diff --git a/core/trainers/framework/network.py b/core/trainers/framework/network.py
index 71f2a4e7fa6ef671c3a07724183edf2e759aec5e..74d2c97540419b15e6a5d0f87b3c5af368a7e9b3 100644
--- a/core/trainers/framework/network.py
+++ b/core/trainers/framework/network.py
@@ -94,6 +94,7 @@ class SingleNetwork(NetworkBase):
             context["model"][model_dict["name"]]["model"] = model
             context["model"][model_dict["name"]][
                 "default_main_program"] = train_program.clone()
+            context["model"][model_dict["name"]]["compiled_program"] = None
 
         context["dataset"] = {}
         for dataset in context["env"]["dataset"]:
@@ -149,6 +150,7 @@ class PSNetwork(NetworkBase):
         context["model"][model_dict["name"]]["model"] = model
         context["model"][model_dict["name"]]["default_main_program"] = context[
             "fleet"].main_program.clone()
+        context["model"][model_dict["name"]]["compiled_program"] = None
 
         if context["fleet"].is_server():
             self._server(context)
@@ -245,6 +247,8 @@ class PslibNetwork(NetworkBase):
                     context["model"][model_dict["name"]]["model"] = model
                     context["model"][model_dict["name"]][
                         "default_main_program"] = train_program.clone()
+                    context["model"][model_dict["name"]][
+                        "compile_program"] = None
 
         if context["fleet"].is_server():
             self._server(context)
@@ -314,6 +318,7 @@ class CollectiveNetwork(NetworkBase):
                 context["model"][model_dict["name"]]["model"] = model
                 context["model"][model_dict["name"]][
                     "default_main_program"] = train_program
+                context["model"][model_dict["name"]]["compiled_program"] = None
 
         context["dataset"] = {}
         for dataset in context["env"]["dataset"]:
diff --git a/core/trainers/framework/runner.py b/core/trainers/framework/runner.py
index 46a7a1c49ef2e993b9974263efd07b5e81dbae00..fb2c87a93e51424934ff5fbb0b9b18142082f348 100644
--- a/core/trainers/framework/runner.py
+++ b/core/trainers/framework/runner.py
@@ -50,6 +50,7 @@ class RunnerBase(object):
         reader_name = model_dict["dataset_name"]
         model_name = model_dict["name"]
         model_class = context["model"][model_dict["name"]]["model"]
+
         fetch_vars = []
         fetch_alias = []
         fetch_period = int(
@@ -89,19 +90,7 @@ class RunnerBase(object):
     def _executor_dataloader_train(self, model_dict, context):
         model_name = model_dict["name"]
         model_class = context["model"][model_dict["name"]]["model"]
-
-        if context["is_infer"]:
-            program = context["model"][model_name]["main_program"]
-        elif context["is_fleet"]:
-            if context["fleet_mode"].upper() == "PS":
-                program = self._get_ps_program(model_dict, context)
-            elif context["fleet_mode"].upper() == "COLLECTIVE":
-                program = context["model"][model_name]["main_program"]
-        elif not context["is_fleet"]:
-            if context["device"].upper() == "CPU":
-                program = self._get_single_cpu_program(model_dict, context)
-            elif context["device"].upper() == "GPU":
-                program = self._get_single_gpu_program(model_dict, context)
+        program = self._get_dataloader_program(model_dict, context)
 
         reader_name = model_dict["dataset_name"]
         fetch_vars = []
@@ -143,6 +132,24 @@ class RunnerBase(object):
             except fluid.core.EOFException:
                 reader.reset()
 
+    def _get_dataloader_program(self, model_dict, context):
+        model_name = model_dict["name"]
+        if context["model"][model_name]["compiled_program"] == None:
+            if context["is_infer"]:
+                program = context["model"][model_name]["main_program"]
+            elif context["is_fleet"]:
+                if context["fleet_mode"].upper() == "PS":
+                    program = self._get_ps_program(model_dict, context)
+                elif context["fleet_mode"].upper() == "COLLECTIVE":
+                    program = context["model"][model_name]["main_program"]
+            elif not context["is_fleet"]:
+                if context["device"].upper() == "CPU":
+                    program = self._get_single_cpu_program(model_dict, context)
+                elif context["device"].upper() == "GPU":
+                    program = self._get_single_gpu_program(model_dict, context)
+            context["model"][model_name]["compiled_program"] = program
+        return context["model"][model_name]["compiled_program"]
+
     def _get_strategy(self, model_dict, context):
         _build_strategy = fluid.BuildStrategy()
         _exe_strategy = fluid.ExecutionStrategy()
@@ -218,12 +225,17 @@ class RunnerBase(object):
 
     def save(self, epoch_id, context, is_fleet=False):
         def need_save(epoch_id, epoch_interval, is_last=False):
+            name = "runner." + context["runner_name"] + "."
+            total_epoch = int(envs.get_global_env(name + "epochs", 1))
+            if epoch_id + 1 == total_epoch:
+                is_last = True
+
             if is_last:
                 return True
             if epoch_id == -1:
                 return False
 
