pytorch_example.py

'''
 PyTorch - Image Classification with Convolutional Neural Networks

Use Case: Classifying satellite imagery or astronomical objects
'''

import torch
import torch.nn as nn
import torch.optim as optim
from torchvision import datasets, transforms

class CNN(nn.Module):
    def __init__(self, num_classes=10):
        super(CNN, self).__init__()
        self.conv1 = nn.Conv2d(3, 32, 3, padding=1)
        self.conv2 = nn.Conv2d(32, 64, 3, padding=1)
        self.pool = nn.MaxPool2d(2, 2)
        self.fc1 = nn.Linear(64 * 8 * 8, 512)
        self.fc2 = nn.Linear(512, num_classes)
        self.relu = nn.ReLU()
        
    def forward(self, x):
        x = self.pool(self.relu(self.conv1(x)))
        x = self.pool(self.relu(self.conv2(x)))
        x = x.view(-1, 64 * 8 * 8)
        x = self.relu(self.fc1(x))
        x = self.fc2(x)
        return x

# Training loop
model = CNN()
criterion = nn.CrossEntropyLoss()
optimizer = optim.Adam(model.parameters(), lr=0.001)