"""Define the model architecture."""

from torch import nn


# pylint: disable=unsubscriptable-object,too-many-instance-attributes
class CNNModel(nn.Module):
    """Model for benchmark experiment on Digits."""

    def __init__(self, num_classes=10):
        super().__init__()
        self.conv1 = nn.Conv2d(3, 64, 5, 1, 2)
        self.bn1 = nn.BatchNorm2d(64)
        self.conv2 = nn.Conv2d(64, 64, 5, 1, 2)
        self.bn2 = nn.BatchNorm2d(64)
        self.conv3 = nn.Conv2d(64, 128, 5, 1, 2)
        self.bn3 = nn.BatchNorm2d(128)

        self.fc1 = nn.Linear(6272, 2048)
        self.bn4 = nn.BatchNorm1d(2048)
        self.fc2 = nn.Linear(2048, 512)
        self.bn5 = nn.BatchNorm1d(512)
        self.fc3 = nn.Linear(512, num_classes)

    # pylint: disable=arguments-differ,invalid-name
    def forward(self, x):
        """Forward pass."""
        x = nn.functional.relu(self.bn1(self.conv1(x)))
        x = nn.functional.max_pool2d(x, 2)

        x = nn.functional.relu(self.bn2(self.conv2(x)))
        x = nn.functional.max_pool2d(x, 2)

        x = nn.functional.relu(self.bn3(self.conv3(x)))

        x = x.view(x.shape[0], -1)

        x = self.fc1(x)
        x = self.bn4(x)
        x = nn.functional.relu(x)

        x = self.fc2(x)
        x = self.bn5(x)
        x = nn.functional.relu(x)

        x = self.fc3(x)
        return x
