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#binary classifier that determines whether data points are from the original distribution or the fake (generated) distribution
class Discriminator(nn.Module):
  def __init__(self, input_dim=2, hidden_dim=28, n_layers=3):
    super(Discriminator,self).__init__()

    self.input = nn.Sequential( nn.Linear(input_dim, hidden_dim), nn.LeakyReLU() )
    self.layers = []
    for i in range(n_layers):
      self.layers.append( nn.Sequential( nn.Linear(hidden_dim, hidden_dim), nn.LeakyReLU() ) )
    

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z_dim = 10
num_epochs = 30000
batch_size = 32

device = torch.device("cuda" if (torch.cuda.is_available()) else "cpu")

criterion = nn.BCELoss()
gen = Generator(z_dim=z_dim, hidden_dim=28, n_layers=3, out_dim=2).to(device)
disc = Discriminator(input_dim=2, hidden_dim=28, n_layers=3).to(device)

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def parabolic_dist(x):
  return x*x

def inverse_parabolic_dist(x):
  return -(x*x)

def gauss_2d(mu=0, sigma=1):
    x = random.gauss(mu, sigma)
    y = random.gauss(mu, sigma)
    return (x, y)

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def run_experiment(model_name, model, optimizer, criterion, train_loader, val_loader, device='cuda', num_epochs=50, clear_mem=True):
    
    #######################
    #Train model          #
    #######################
    print('Model sent to ' + str(device))
    model.to(device)
    losses = []
    train_scores = [] # hold IoU scores
    iters = 0

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class ConvBlock(nn.Module):
    def __init__(self, in_channels, out_channels):
        super(ConvBlock, self).__init__()
        self.block = nn.Sequential(
            nn.Conv2d(in_channels, out_channels, kernel_size=3, stride=1, padding=1, bias=False),
            nn.BatchNorm2d(out_channels),
            nn.ReLU(inplace=True),
            nn.Conv2d(out_channels, out_channels, kernel_size=3, stride=1, padding=1, bias=False),
            nn.BatchNorm2d(out_channels),
            nn.ReLU(inplace=True)

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class Brain_MRI_Segmentation_Dataset(data.Dataset):
    def __init__(self, inputs, transform=None):
        self.inputs = inputs
        self.transform = transform
        self.input_dtype = torch.float32
        self.target_dtype = torch.float32
        
    def __len__(self):
        return len(self.inputs)
    

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transform = transforms.Compose([
    transforms.RandomHorizontalFlip(),
    transforms.RandomVerticalFlip(),
    transforms.RandomRotation(90),
    transforms.RandomAffine(degrees=15, translate=(0.1, 0.1), scale=(0.8, 0.8))
])

augmented_mri_dataset = Brain_MRI_Segmentation_Dataset(positive_diagnoses, transform=transform)

validation_size = int(0.3 * len(mri_dataset))

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1) do an `eb ssh` to your instance
2) find your django app in /var/app/current/
3) to activate the venv that elastic beanstalk creates: `source /var/app/venv/staging-*/bin/activate`
4) to grab any environment variables set in the evironment configuration: 
  `while IFS='=' read -r name value; do export "$name"="$value"; done < /opt/elasticbeanstalk/deployment/env`
5) `python manage.py shell` or whatever you want