diff --git a/docs/source/train.md b/docs/source/train.md
index dcbae3407..843955e81 100644
--- a/docs/source/train.md
+++ b/docs/source/train.md
@@ -194,9 +194,9 @@ pai -name easy_rec_ext -project algo_public
 ### 依赖
 
 - 混合并行使用Horovod做底层的通信, 因此需要安装Horovod, 可以直接使用下面的镜像
-- mybigpai-registry.cn-beijing.cr.aliyuncs.com/easyrec/easyrec:sok-tf212-gpus-v4
+- mybigpai-registry.cn-beijing.cr.aliyuncs.com/easyrec/easyrec:sok-tf212-gpus-v5
   ```
-    sudo docker run --gpus=all --privileged -v /home/easyrec/:/home/easyrec/ -ti mybigpai-registry.cn-beijing.cr.aliyuncs.com/easyrec/easyrec:sok-tf212-gpus-v4 bash
+    sudo docker run --gpus=all --privileged -v /home/easyrec/:/home/easyrec/ -ti mybigpai-registry.cn-beijing.cr.aliyuncs.com/easyrec/easyrec:sok-tf212-gpus-v5 bash
   ```
 
 ### 配置
diff --git a/easy_rec/python/compat/feature_column/feature_column.py b/easy_rec/python/compat/feature_column/feature_column.py
index 5428690ed..73a568d9c 100644
--- a/easy_rec/python/compat/feature_column/feature_column.py
+++ b/easy_rec/python/compat/feature_column/feature_column.py
@@ -171,6 +171,7 @@
 from tensorflow.python.util import nest
 
 from easy_rec.python.compat.feature_column import utils as fc_utils
+from easy_rec.python.utils import conditional
 from easy_rec.python.utils import constant
 from easy_rec.python.utils import embedding_utils
 
@@ -248,8 +249,13 @@ def embedding_parallel_lookup(embedding,
                               lookup_indices,
                               output_ids,
                               is_training,
-                              output_tensors=None):
+                              output_tensors=None,
+                              batch_size=None):
   N = len(output_ids)
+  if batch_size is None:
+    num_segments = None
+  else:
+    num_segments = N * batch_size
   # first concat all the ids and unique
   if isinstance(lookup_indices, dict) and 'sparse_fea' in lookup_indices.keys():
     # all_uniq_ids, uniq_idx, segment_lens = features['sparse_fea']
@@ -318,7 +324,11 @@ def embedding_parallel_lookup(embedding,
     recv_embeddings = data_flow_ops.parallel_dynamic_stitch(
         original_part_ids, recv_embeddings, name='parallel_dynamic_stitch')
     embeddings = math_ops.sparse_segment_sum(
-        recv_embeddings, uniq_idx, segment_ids, name='sparse_segment_sum')
+        recv_embeddings,
+        uniq_idx,
+        segment_ids,
+        num_segments=num_segments,
+        name='sparse_segment_sum')
   else:
     if isinstance(embedding, dynamic_variable.DynamicVariable):
       recv_embeddings = embedding.sparse_read(
@@ -326,7 +336,11 @@ def embedding_parallel_lookup(embedding,
     else:
       recv_embeddings = array_ops.gather(embedding, all_uniq_ids)
     embeddings = math_ops.sparse_segment_sum(
-        recv_embeddings, uniq_idx, segment_ids, name='sparse_segment_sum')
+        recv_embeddings,
+        uniq_idx,
+        segment_ids,
+        num_segments=num_segments,
+        name='sparse_segment_sum')
 
   embed_dim = embedding.get_shape()[-1]
   output_tensor = array_ops.reshape(embeddings, [N, -1, embed_dim])
@@ -336,8 +350,11 @@ def embedding_parallel_lookup(embedding,
     for output, output_id in zip(outputs, output_ids):
       output_tensors[output_id] = array_ops.squeeze(output, axis=0)
 
+  if batch_size is None:
+    batch_size = -1
   return array_ops.reshape(
-      array_ops.transpose(output_tensor, perm=[1, 0, 2]), [-1, N * embed_dim])
+      array_ops.transpose(output_tensor, perm=[1, 0, 2]),
+      [batch_size, N * embed_dim])
 
 
 def _internal_input_layer(features,
@@ -399,6 +416,18 @@ def _get_logits():  # pylint: disable=missing-docstring
   def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
     assert hvd is not None, 'horovod is not installed'
     builder = _LazyBuilder(features)
+
+    if embedding_utils.embedding_on_cpu():
+      embedding_device = '/cpu:0'
+    else:
+      embedding_device = '/gpu:0'
+
+    def _get_var_type(column):
+      if column.ev_params.use_cache:
+        return 'hybrid'
+      else:
+        return None
+
     output_tensors = []
     ordered_columns = []
 
