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Version 8

Course Project - Train a Deep Learning Model from Scratch

1. Dataset

  • The dataset is from kaggle, CelebFaces Attributes (CelebA) Dataset with Over 200k images of celebrities with 40 binary attribute annotations.
  • We have utilised only images to train our model.
  • Link to dataset page on kaggle https://www.kaggle.com/jessicali9530/celeba-dataset
In [ ]:
# prject name
project_name = 'course-project-humanface-dcgan'
In [ ]:
# install opendatasets module 
!pip install opendatasets --upgrade --quiet
In [ ]:
# downloading dataset
import opendatasets as od

dataset_url = 'https://www.kaggle.com/jessicali9530/celeba-dataset'
od.download(dataset_url)
0%| | 5.00M/1.33G [00:00<00:39, 35.8MB/s]
Downloading celeba-dataset.zip to ./celeba-dataset
100%|██████████| 1.33G/1.33G [00:17<00:00, 80.8MB/s]

The dataset has a single folder which contains all 200k images in JPG format and few csv files containing binary attribute annotations.

In [ ]:
# checking up directory
import os

DATA_DIR = '/content/celeba-dataset/img_align_celeba'
print(os.listdir(DATA_DIR))
['images', '.ipynb_checkpoints']
In [ ]:
# listing few images from dataset
print(os.listdir(DATA_DIR+'/images')[:10])
['169176.jpg', '107803.jpg', '001507.jpg', '199394.jpg', '080649.jpg', '163543.jpg', '119611.jpg', '070090.jpg', '178744.jpg', '058965.jpg']

2. Modelling Objective

** What type of data is it? **

  • The data contains the images of faces & csv file conatining attributes.

** What type of problem is it? **

  • The type of problem we are solving is generative modelling where we are training our model to generate faces of people.

3. Data Preprocessing & EDA

In [ ]:
# import essential modules
from torch.utils.data import DataLoader
from torchvision.datasets import ImageFolder
import torchvision.transforms as T
In [ ]:
# define image size , batch size normaliozation parameters 
image_size = 64
batch_size = 128
stats = (0.5, 0.5, 0.5), (0.5, 0.5, 0.5)
In [ ]:
# performing image transformations
train_ds = ImageFolder(DATA_DIR, transform=T.Compose([
    T.Resize(image_size),
    T.CenterCrop(image_size),
    T.ToTensor(),
    T.Normalize(*stats)]))

train_dl = DataLoader(train_ds, batch_size, shuffle=True, num_workers=3, pin_memory=True)

Let's create helper functions to denormalize the image tensors and display some sample images from a training batch.

In [ ]:
import torch
from torchvision.utils import make_grid
import matplotlib.pyplot as plt
%matplotlib inline
In [ ]:
# function to denormalize images 
def denorm(img_tensors):
    return img_tensors * stats[1][0] + stats[0][0]
In [ ]:
# function to show images
def show_images(images, nmax=64):
    fig, ax = plt.subplots(figsize=(8, 8))
    ax.set_xticks([]); ax.set_yticks([])
    ax.imshow(make_grid(denorm(images.detach()[:nmax]), nrow=8).permute(1, 2, 0))

def show_batch(dl, nmax=64):
    for images, _ in dl:
        show_images(images, nmax)
        break
In [ ]:
# let's see few images 
show_batch(train_dl)
Notebook Image
In [ ]:
!pip install jovian --upgrade --quiet
In [ ]:
import jovian
In [62]:
jovian.commit(project=project_name, environment=None)
[jovian] Detected Colab notebook... [jovian] Uploading colab notebook to Jovian... [jovian] Attaching records (metrics, hyperparameters, dataset etc.) [jovian] Committed successfully! https://jovian.ai/junaidkhangec/course-project-humanface-dcgan
Out[62]:
'https://jovian.ai/junaidkhangec/course-project-humanface-dcgan'

4. Modelling

A. Creating Dataloader

In [ ]:
def get_default_device():
    """Pick GPU if available, else CPU"""
    if torch.cuda.is_available():
        return torch.device('cuda')
    else:
        return torch.device('cpu')
    
def to_device(data, device):
    """Move tensor(s) to chosen device"""
    if isinstance(data, (list,tuple)):
        return [to_device(x, device) for x in data]
    return data.to(device, non_blocking=True)

class DeviceDataLoader():
    """Wrap a dataloader to move data to a device"""
    def __init__(self, dl, device):
        self.dl = dl
        self.device = device
        
    def __iter__(self):
        """Yield a batch of data after moving it to device"""
        for b in self.dl: 
            yield to_device(b, self.device)

    def __len__(self):
        """Number of batches"""
        return len(self.dl)
In [ ]:
# get default device ('cuda' if GPU available) 
device = get_default_device()
device
Out[]:
device(type='cuda')

We can now move our training data loader using DeviceDataLoader for automatically transferring batches of data to the GPU (if available).

In [ ]:
# moving data on default device (on GPU if available)
train_dl = DeviceDataLoader(train_dl, device)

B. Defining Model Architecture

1. Discriminator Architecture
In [ ]:
import torch.nn as nn
In [ ]:
discriminator = nn.Sequential(
    # in: 3 x 64 x 64

    nn.Conv2d(3, 64, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(64),
    nn.LeakyReLU(0.2, inplace=True),
    # out: 64 x 32 x 32

    nn.Conv2d(64, 128, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(128),
    nn.LeakyReLU(0.2, inplace=True),
    # out: 128 x 16 x 16

    nn.Conv2d(128, 256, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(256),
    nn.LeakyReLU(0.2, inplace=True),
    # out: 256 x 8 x 8

    nn.Conv2d(256, 512, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(512),
    nn.LeakyReLU(0.2, inplace=True),
    # out: 512 x 4 x 4

    nn.Conv2d(512, 1, kernel_size=4, stride=1, padding=0, bias=False),
    # out: 1 x 1 x 1

    nn.Flatten(),
    nn.Sigmoid())
In [ ]:
# moving discriminator model to GPU (if available)
discriminator = to_device(discriminator, device)
2. Generator Architecture
In [ ]:
# defininf size of the input noice to generator model
latent_size = 128
In [ ]:
generator = nn.Sequential(
    # in: latent_size x 1 x 1

    nn.ConvTranspose2d(latent_size, 512, kernel_size=4, stride=1, padding=0, bias=False),
    nn.BatchNorm2d(512),
    nn.ReLU(True),
    # out: 512 x 4 x 4

    nn.ConvTranspose2d(512, 256, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(256),
    nn.ReLU(True),
    # out: 256 x 8 x 8

    nn.ConvTranspose2d(256, 128, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(128),
    nn.ReLU(True),
    # out: 128 x 16 x 16

    nn.ConvTranspose2d(128, 64, kernel_size=4, stride=2, padding=1, bias=False),
    nn.BatchNorm2d(64),
    nn.ReLU(True),
    # out: 64 x 32 x 32

    nn.ConvTranspose2d(64, 3, kernel_size=4, stride=2, padding=1, bias=False),
    nn.Tanh()
    # out: 3 x 64 x 64
)
In [ ]:
# testing generator model before training
xb = torch.randn(batch_size, latent_size, 1, 1) # random latent tensors
fake_images = generator(xb)
print(fake_images.shape)
show_images(fake_images)
torch.Size([128, 3, 64, 64])