Cat_or_Dog.Classifier

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🐾 Cat vs Dog Classifier

This model is a deep convolutional neural network (CNN) built using PyTorch to classify images as either cats or dogs. It was trained on a labeled dataset of cat and dog images resized to 224×224 pixels, with extensive data augmentation and regularization techniques to improve generalization. The model achieves over 90% accuracy on the test set.

🧠 Model Overview

The classifier consists of four convolutional blocks followed by three fully connected layers. Each convolutional block includes a convolutional layer, batch normalization, ReLU activation, and max pooling. The fully connected layers include batch normalization and dropout for regularization.

Convolutional Feature Extractor

• Conv Block 1:

  • Input channels: 3 (RGB)
  • Output channels: 64
  • Kernel size: 3 × 3
  • BatchNorm + ReLU + MaxPool (2 × 2)

• Conv Block 2:

  • Input channels: 64
  • Output channels: 128
  • Kernel size: 3 × 3
  • BatchNorm + ReLU + MaxPool (2 × 2)

• Conv Block 3:

  • Input channels: 128
  • Output channels: 256
  • Kernel size: 3 × 3
  • BatchNorm + ReLU + MaxPool (2 × 2)

• Conv Block 4:

  • Input channels: 256
  • Output channels: 512
  • Kernel size: 3 × 3
  • BatchNorm + ReLU + MaxPool (2 × 2)

After these blocks, the feature map is flattened to a 1D vector for classification.

Fully Connected Classifier

• FC Layer 1:

  • Input: Flattened feature vector
  • Output: 512 units
  • BatchNorm + ReLU + Dropout (p=0.5)

• FC Layer 2:

  • Input: 512 units
  • Output: 256 units
  • BatchNorm + ReLU + Dropout (p=0.5)

• FC Layer 3:

  • Input: 256 units
  • Output: 2 units (cat or dog)

🧪 Training Details

• Framework: PyTorch
• Input size: 224 × 224 RGB images
• Optimizer: Adam with learning rate 0.0001 and weight decay 1e-4
• Loss Function: CrossEntropyLoss
• Scheduler: ReduceLROnPlateau (monitors validation accuracy)
• Epochs: 40
• Batch Size: 32
• Validation Split: 20% of training data
• Best Validation Accuracy: 90.26%
• Final Test Accuracy: 90.56%

🎨 Data Augmentation

To improve generalization, the training data was augmented with:

• Random horizontal flips
• Random rotations (±10 degrees)
• Color jitter (brightness and contrast)
• Normalization using ImageNet mean and standard deviation

📄 License

This model is licensed under the Apache 2.0 License. You are free to use, modify, and distribute it with proper attribution.

🙋 Author

Created by Sathvik as part of a deep learning exploration project focused on image classification and CNN architecture optimization.