@@ -414,6 +443,8 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
 
     shared_weights = {}
     dense_cnt = 0
+
+    batch_sizes = []
     for column in feature_columns:
       ordered_columns.append(column)
       with variable_scope.variable_scope(
@@ -435,15 +466,14 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
           if shared_name in shared_weights:
             embedding_weights = shared_weights[shared_name]
           else:
-            with ops.device('/gpu:0'):
+            with ops.device(embedding_device):
               if column.ev_params is not None:
                 assert dynamic_variable is not None, 'sok is not installed'
                 embedding_weights = dynamic_variable.DynamicVariable(
                     name='embedding_weights',
                     dimension=column.dimension,
                     initializer='random {"stddev":0.0025}',  # column.initializer,
-                    var_type=None
-                    if not column.ev_params.use_cache else 'hybrid',
+                    var_type=_get_var_type(column),
                     trainable=column.trainable and trainable,
                     dtype=dtypes.float32,
                     init_capacity=column.ev_params.init_capacity,
@@ -459,14 +489,14 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
                     collections=weight_collections)
             shared_weights[shared_name] = embedding_weights
         else:
-          with ops.device('/gpu:0'):
+          with ops.device(embedding_device):
             if column.ev_params is not None:
               assert dynamic_variable is not None, 'sok is not installed'
               embedding_weights = dynamic_variable.DynamicVariable(
                   name='embedding_weights',
                   dimension=column.dimension,
                   initializer='random {"stddev":0.0025}',  # column.initializer,
-                  var_type=None if not column.ev_params.use_cache else 'hybrid',
+                  var_type=_get_var_type(column),
                   trainable=column.trainable and trainable,
                   dtype=dtypes.float32,
                   init_capacity=column.ev_params.init_capacity,
@@ -525,13 +555,19 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
           output_tensors[dense_output_id] = features[
               'dense_fea'][:, fea_dim_s:fea_dim_e]
           fea_dim_s = fea_dim_e
+        batch_sizes.append(array_ops.shape(features['dense_fea'])[0])
       else:
         for dense_output_id, dense_col in zip(dense_output_ids, dense_cols):
           output_tensors[dense_output_id] = features[dense_col.raw_name]
+        batch_sizes.append(array_ops.shape(output_tensors[dense_output_id])[0])
 
     for tmp_embed_var in set(lookup_embeddings):
       ops.add_to_collection(constant.EmbeddingParallel, tmp_embed_var.name)
 
+    if len(batch_sizes) == 0:
+      batch_size = None
+    else:
+      batch_size = batch_sizes[0]
     # do embedding parallel lookup
     if len(lookup_output_ids) > 0:
       packed_input = ('sparse_fea' in features or 'ragged_ids' in features)
@@ -540,8 +576,15 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
         assert uniq_embed_cnt == 1, 'only one uniq embed is support for packed inputs'
         outputs = embedding_parallel_lookup(lookup_embeddings[0],
                                             lookup_indices, lookup_output_ids,
-                                            is_training, output_tensors)
+                                            is_training, output_tensors,
+                                            batch_size)
       else:
+        if batch_size is None:
+          all_indices = []
+          for lookup_indice in lookup_indices:
+            all_indices.append(lookup_indice.indices[-1:, 0])
+          all_indices = array_ops.concat(all_indices, axis=0)
+          batch_size = math_ops.reduce_max(all_indices) + 1
         # group lookup_embeddings
         grouped_inputs = {}
         for embedding, lookup_indice, output_id in zip(lookup_embeddings,
@@ -561,7 +604,7 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
           output_ids = grouped_inputs[embedding]['output_id']
           outputs = embedding_parallel_lookup(embedding, lookup_indices,
                                               output_ids, is_training,
-                                              output_tensors)
+                                              output_tensors, batch_size)
 
       for output_tensor, col in zip(output_tensors, feature_columns):
         if feature_name_to_output_tensors is not None:
@@ -592,7 +635,8 @@ def _get_logits_embedding_parallel():  # pylint: disable=missing-docstring
       if embedding_utils.is_embedding_parallel():
         return _get_logits_embedding_parallel()
       else:
-        with ops.device('/CPU:0'):
+        with conditional(embedding_utils.embedding_on_cpu(),
+                         ops.device('/cpu:0')):
           return _get_logits()
 
