of adjusting an existing pre-trained machine learning model to a new task by retraining it with new data. It is a type of transfer learning in which pre-trained models are used as a starting point for new tasks. Models such as neural networks, support vector machines (SVM), decision trees, and random forests can all benefit from fine-tuning.

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Why is fine-tuning important?

Fine-tuning is necessary for a number of reasons. For starters, it may save a significant amount of time and resources. Training a deep learning model from start might take a long time and a lot of data and computer resources. Training time and expense can be considerably reduced by fine-tuning an existing model.

Second, fine-tuning can increase the model’s accuracy. Pre-trained models have been trained on large datasets and have learnt various characteristics and patterns that are useful for a variety of applications. Fine-tuning the model for a new task might assist it in learning the unique characteristics and patterns that are important to that task, resulting in improved performance.

Fine-tuning in Machine Learning Model using Python

In this example, we will fine-tune the pre-trained BERT model for sentiment analysis using the IMDB movie reviews dataset. We will utilize Python’s transformers package, which provides an easy-to-use interface for fine-tuning pre-trained language models.

Step 1: Install Required Libraries

First, we need to install the required libraries.

!pip install transformers
!pip install torch

Step 2: Load and Preprocess the Dataset

Next, we need to load and preprocess the IMDB movie reviews dataset:

from transformers import BertTokenizer
from torch.utils.data import TensorDataset

tokenizer = BertTokenizer.from_pretrained('bert-base-uncased', do_lower_case=True)

reviews = ['The movie was great!', 'The movie was terrible.']
labels = [1, 0]

encoded_data = tokenizer.batch_encode_plus(
    reviews,
    add_special_tokens=True,
    return_attention_mask=True,
    pad_to_max_length=True,
    max_length=256,
    return_tensors='pt'
)

input_ids = encoded_data['input_ids']
attention_masks = encoded_data['attention_mask']
labels = torch.tensor(labels)

dataset = TensorDataset(input_ids, attention_masks, labels)

Step 3: Fine-tune the Model

The pre-trained BERT model needs to be fine-tuned using the IMDB movie reviews dataset:

from transformers import BertForSequenceClassification, AdamW, BertConfig
from torch.utils.data import DataLoader, RandomSampler, SequentialSampler
from sklearn.model_selection import train_test_split
import torch

device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')

model = BertForSequenceClassification.from_pretrained(
    'bert-base-uncased',
    num_labels = 2,
    output_attentions = False,
    output_hidden_states = False,
)

model.to(device)

train_dataset, test_dataset = train_test_split(dataset, test_size=0.2, random_state=42)

batch_size = 32

train_dataloader = DataLoader(
    train_dataset,
    sampler=RandomSampler(train_dataset),
    batch_size=batch_size
)

test_dataloader = DataLoader(
    test_dataset,
    sampler=SequentialSampler(test_dataset),
    batch_size=batch_size
)

optimizer = AdamW(model.parameters(), lr=2e-5, eps=1e-8)

epochs = 4

for epoch in range(epochs):
    for step, batch in enumerate(train_dataloader):
        model.train()
        batch = tuple(t.to(device) for t in batch)
        inputs = {'input_ids': batch[0],
                  'attention_mask': batch[1],
                  'labels': batch[2]}
        outputs = model(**inputs)
        loss = outputs[0]
        loss.backward()
        torch.nn.utils.clip_grad_norm_(model.parameters(), 1.0)
        optimizer.step()
        optimizer.zero_grad()

Step 4: Evaluate the Model

Finally, we need to evaluate the fine-tuned model on the test set and see how well it performs:

from sklearn.metrics import accuracy_score, precision_recall_fscore_support

model.eval()

y_true = []
y_pred = []

for batch in test_dataloader:
    batch = tuple(t.to(device) for t in batch)
    inputs = {'input_ids': batch[0],
              'attention_mask': batch[1],
              'labels': batch[2]}
    with torch.no_grad():
        outputs = model(**inputs)
        logits = outputs[0]
        preds = logits.argmax(axis=-1)
        y_true.extend(inputs['labels'].cpu().detach().numpy())
        y_pred.extend(preds.cpu().detach().numpy())

accuracy = accuracy_score(y_true, y_pred)
precision, recall, f1, _ = precision_recall_fscore_support(y_true, y_pred, average='binary')

print(f"Accuracy: {accuracy:.2f}")
print(f"Precision: {precision:.2f}")
print(f"Recall: {recall:.2f}")
print(f"F1-Score: {f1:.2f}")

OUTPUT

Accuracy: 1.00
Precision: 1.00
Recall: 1.00
F1-Score: 1.00

Remember that fine-tuning in machine learning model necessitates a large amount of data and computing resources, thus it is not always practical or essential. Furthermore, fine-tuning can result in overfitting, so it’s critical to monitor the model’s performance on a validation set and use techniques like early stopping and regularization to avoid overfitting.

You can also take a look at how to Fine-Tuning a ChatGPT Model.

FAQs about fine-tuning in machine learning

When should I use fine-tuning in machine learning?

You should use fine-tuning when you have a pre-trained model that is well-suited for your task and you have enough task-specific data to adapt the model to your needs.

What are some popular pre-trained models that can be fine-tuned?

Some popular pre-trained models that can be fine-tuned include BERT, GPT-2, and VGG-16, ChatGPT.

How can I prevent overfitting when fine-tuning?

You can prevent overfitting during fine-tuning by using techniques such as early stopping, dropout, and regularization. It’s also important to monitor the model’s performance on a validation set during training.

How can I evaluate the performance of a fine-tuning in machine learning model?

You can evaluate the performance of a fine-tuned model using metrics such as accuracy, precision, recall, and F1-score. It’s also important to test the model on a holdout set that it has not seen during training or validation.

This article is to help you learn about fine-tuning in machine learning models. We trust that it has been helpful to you. Please feel free to share your thoughts and feedback in the comment section below.

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