diff --git a/ppcls/arch/__init__.py b/ppcls/arch/__init__.py
index c2826d6b1194cf38e52042c3fcd8a3ac0e5b8f2e..f241952d2f928aed9cf41e778dbc74741b4357c8 100644
--- a/ppcls/arch/__init__.py
+++ b/ppcls/arch/__init__.py
@@ -18,11 +18,14 @@ import importlib
 import paddle.nn as nn
 
 from . import backbone
+from . import head
 
 from .backbone import *
-from ppcls.arch.loss_metrics.loss import *
+from .head  import *
 from .utils import *
 
+__all__ = ["build_model", "RecModel"]
+
 
 def build_model(config):
     config = copy.deepcopy(config)
@@ -35,31 +38,31 @@ def build_model(config):
 class RecModel(nn.Layer):
     def __init__(self, **config):
         super().__init__()
+
         backbone_config = config["Backbone"]
         backbone_name = backbone_config.pop("name")
-        self.backbone = getattr(backbone_name)(**backbone_config)
-        if "backbone_stop_layer" in config:
-            backbone_stop_layer = config["backbone_stop_layer"]
-            self.backbone.stop_layer(backbone_stop_layer)
+        self.backbone = eval(backbone_name)(**backbone_config)
 
-        if "Neck" in config:
-            neck_config = config["Neck"]
-            neck_name = neck_config.pop("name")
-            self.neck = getattr(neck_name)(**neck_config)
+        assert "Stoplayer" in config,  "Stoplayer should be specified in retrieval task \
+                please specified a Stoplayer config"
+        stop_layer_config = config["Stoplayer"]
+        self.backbone.stop_after(stop_layer_config["name"])
+        
+        if stop_layer_config.get("embedding_size", 0) > 0:
+            self.neck = nn.Linear(stop_layer_config["output_dim"], stop_layer_config["embedding_size"])
+            embedding_size = stop_layer_config["embedding_size"]
         else:
             self.neck = None
+            embedding_size = stop_layer_config["output_dim"]
+        
+        assert "Head" in config,  "Head should be specified in retrieval task \
+                please specify a Head config"
+        config["Head"]["embedding_size"] = embedding_size
+        self.head = build_head(config["Head"])
 
-        if "Head" in config:
-            head_config = config["Head"]
-            head_name = head_config.pop("name")
-            self.head = getattr(head_name)(**head_config)
-        else:
-            self.head = None
-
-    def forward(self, x):
-        y = self.backbone(x)
+    def forward(self, x, label):
+        x = self.backbone(x)
         if self.neck is not None:
-            y = self.neck(y)
-        if self.head is not None:
-            y = self.head(y)
-        return y
+            x = self.neck(x)
+        y = self.head(x, label)
+        return {"features":x, "logits":y}