import torch, torchvision
from torch import nn

def build_effnetb1():
    # weight & model initialization
    effnetb1_weights = torchvision.models.EfficientNet_B1_Weights.DEFAULT
    effnetb1 = torchvision.models.efficientnet_b1(weights=effnetb1_weights)
    effnetb1_transforms = effnetb1_weights.transforms()
    effnetb1.name = "effnetb1"

    # Freeze params
    for params in effnetb1.parameters():
        params.requires_grad = False

    # Edit Classifiers
    effnetb1.classifier = torch.nn.Sequential(
        nn.Dropout(p=0, inplace=True),
        nn.Linear(in_features=1280,
                  out_features=4,
                  bias=True).to("cpu")
    )

    return effnetb1, effnetb1_transforms