Created
August 10, 2023 11:41
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Lightning Script
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# main.py | |
# ! pip install torchvision | |
import torch, torch.nn as nn, torch.utils.data as data, torchvision as tv, torch.nn.functional as F | |
import lightning as L | |
# -------------------------------- | |
# Step 1: Define a LightningModule | |
# -------------------------------- | |
# A LightningModule (nn.Module subclass) defines a full *system* | |
# (ie: an LLM, diffusion model, autoencoder, or simple image classifier). | |
class LitAutoEncoder(L.LightningModule): | |
def __init__(self): | |
super().__init__() | |
self.encoder = nn.Sequential(nn.Linear(28 * 28, 128), nn.ReLU(), nn.Linear(128, 3)) | |
self.decoder = nn.Sequential(nn.Linear(3, 128), nn.ReLU(), nn.Linear(128, 28 * 28)) | |
def forward(self, x): | |
# in lightning, forward defines the prediction/inference actions | |
embedding = self.encoder(x) | |
return embedding | |
def training_step(self, batch, batch_idx): | |
# training_step defines the train loop. It is independent of forward | |
x, y = batch | |
x = x.view(x.size(0), -1) | |
z = self.encoder(x) | |
x_hat = self.decoder(z) | |
loss = F.mse_loss(x_hat, x) | |
self.log("train_loss", loss) | |
return loss | |
def configure_optimizers(self): | |
optimizer = torch.optim.Adam(self.parameters(), lr=1e-3) | |
return optimizer | |
# ------------------- | |
# Step 2: Define data | |
# ------------------- | |
def prepare_data(self): | |
tv.datasets.MNIST(".", download=True) | |
def setup(self, stage): | |
dataset = tv.datasets.MNIST(".", transform=tv.transforms.ToTensor()) | |
self.train_dataset, self.val_dataset = data.random_split(dataset, [55000, 5000]) | |
def train_dataloader(self): | |
return data.DataLoader(self.train_dataset) | |
def val_dataloader(self): | |
return data.DataLoader(self.val_dataset) | |
# ------------------- | |
# Step 3: Train | |
# ------------------- | |
autoencoder = LitAutoEncoder() | |
trainer = L.Trainer() | |
trainer.fit(autoencoder) |
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