import torch
import torchvision
from torch import nn

def create_effnetb2_model(num_classes:int=3,
                          seed:int=42):
    """Creates an EfficientNet-B2 feature extractor model and transforms."""
    weights = torchvision.models.EfficientNet_B2_Weights.DEFAULT
    transforms = weights.transforms()
    model = torchvision.models.efficientnet_b2(weights=weights)

    for param in model.parameters():
        param.requires_grad = False

    
    torch.manual_seed(seed)

    model.classifier = nn.Sequential(
        nn.Dropout(p=0.3, inplace=True),
        nn.Linear(in_features=1408, out_features=num_classes, bias=True)
    )

    return model, transforms