diff --git a/torchglyph/optimizer.py b/torchglyph/optimizer.py
index 1dfcd20..95aa541 100644
--- a/torchglyph/optimizer.py
+++ b/torchglyph/optimizer.py
@@ -1,11 +1,13 @@
 from logging import getLogger
-from typing import Set, Tuple, Type
+from typing import Set, Tuple, Type, Union
 
 from torch import nn, optim
 
 logger = getLogger(__name__)
 
 IGNORES = (
+    nn.Embedding, nn.EmbeddingBag,
+
     nn.LayerNorm, nn.GroupNorm, nn.LocalResponseNorm,
 
     nn.SyncBatchNorm,
@@ -17,59 +19,76 @@
 )
 
 
-def group_parameters(*modules: nn.Module, ignores: Tuple[Type[nn.Module], ...] = IGNORES):
-    memory = set()
-    with_decay = set()
-    without_decay = set()
-
-    def recur(mod: nn.Module):
-        if mod in memory:
-            return
+def group_params(modules: Tuple[nn.Module, ...], ignores: Tuple[Type[nn.Module], ...] = IGNORES):
+    visited, require, without = set(), set(), set()
 
-        memory.add(mod)
+    def recur(module: nn.Module):
+        if module not in visited:
+            visited.add(module)
 
-        for name, param in mod.named_parameters(recurse=False):
-            if param.requires_grad:
-                if isinstance(mod, ignores) or 'bias' in name:
-                    without_decay.add(param)
-                else:
-                    with_decay.add(param)
+            for name, param in module.named_parameters(recurse=False):
+                if param.requires_grad:
+                    if isinstance(module, ignores) or 'bias' in name:
+                        without.add(param)
+                    else:
+                        require.add(param)
 
-        for m in mod._modules.values():
-            recur(mod=m)
+            for mod in module._modules.values():
+                recur(module=mod)
 
-    for module in modules:
-        recur(mod=module)
+    for m in modules:
+        recur(module=m)
 
-    return with_decay, without_decay
+    return require, without
 
 
-def log_parameters(module: nn.Module, with_decay: Set[nn.Parameter], without_decay: Set[nn.Parameter]):
-    for name, param in module.named_parameters():
-        if not param.requires_grad:
-            logger.critical(f'{name} {tuple(param.size())} requires no grad')
-        elif param in with_decay:
-            logger.info(f'{name} {tuple(param.size())} with decay')
-        elif param in without_decay:
-            logger.info(f'{name} {tuple(param.size())} without decay')
-        else:
-            logger.error(f'{name} {tuple(param.size())} is not registered')
+def log_params(*modules: nn.Module, require: Set[nn.Parameter], without: Set[nn.Parameter]):
+    for module in modules:
+        for name, param in module.named_parameters():
+            if not param.requires_grad:
+                logger.critical(f'{name} {tuple(param.size())} requires no grad')
+            elif param in require:
+                logger.info(f'{name} {tuple(param.size())} requires weight decay')
+            elif param in without:
+                logger.info(f'{name} {tuple(param.size())} requires no weight decay')
+            else:
+                logger.error(f'{name} {tuple(param.size())} is not registered')
 
 
 class SGD(optim.SGD):
     def __init__(self, lr: float = 1e-3, momentum: float = 0.9, dampening: float = 0.0,
-                 weight_decay: float = 1e-4, nesterov: bool = False, *, params, **kwargs) -> None:
+                 weight_decay: float = 1e-4, nesterov: bool = False, *,
+                 modules: Tuple[nn.Module, ...], **kwargs) -> None:
+        require, without = group_params(modules)
+        log_params(*modules, require=require, without=without)
+
         super(SGD, self).__init__(
-            params=params, lr=lr,
-            momentum=momentum, dampening=dampening,
-            weight_decay=weight_decay, nesterov=nesterov,
+            params=[
+                {'params': list(require), 'weight_decay': weight_decay},
+                {'params': list(without), 'weight_decay': 0},
+            ],
+            lr=lr, momentum=momentum,
+            dampening=dampening, nesterov=nesterov,
         )
 
 
 class Adam(optim.AdamW):
     def __init__(self, lr: float = 3e-4, beta1: float = 0.9, beta2: float = 0.98,
-                 weight_decay: float = 1e-4, amsgrad: bool = False, *, params, **kwargs) -> None:
+                 weight_decay: float = 1e-4, amsgrad: bool = False, *,
+                 modules: Tuple[nn.Module, ...], **kwargs) -> None:
+        require, without = group_params(modules)
+        log_params(*modules, require=require, without=without)
+
         super(Adam, self).__init__(
-            params=params, lr=lr, betas=(beta1, beta2),
-            weight_decay=weight_decay, amsgrad=amsgrad,
+            params=[
+                {'params': list(require), 'weight_decay': weight_decay},
+                {'params': list(without), 'weight_decay': 0},
+            ],
+            lr=lr, betas=(beta1, beta2), amsgrad=amsgrad,
         )
+
+
+Optimizer = Union[
+    Type[SGD],
+    Type[Adam],
+]