-            return epoch_id % epoch_interval == 0
+            return (epoch_id + 1) % epoch_interval == 0
 
         def save_inference_model():
             name = "runner." + context["runner_name"] + "."
@@ -415,3 +427,53 @@ class PslibRunner(RunnerBase):
 
         """
         context["status"] = "terminal_pass"
+
+
+class SingleInferRunner(RunnerBase):
+    def __init__(self, context):
+        print("Running SingleInferRunner.")
+        pass
+
+    def run(self, context):
+        self._dir_check(context)
+
+        for index, epoch_name in enumerate(self.epoch_model_name_list):
+            for model_dict in context["phases"]:
+                self._load(context, model_dict,
+                           self.epoch_model_path_list[index])
+                begin_time = time.time()
+                self._run(context, model_dict)
+                end_time = time.time()
+                seconds = end_time - begin_time
+                print("Infer {} of {} done, use time: {}".format(model_dict[
+                    "name"], epoch_name, seconds))
+        context["status"] = "terminal_pass"
+
+    def _load(self, context, model_dict, model_path):
+        if model_path is None or model_path == "":
+            return
+        print("load persistables from", model_path)
+
+        with fluid.scope_guard(context["model"][model_dict["name"]]["scope"]):
+            train_prog = context["model"][model_dict["name"]]["main_program"]
+            startup_prog = context["model"][model_dict["name"]][
+                "startup_program"]
+            with fluid.program_guard(train_prog, startup_prog):
+                fluid.io.load_persistables(
+                    context["exe"], model_path, main_program=train_prog)
+
+    def _dir_check(self, context):
+        dirname = envs.get_global_env(
+            "runner." + context["runner_name"] + ".init_model_path", None)
+        self.epoch_model_path_list = []
+        self.epoch_model_name_list = []
+
+        for file in os.listdir(dirname):
+            file_path = os.path.join(dirname, file)
+            if os.path.isdir(file_path):
+                self.epoch_model_path_list.append(file_path)
+                self.epoch_model_name_list.append(file)
+
+        if len(self.epoch_model_path_list) == 0:
+            self.epoch_model_path_list.append(dirname)
+            self.epoch_model_name_list.append(dirname)
diff --git a/core/trainers/framework/startup.py b/core/trainers/framework/startup.py
index 82e244723ecae607eb8cfc1110c0a29642bd4615..2687dcdd0f3ce5ac39a17ec4cdf8fb4cfe031513 100644
--- a/core/trainers/framework/startup.py
+++ b/core/trainers/framework/startup.py
@@ -101,3 +101,21 @@ class CollectiveStartup(StartupBase):
                 context["exe"].run(startup_prog)
                 self.load(context, True)
         context["status"] = "train_pass"
+
+
+class SingleInferStartup(StartupBase):
+    def __init__(self, context):
+        print("Running SingleInferStartup.")
+        pass
+
+    def startup(self, context):
+        for model_dict in context["phases"]:
+            with fluid.scope_guard(context["model"][model_dict["name"]][
+                    "scope"]):
+                train_prog = context["model"][model_dict["name"]][
+                    "main_program"]
+                startup_prog = context["model"][model_dict["name"]][
+                    "startup_program"]
+                with fluid.program_guard(train_prog, startup_prog):
+                    context["exe"].run(startup_prog)
+        context["status"] = "train_pass"
diff --git a/core/trainers/general_trainer.py b/core/trainers/general_trainer.py
index ded99e1caa903db2eea2c16fa8f811764991f16a..4936cc8ba09e2cb91053dd94915981f4adec93a6 100644
--- a/core/trainers/general_trainer.py
+++ b/core/trainers/general_trainer.py
@@ -101,7 +101,9 @@ class GeneralTrainer(Trainer):
             startup_class = envs.lazy_instance_by_fliename(startup_class_path,
                                                            "Startup")(context)
         else:
-            if self.engine == EngineMode.SINGLE:
+            if self.engine == EngineMode.SINGLE and context["is_infer"]:
+                startup_class_name = "SingleInferStartup"
+            elif self.engine == EngineMode.SINGLE and not context["is_infer"]:
                 startup_class_name = "SingleStartup"
             elif self.fleet_mode == FleetMode.PS or self.fleet_mode == FleetMode.PSLIB:
                 startup_class_name = "PSStartup"
@@ -117,12 +119,14 @@ class GeneralTrainer(Trainer):
 
     def runner(self, context):
         runner_class_path = envs.get_global_env(
-            self.runner_env_name + ".runner_class_paht", default_value=None)
+            self.runner_env_name + ".runner_class_path", default_value=None)
         if runner_class_path:
             runner_class = envs.lazy_instance_by_fliename(runner_class_path,
                                                           "Runner")(context)
         else:
-            if self.engine == EngineMode.SINGLE:
+            if self.engine == EngineMode.SINGLE and context["is_infer"]:
+                runner_class_name = "SingleInferRunner"
+            elif self.engine == EngineMode.SINGLE and not context["is_infer"]:
                 runner_class_name = "SingleRunner"
             elif self.fleet_mode == FleetMode.PSLIB:
                 runner_class_name = "PslibRunner"
diff --git a/core/utils/validation.py b/core/utils/validation.py
index a2911cb36899430ec3a0f3b5a5c842a01470ccd9..7448daf8c763d9d6311356e369ddf4855d7eac97 100755
--- a/core/utils/validation.py
+++ b/core/utils/validation.py
@@ -16,16 +16,25 @@ from paddlerec.core.utils import envs
 
