import torch.nn as nn
import torchvision.transforms as transforms


class AlexNetOWT_BN(nn.Module):

    def __init__(self, num_classes=1000):
        super(AlexNetOWT_BN, self).__init__()
        self.features = nn.Sequential(
            nn.Conv2d(3, 128, kernel_size=3, stride=1, padding=1,
                      bias=False),
            nn.BatchNorm2d(128),
            nn.ReLU(inplace=True),

            nn.Conv2d(128, 128, kernel_size=3, padding=1, bias=False),
            nn.MaxPool2d(kernel_size=2, stride=2),
            nn.ReLU(inplace=True),
            nn.BatchNorm2d(128),

            nn.Conv2d(128, 256, kernel_size=3, padding=1, bias=False),
            nn.ReLU(inplace=True),
            nn.BatchNorm2d(256),

            nn.Conv2d(256, 256, kernel_size=3, padding=1, bias=False),
            nn.MaxPool2d(kernel_size=2, stride=2),
            nn.ReLU(inplace=True),
            nn.BatchNorm2d(256),

            nn.Conv2d(256, 512, kernel_size=3, padding=1, bias=False),
            nn.ReLU(inplace=True),
            nn.BatchNorm2d(512),

            nn.Conv2d(512, 512, kernel_size=3, padding=1, bias=False),
            nn.MaxPool2d(kernel_size=2, stride=2),
            nn.ReLU(inplace=True),
            nn.BatchNorm2d(512),
        )
        self.classifier = nn.Sequential(
            nn.Linear(512 * 4 * 4, 1024, bias=False),
            nn.BatchNorm1d(1024),
            nn.ReLU(inplace=True),
            nn.Dropout(0.5),
            nn.Linear(1024, 1024, bias=False),
            nn.BatchNorm1d(1024),
            nn.ReLU(inplace=True),
            nn.Dropout(0.5),
            nn.Linear(1024, num_classes)
            nn.LogSoftMax()
        )

        self.regime = {
            0: {'optimizer': 'SGD', 'lr': 1e-2,
                'weight_decay': 5e-4, 'momentum': 0.9},
            10: {'lr': 5e-3},
            15: {'lr': 1e-3, 'weight_decay': 0},
            20: {'lr': 5e-4},
            25: {'lr': 1e-4}
        }

    def forward(self, x):
        x = self.features(x)
        x = x.view(-1, 512 * 4 * 4)
        x = self.classifier(x)
        return x


def model(**kwargs):
    num_classes = getattr(kwargs,'num_classes', 1000)
    return AlexNetOWT_BN(num_classes)