 
diff --git a/easy_rec/python/compat/sok_optimizer.py b/easy_rec/python/compat/sok_optimizer.py
index 429c25963..7f368a9a1 100644
--- a/easy_rec/python/compat/sok_optimizer.py
+++ b/easy_rec/python/compat/sok_optimizer.py
@@ -135,22 +135,23 @@ def _create_slots_dynamic(self, var):
     for slot_name in self._initial_vals:
       if key not in self._optimizer._slots[slot_name]:
         if var.backend_type == 'hbm':
-          slot = DynamicVariable(
-              dimension=var.dimension,
-              initializer=self._initial_vals[slot_name],
-              name='DynamicSlot',
-              trainable=False,
-          )
+          with ops.colocate_with(var):
+            slot = DynamicVariable(
+                dimension=var.dimension,
+                initializer=self._initial_vals[slot_name],
+                name='DynamicSlot',
+                trainable=False)
         else:
           tmp_config = var.config_dict
           # tmp_initializer = var.initializer_str
-          slot = DynamicVariable(
-              dimension=var.dimension,
-              initializer=self._initial_vals[slot_name],
-              var_type=var.backend_type,
-              name='DynamicSlot',
-              trainable=False,
-              **tmp_config)
+          with ops.colocate_with(var):
+            slot = DynamicVariable(
+                dimension=var.dimension,
+                initializer=self._initial_vals[slot_name],
+                var_type=var.backend_type,
+                name='DynamicSlot',
+                trainable=False,
+                **tmp_config)
 
         self._optimizer._slots[slot_name][key] = slot
 
@@ -228,22 +229,24 @@ def apply_sparse_gradients(self, grads_and_vars, global_step=None, name=None):
           if key not in self._optimizer._slots[slot_name]:
             tmp_slot_var_name = v._dummy_handle.op.name + '/' + self._optimizer._name
             if v.backend_type == 'hbm':
-              slot = DynamicVariable(
-                  dimension=v.dimension,
-                  initializer=self._initial_vals[slot_name],
-                  name=tmp_slot_var_name,
-                  trainable=False,
-              )
+              with ops.colocate_with(v):
+                slot = DynamicVariable(
+                    dimension=v.dimension,
+                    initializer=self._initial_vals[slot_name],
+                    name=tmp_slot_var_name,
+                    trainable=False,
+                )
             else:
               tmp_config = v.config_dict
               # tmp_initializer = v.initializer_str
-              slot = DynamicVariable(
-                  dimension=v.dimension,
-                  initializer=self._initial_vals[slot_name],
-                  var_type=v.backend_type,
-                  name=tmp_slot_var_name,
-                  trainable=False,
-                  **tmp_config)
+              with ops.colocate_with(v):
+                slot = DynamicVariable(
+                    dimension=v.dimension,
+                    initializer=self._initial_vals[slot_name],
+                    var_type=v.backend_type,
+                    name=tmp_slot_var_name,
+                    trainable=False,
+                    **tmp_config)
 
             self._optimizer._slots[slot_name][key] = slot
           else:
diff --git a/easy_rec/python/input/input.py b/easy_rec/python/input/input.py
index 5e3de03a2..d94b1de13 100644
--- a/easy_rec/python/input/input.py
+++ b/easy_rec/python/input/input.py
@@ -461,7 +461,7 @@ def _parse_tag_feature(self, fc, parsed_dict, field_dict):
             indices, tmp_ks, parsed_dict[feature_name].dense_shape)
         parsed_dict[feature_name + '_w'] = tf.sparse.SparseTensor(
             indices, tmp_vs, parsed_dict[feature_name].dense_shape)
-      if not fc.HasField('hash_bucket_size'):
+      if not fc.HasField('hash_bucket_size') and fc.num_buckets > 0:
         check_list = [
             tf.py_func(
                 check_string_to_number,
@@ -1039,7 +1039,7 @@ def _input_fn(mode=None, params=None, config=None):
         dataset = self._build(mode, params)
         return dataset
       elif mode is None:  # serving_input_receiver_fn for export SavedModel
-        place_on_cpu = os.getenv('place_embedding_on_cpu')
+        place_on_cpu = os.getenv(constant.EmbeddingOnCPU)
         place_on_cpu = eval(place_on_cpu) if place_on_cpu else False
         if export_config.multi_placeholder:
           with conditional(place_on_cpu, ops.device('/CPU:0')):
diff --git a/easy_rec/python/model/easy_rec_estimator.py b/easy_rec/python/model/easy_rec_estimator.py
index be22ec928..c40260b18 100644
--- a/easy_rec/python/model/easy_rec_estimator.py
+++ b/easy_rec/python/model/easy_rec_estimator.py
@@ -657,6 +657,8 @@ def _export_model_fn(self, features, labels, run_config, params):
   def _model_fn(self, features, labels, mode, config, params):
     os.environ['tf.estimator.mode'] = mode
     os.environ['tf.estimator.ModeKeys.TRAIN'] = tf.estimator.ModeKeys.TRAIN
+    if self._pipeline_config.feature_config.embedding_on_cpu:
+      os.environ['place_embedding_on_cpu'] = 'True'
     if self._pipeline_config.fg_json_path:
       EasyRecEstimator._write_rtp_fg_config_to_col(
           fg_config_path=self._pipeline_config.fg_json_path)
diff --git a/easy_rec/python/protos/easy_rec_model.proto b/easy_rec/python/protos/easy_rec_model.proto
index 1cbd55440..b0f79fe0f 100644
--- a/easy_rec/python/protos/easy_rec_model.proto
+++ b/easy_rec/python/protos/easy_rec_model.proto
@@ -27,7 +27,6 @@ import "easy_rec/python/protos/variational_dropout.proto";
 import "easy_rec/python/protos/multi_tower_recall.proto";
 import "easy_rec/python/protos/tower.proto";
 import "easy_rec/python/protos/pdn.proto";
-// import "easy_rec/python/protos/ppnet.proto";
 
