diff --git a/model/base/__init__.py b/model/base/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/model/base/module.py b/model/base/module.py
new file mode 100644
index 0000000..d0c6da6
--- /dev/null
+++ b/model/base/module.py
@@ -0,0 +1,109 @@
+import torch.nn as nn
+
+from model.registry import NORMALIZATION
+
+_DO_NO_THING_FUNC = lambda x: x
+
+
+def _use_bias_checker(norm_type):
+    return norm_type not in ["IN", "BN", "AdaIN", "FADE", "SPADE"]
+
+
+def _normalization(norm, num_features, additional_kwargs=None):
+    if norm == "NONE":
+        return _DO_NO_THING_FUNC
+
+    if additional_kwargs is None:
+        additional_kwargs = {}
+    kwargs = dict(_type=norm, num_features=num_features)
+    kwargs.update(additional_kwargs)
+    return NORMALIZATION.build_with(kwargs)
+
+
+def _activation(activation):
+    if activation == "NONE":
+        return _DO_NO_THING_FUNC
+    elif activation == "ReLU":
+        return nn.ReLU(inplace=True)
+    elif activation == "LeakyReLU":
+        return nn.LeakyReLU(negative_slope=0.2, inplace=True)
+    elif activation == "Tanh":
+        return nn.Tanh()
+    else:
+        raise NotImplemented(activation)
+
+
+class Conv2dBlock(nn.Module):
+    def __init__(self, in_channels: int, out_channels: int, bias=None,
+                 activation_type="ReLU", norm_type="NONE", **conv_kwargs):
+        super().__init__()
+        self.norm_type = norm_type
+        self.activation_type = activation_type
+
+        # if caller not set bias, set bias automatically.
+        conv_kwargs["bias"] = _use_bias_checker(norm_type) if bias is None else bias
+
+        self.convolution = nn.Conv2d(in_channels, out_channels, **conv_kwargs)
+        self.normalization = _normalization(norm_type, out_channels)
+        self.activation = _activation(activation_type)
+
+    def forward(self, x):
+        return self.activation(self.normalization(self.convolution(x)))
+
+
+class ResidualBlock(nn.Module):
+    def __init__(self, num_channels, out_channels=None, padding_mode='reflect',
+                 activation_type="ReLU", out_activation_type=None, norm_type="IN"):
+        super().__init__()
+        self.norm_type = norm_type
+
+        if out_channels is None:
+            out_channels = num_channels
+        if out_activation_type is None:
+            out_activation_type = "NONE"
+
+        self.learn_skip_connection = num_channels != out_channels
+
+        self.conv1 = Conv2dBlock(num_channels, num_channels, kernel_size=3, padding=1, padding_mode=padding_mode,
+                                 norm_type=norm_type, activation_type=activation_type)
+        self.conv2 = Conv2dBlock(num_channels, out_channels, kernel_size=3, padding=1, padding_mode=padding_mode,
+                                 norm_type=norm_type, activation_type=out_activation_type)
+
+        if self.learn_skip_connection:
+            self.res_conv = Conv2dBlock(num_channels, out_channels, kernel_size=3, padding=1, padding_mode=padding_mode,
+                                        norm_type=norm_type, activation_type=out_activation_type)
+
+    def forward(self, x):
+        res = x if not self.learn_skip_connection else self.res_conv(x)
+        return self.conv2(self.conv1(x)) + res
+
+
+class ReverseConv2dBlock(nn.Module):
+    def __init__(self, in_channels: int, out_channels: int,
+                 activation_type="ReLU", norm_type="NONE", additional_norm_kwargs=None, **conv_kwargs):
+        super().__init__()
+        self.normalization = _normalization(norm_type, in_channels, additional_norm_kwargs)
+        self.activation = _activation(activation_type)
+        self.convolution = nn.Conv2d(in_channels, out_channels, **conv_kwargs)
+
+    def forward(self, x):
+        return self.convolution(self.activation(self.normalization(x)))
+
+
+class ReverseResidualBlock(nn.Module):
+    def __init__(self, in_channels, out_channels, padding_mode="reflect",
+                 norm_type="IN", additional_norm_kwargs=None, activation_type="ReLU"):
+        super().__init__()
+        self.learn_skip_connection = in_channels != out_channels
+        self.conv1 = ReverseConv2dBlock(in_channels, in_channels, activation_type, norm_type, additional_norm_kwargs,
+                                        kernel_size=3, padding=1, padding_mode=padding_mode)
+        self.conv2 = ReverseConv2dBlock(in_channels, out_channels, activation_type, norm_type, additional_norm_kwargs,
+                                        kernel_size=3, padding=1, padding_mode=padding_mode)
+        if self.learn_skip_connection:
+            self.res_conv = ReverseConv2dBlock(
+                in_channels, out_channels, activation_type, norm_type, additional_norm_kwargs,
+                kernel_size=3, padding=1, padding_mode=padding_mode)
+
+    def forward(self, x):
+        res = x if not self.learn_skip_connection else self.res_conv(x)
+        return self.conv2(self.conv1(x)) + res
diff --git a/model/base/normalization.py b/model/base/normalization.py
new file mode 100644
index 0000000..7a925f4
--- /dev/null
+++ b/model/base/normalization.py
@@ -0,0 +1,142 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+from model import NORMALIZATION
+from model.base.module import Conv2dBlock
+
+_VALID_NORM_AND_ABBREVIATION = dict(
