model.py

from huggingface_hub import PyTorchModelHubMixin
from torch import nn

class SurfinBird(nn.Module, PyTorchModelHubMixin):
  def __init__(self, config: dict) -> None:
    super().__init__()
    self.conv1 = nn.Conv2d(
            in_channels=config["num_channels"],
            out_channels=64,
            kernel_size=7,
            stride=2,
            padding=3)
    self.bn1 = nn.BatchNorm2d(64)
    self.relu1 = nn.ReLU()
    self.mp1 = nn.MaxPool2d(kernel_size=2,
                     stride=2)
    self.conv_block_2 = nn.Sequential(
        nn.Conv2d(
            in_channels=64,
            out_channels=64,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(64),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=64,
            out_channels=64,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(64),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=64,
            out_channels=64,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(64),
        nn.ReLU(),
        nn.MaxPool2d(kernel_size=2,
                     stride=2)
    )
    self.conv_block_3 = nn.Sequential(
        nn.Conv2d(
            in_channels=64,
            out_channels=128,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(128),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=128,
            out_channels=128,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(128),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=128,
            out_channels=128,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(128),
        nn.ReLU(),
        nn.MaxPool2d(kernel_size=2,
                     stride=2)
    )
    self.conv_block_4 = nn.Sequential(
        nn.Conv2d(
            in_channels=128,
            out_channels=128,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(128),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=128,
            out_channels=128,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(128),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=128,
            out_channels=128,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(128),
        nn.ReLU(),
        nn.MaxPool2d(kernel_size=2,
                     stride=2)
    )
    self.conv_block_5 = nn.Sequential(
        nn.Conv2d(
            in_channels=128,
            out_channels=256,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(256),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=256,
            out_channels=256,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(256),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=256,
            out_channels=256,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(256),
        nn.ReLU(),
        nn.MaxPool2d(kernel_size=2,
                     stride=2)
    )
    self.conv_block_6 = nn.Sequential(
        nn.Conv2d(
            in_channels=256,
            out_channels=256,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(256),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=256,
            out_channels=256,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(256),
        nn.ReLU(),
        nn.Conv2d(
            in_channels=256,
            out_channels=256,
            kernel_size=3,
            stride=1,
            padding=1
        ),
        nn.BatchNorm2d(256),
        nn.ReLU(),
        nn.MaxPool2d(kernel_size=2,
                     stride=2)
    )

    self.avgpool = nn.Sequential(
    nn.AdaptiveAvgPool2d(output_size=(1, 1))
    )

    self.classifier = nn.Sequential(
        nn.Flatten(),
        nn.Linear(in_features=config["hidden_units"]*1*1,
                  out_features=config["num_classes"])
    )
  def forward(self, x: torch.Tensor):
    return self.classifier(self.avgpool(self.conv_block_6(self.conv_block_5(self.conv_block_4(self.conv_block_3(self.conv_block_2(self.mp1(self.relu1(self.bn1(self.conv1(x)))))))))))

config = {"num_channels": 3, "hidden_units": 256, "num_classes": 525}