 // for input performance test
 message DummyModel {
@@ -92,8 +91,6 @@ message EasyRecModel {
         SimpleMultiTask simple_multi_task = 304;
         PLE ple = 305;
 
-        // PPNetV3 ppnet = 306;
-
         RocketLaunching rocket_launching = 401;
     }
     repeated SeqAttGroupConfig seq_att_groups = 7;
diff --git a/easy_rec/python/protos/feature_config.proto b/easy_rec/python/protos/feature_config.proto
index fb5375822..3dba84072 100644
--- a/easy_rec/python/protos/feature_config.proto
+++ b/easy_rec/python/protos/feature_config.proto
@@ -145,6 +145,9 @@ message FeatureConfig {
 
 message FeatureConfigV2 {
     repeated FeatureConfig features = 1 ;
+    // force place embedding lookup ops on cpu to improve
+    // training and inference efficiency.
+    optional bool embedding_on_cpu = 2 [default=false];
 }
 
 message FeatureGroupConfig {
diff --git a/easy_rec/python/utils/constant.py b/easy_rec/python/utils/constant.py
index 7b7818681..50d071b83 100644
--- a/easy_rec/python/utils/constant.py
+++ b/easy_rec/python/utils/constant.py
@@ -23,6 +23,9 @@
 # shard embedding var_name collection
 EmbeddingParallel = 'EmbeddingParallel'
 
+# environ variable to force embedding placement on cpu
+EmbeddingOnCPU = 'place_embedding_on_cpu'
+
 
 def enable_avx_str_split():
   os.environ[ENABLE_AVX_STR_SPLIT] = '1'
diff --git a/easy_rec/python/utils/embedding_utils.py b/easy_rec/python/utils/embedding_utils.py
index 5d171b4e4..960513801 100644
--- a/easy_rec/python/utils/embedding_utils.py
+++ b/easy_rec/python/utils/embedding_utils.py
@@ -65,3 +65,9 @@ def is_embedding_parallel():
 
 def sort_col_by_name():
   return constant.SORT_COL_BY_NAME in os.environ
+
+
+def embedding_on_cpu():
+  place_on_cpu = os.getenv(constant.EmbeddingOnCPU)
+  place_on_cpu = eval(place_on_cpu) if place_on_cpu else False
+  return place_on_cpu
diff --git a/samples/model_config/multi_tower_on_taobao_sok.config b/samples/model_config/multi_tower_on_taobao_sok.config
index ccf840b44..7dfe7c987 100644
--- a/samples/model_config/multi_tower_on_taobao_sok.config
+++ b/samples/model_config/multi_tower_on_taobao_sok.config
@@ -1,5 +1,5 @@
-train_input_path: "taobao_train_data_8192"
-# train_input_path: "data/test/tb_data/taobao_train_data"
+# train_input_path: "taobao_train_data_8192"
+train_input_path: "data/test/tb_data/taobao_train_data"
 eval_input_path: "data/test/tb_data/taobao_test_data"
 model_dir: "experiments/multi_tower_taobao_ckpt"
 
@@ -136,8 +136,7 @@ data_config {
   batch_size: 8192
   num_epochs: 1000000
   prefetch_size: 64
-  # input_type: CSVInput
-  input_type: DummyInput
+  input_type: CSVInput
 }
 
 feature_config: {