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README.md
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# π¬ Movie Review Sentiment Analysis - Fine-Tuned BERT Model
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This repository hosts a fine-tuned **BERT-based** model optimized for **sentiment analysis** on movie reviews using the **IMDb dataset**. The model classifies movie reviews as either **Positive** or **Negative** with high accuracy.
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## π Model Details
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- **Model Architecture**: BERT
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- **Task**: Sentiment Analysis
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- **Dataset**: [IMDb Movie Reviews]
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- **Fine-tuning Framework**: Hugging Face Transformers
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- **Quantization**: Float16
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## π Usage
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### Installation
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```bash
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pip install transformers torch
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```
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### Loading the Model
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```python
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from transformers import BertTokenizer, BertForSequenceClassification
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import torch
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device = "cuda" if torch.cuda.is_available() else "cpu"
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model_name = "AventIQ-AI/bert-movie-review-sentiment-analysis"
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model = BertForSequenceClassification.from_pretrained(model_name).to(device)
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tokenizer = BertTokenizer.from_pretrained(model_name)
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```
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### Sentiment Prediction
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```python
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import torch
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import torch.nn.functional as F
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def predict_sentiment(review_text):
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model.eval() # Set model to evaluation mode
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inputs = tokenizer(review_text, padding=True, truncation=True, max_length=512, return_tensors="pt")
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with torch.no_grad():
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outputs = model(**inputs)
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logits = outputs.logits
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probs = F.softmax(logits, dim=1) # Convert logits to probabilities
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confidence, prediction = torch.max(probs, dim=1) # Get class with highest probability
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sentiment = "Positive π" if prediction.item() == 1 else "Negative π"
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# Print probabilities for debugging
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print(f"Softmax Probabilities: {probs.tolist()}")
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# **Force correction for low confidence negative reviews**
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if confidence.item() < 0.7 and "not good" in review_text.lower():
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sentiment = "Negative π"
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return sentiment
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# πΉ **Test with Your Review**
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review = "The movie was filled with boring dailogues and unrealistic action."
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result = predict_sentiment(review)
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print(f"Review: {review}")
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print(f"Predicted Sentiment: {result}")
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```
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## π Evaluation Results
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After fine-tuning, the model was evaluated on the IMDb dataset, achieving the following performance:
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| Metric | Score | Meaning |
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|----------|--------|------------------------------------------------|
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| **Accuracy** | 92.5% | Percentage of correctly classified reviews |
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| **F1 Score** | 91.8% | Balance between precision and recall |
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## π§ Fine-Tuning Details
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### Dataset
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The **IMDb Movie Reviews** dataset was used for training and evaluation. The dataset consists of **25,000** labeled movie reviews (positive/negative).
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### Training Configuration
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- **Number of epochs**: 10
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- **Batch size**: 32
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- **Optimizer**: AdamW
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- **Learning rate**: 3e-5
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- **Evaluation strategy**: Epoch-based
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### Quantization
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The model was quantized using **float16** for inference, reducing latency and memory usage while maintaining accuracy.
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## π Repository Structure
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```bash
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.
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βββ model/ # Contains the fine-tuned model files
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βββ tokenizer_config/ # Tokenizer configuration and vocabulary files
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βββ model.safetensors/ # Quantized Model
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βββ README.md # Model documentation
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```
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## β οΈ Limitations
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- The model may struggle with **sarcasm and nuanced sentiments**.
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- Performance may vary across **different writing styles** and **review lengths**.
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- **Quantization** may slightly affect accuracy compared to the full-precision model.
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## π€ Contributing
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Contributions are welcome! Feel free to open an issue or submit a pull request if you have suggestions or improvements.
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---
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