+    IN="InstanceNorm2d",
+    BN="BatchNorm2d",
+)
+
+for abbr, name in _VALID_NORM_AND_ABBREVIATION.items():
+    NORMALIZATION.register_module(module=getattr(nn, name), name=abbr)
+
+
+@NORMALIZATION.register_module("ADE")
+class AdaptiveDenormalization(nn.Module):
+    def __init__(self, num_features, base_norm_type="BN"):
+        super().__init__()
+        self.num_features = num_features
+        self.base_norm_type = base_norm_type
+        self.norm = self.base_norm(num_features)
+        self.gamma = None
+        self.beta = None
+        self.have_set_condition = False
+
+    def base_norm(self, num_features):
+        if self.base_norm_type == "IN":
+            return nn.InstanceNorm2d(num_features)
+        elif self.base_norm_type == "BN":
+            return nn.BatchNorm2d(num_features, affine=False, track_running_stats=True)
+
+    def set_condition(self, gamma, beta):
+        self.gamma, self.beta = gamma, beta
+        self.have_set_condition = True
+
+    def forward(self, x):
+        assert self.have_set_condition
+        x = self.norm(x)
+        x = self.gamma * x + self.beta
+        self.have_set_condition = False
+        return x
+
+    def __repr__(self):
+        return f"{self.__class__.__name__}(num_features={self.num_features}, " \
+               f"base_norm_type={self.base_norm_type})"
+
+
+@NORMALIZATION.register_module("AdaIN")
+class AdaptiveInstanceNorm2d(AdaptiveDenormalization):
+    def __init__(self, num_features: int):
+        super().__init__(num_features, "IN")
+        self.num_features = num_features
+
+    def set_style(self, style):
+        style = style.view(*style.size(), 1, 1)
+        gamma, beta = style.chunk(2, 1)
+        super().set_condition(gamma, beta)
+
+
+@NORMALIZATION.register_module("FADE")
+class FeatureAdaptiveDenormalization(AdaptiveDenormalization):
+    def __init__(self, num_features: int, condition_in_channels, base_norm_type="BN", padding_mode="zeros"):
+        super().__init__(num_features, base_norm_type)
+        self.beta_conv = nn.Conv2d(condition_in_channels, self.num_features, kernel_size=3, padding=1,
+                                   padding_mode=padding_mode)
+        self.gamma_conv = nn.Conv2d(condition_in_channels, self.num_features, kernel_size=3, padding=1,
+                                    padding_mode=padding_mode)
+
+    def set_feature(self, feature):
+        gamma = self.gamma_conv(feature)
+        beta = self.beta_conv(feature)
+        super().set_condition(gamma, beta)
+
+
+@NORMALIZATION.register_module("SPADE")
+class SpatiallyAdaptiveDenormalization(AdaptiveDenormalization):
+    def __init__(self, num_features: int, condition_in_channels, base_channels=128, base_norm_type="BN",
+                 activation_type="ReLU", padding_mode="zeros"):
+        super().__init__(num_features, base_norm_type)
+        self.base_conv_block = Conv2dBlock(condition_in_channels, num_features, activation_type=activation_type,
+                                           kernel_size=3, padding=1, padding_mode=padding_mode, norm_type="NONE")
+        self.beta_conv = nn.Conv2d(base_channels, num_features, kernel_size=3, padding=1, padding_mode=padding_mode)
+        self.gamma_conv = nn.Conv2d(base_channels, num_features, kernel_size=3, padding=1, padding_mode=padding_mode)
+
+    def set_condition_image(self, condition_image):
+        feature = self.base_conv_block(condition_image)
+        gamma = self.gamma_conv(feature)
+        beta = self.beta_conv(feature)
+        super().set_condition(gamma, beta)
+
+
+def _instance_layer_normalization(x, gamma, beta, rho, eps=1e-5):
+    out = rho * F.instance_norm(x, eps=eps) + (1 - rho) * F.layer_norm(x, x.size()[1:], eps=eps)
+    out = out * gamma + beta
+    return out
+
+
+@NORMALIZATION.register_module("ILN")
+class ILN(nn.Module):
+    def __init__(self, num_features, eps=1e-5):
+        super(ILN, self).__init__()
+        self.eps = eps
+        self.rho = nn.Parameter(torch.Tensor(num_features))
+        self.gamma = nn.Parameter(torch.Tensor(num_features))
+        self.beta = nn.Parameter(torch.Tensor(num_features))
+
+        self.reset_parameters()
+
+    def reset_parameters(self):
+        nn.init.zeros_(self.rho)
+        nn.init.ones_(self.gamma)
+        nn.init.zeros_(self.beta)
+
+    def forward(self, x):
+        return _instance_layer_normalization(
+            x, self.gamma.expand_as(x), self.beta.expand_as(x), self.rho.expand_as(x), self.eps)
+
+
+@NORMALIZATION.register_module("AdaILN")
+class AdaILN(nn.Module):
+    def __init__(self, num_features, eps=1e-5, default_rho=0.9):
+        super(AdaILN, self).__init__()
+        self.eps = eps
+        self.rho = nn.Parameter(torch.Tensor(num_features))
+        self.rho.data.fill_(default_rho)
+
+        self.gamma = None
+        self.beta = None
+        self.have_set_condition = False
+
+    def set_condition(self, gamma, beta):
+        self.gamma, self.beta = gamma, beta
+        self.have_set_condition = True
+
+    def forward(self, x):
+        assert self.have_set_condition
+        out = _instance_layer_normalization(
+            x, self.gamma.expand_as(x), self.beta.expand_as(x), self.rho.expand_as(x), self.eps)
+        self.have_set_condition = False
+        return out