1 files changed, 15 insertions, 4 deletions
diff --git a/text_recognizer/networks/transformer/layers.py b/text_recognizer/networks/transformer/layers.py
index 67558ad..fc32f20 100644
--- a/text_recognizer/networks/transformer/layers.py
+++ b/text_recognizer/networks/transformer/layers.py
@@ -15,7 +15,6 @@ class AttentionLayers(nn.Module):
     """Standard transfomer layer."""
 
     def __attrs_pre_init__(self) -> None:
-        """Pre init constructor."""
         super().__init__()
 
     depth: int = attr.ib()
@@ -29,9 +28,8 @@ class AttentionLayers(nn.Module):
     layers: nn.ModuleList = attr.ib(init=False)
 
     def __attrs_post_init__(self) -> None:
-        """Post init configuration."""
         self.layer_types = self._get_layer_types() * self.depth
-        self.layers = self._build_network()
+        self.layers = self._build()
 
     def _get_layer_types(self) -> Tuple:
         """Get layer specification."""
@@ -45,7 +43,7 @@ class AttentionLayers(nn.Module):
         del self.norm
         del self.cross_attn
 
-    def _build_network(self) -> nn.ModuleList:
+    def _build(self) -> nn.ModuleList:
         """Configures transformer network."""
         layers = nn.ModuleList([])
         for layer_type in self.layer_types:
@@ -97,4 +95,17 @@ class Decoder(AttentionLayers):
     """Decoder module."""
 
     def __init__(self, **kwargs: Any) -> None:
+        if "cross_attn" not in kwargs:
+            ValueError("Decoder requires cross attention.")
+
+        super().__init__(**kwargs)
+
+
+class Encoder(AttentionLayers):
+    """Encoder module."""
+
+    def __init__(self, **kwargs: Any) -> None:
+        if "cross_attn" in kwargs:
+            ValueError("Encoder requires cross attention.")
+
         super().__init__(**kwargs)