import torch
import torch.nn as nn
from torchvision.models import mobilenet_v3_small

class MobileNetV3SmallClassifier(nn.Module):
    def __init__(self, num_classes=5, pretrained=True):
        super().__init__()
        self.backbone = mobilenet_v3_small(pretrained=pretrained)
        in_features = self.backbone.classifier[3].in_features
        self.backbone.classifier[3] = nn.Linear(in_features, num_classes)
    def forward(self, x):
        return self.backbone(x)