 
 class ValueFormat:
-    def __init__(self, value_type, value, value_handler):
+    def __init__(self, value_type, value, value_handler, required=False):
         self.value_type = value_type
-        self.value = value
         self.value_handler = value_handler
+        self.value = value
+        self.required = required
 
     def is_valid(self, name, value):
-        ret = self.is_type_valid(name, value)
+
+        if not self.value_type:
+            ret = True
+        else:
+            ret = self.is_type_valid(name, value)
+
         if not ret:
             return ret
 
+        if not self.value or not self.value_handler:
+            return True
+
         ret = self.is_value_valid(name, value)
         return ret
 
@@ -33,21 +42,21 @@ class ValueFormat:
         if self.value_type == "int":
             if not isinstance(value, int):
                 print("\nattr {} should be int, but {} now\n".format(
-                    name, self.value_type))
+                    name, type(value)))
                 return False
             return True
 
         elif self.value_type == "str":
             if not isinstance(value, str):
                 print("\nattr {} should be str, but {} now\n".format(
-                    name, self.value_type))
+                    name, type(value)))
                 return False
             return True
 
         elif self.value_type == "strs":
             if not isinstance(value, list):
                 print("\nattr {} should be list(str), but {} now\n".format(
-                    name, self.value_type))
+                    name, type(value)))
                 return False
             for v in value:
                 if not isinstance(v, str):
@@ -56,10 +65,29 @@ class ValueFormat:
                     return False
             return True
 
+        elif self.value_type == "dict":
+            if not isinstance(value, dict):
+                print("\nattr {} should be str, but {} now\n".format(
+                    name, type(value)))
+                return False
+            return True
+
+        elif self.value_type == "dicts":
+            if not isinstance(value, list):
+                print("\nattr {} should be list(dist), but {} now\n".format(
+                    name, type(value)))
+                return False
+            for v in value:
+                if not isinstance(v, dict):
+                    print("\nattr {} should be list(dist), but list({}) now\n".
+                          format(name, type(v)))
+                    return False
+            return True
+
         elif self.value_type == "ints":
             if not isinstance(value, list):
                 print("\nattr {} should be list(int), but {} now\n".format(
-                    name, self.value_type))
+                    name, type(value)))
                 return False
             for v in value:
                 if not isinstance(v, int):
@@ -74,7 +102,7 @@ class ValueFormat:
             return False
 
     def is_value_valid(self, name, value):
-        ret = self.value_handler(value)
+        ret = self.value_handler(name, value, self.value)
         return ret
 
 
@@ -112,38 +140,35 @@ def le_value_handler(name, value, values):
 
 def register():
     validations = {}
-    validations["train.workspace"] = ValueFormat("str", None, eq_value_handler)
-    validations["train.device"] = ValueFormat("str", ["cpu", "gpu"],
-                                              in_value_handler)
-    validations["train.epochs"] = ValueFormat("int", 1, ge_value_handler)
-    validations["train.engine"] = ValueFormat(
-        "str", ["train", "infer", "local_cluster_train", "cluster_train"],
-        in_value_handler)
-
-    requires = ["workspace", "dataset", "mode", "runner", "phase"]
-    return validations, requires
+    validations["workspace"] = ValueFormat("str", None, None, True)
+    validations["mode"] = ValueFormat(None, None, None, True)
+    validations["runner"] = ValueFormat("dicts", None, None, True)
+    validations["phase"] = ValueFormat("dicts", None, None, True)
+    validations["hyper_parameters"] = ValueFormat("dict", None, None, False)
+    return validations
 
 
 def yaml_validation(config):
-    all_checkers, require_checkers = register()
+    all_checkers = register()
+
+    require_checkers = []
+    for name, checker in all_checkers.items():
+        if checker.required:
+            require_checkers.append(name)
 
     _config = envs.load_yaml(config)
-    flattens = envs.flatten_environs(_config)
 
     for required in require_checkers:
-        if required not in flattens.keys():
+        if required not in _config.keys():
             print("\ncan not find {} in yaml, which is required\n".format(
                 required))
             return False
 
-    for name, flatten in flattens.items():
+    for name, value in _config.items():
         checker = all_checkers.get(name, None)
-
-        if not checker:
-            continue
-
-        ret = checker.is_valid(name, flattens)
-        if not ret:
-            return False
+        if checker:
+            ret = checker.is_valid(name, value)
+            if not ret:
+                return False
 
     return True
diff --git a/models/match/dssm/synthetic_evaluate_reader.py b/models/match/dssm/synthetic_evaluate_reader.py
index 29c14ce5542467b4f5eec5b136c3fff29f211d95..3d8413cdf0093e2bad1b50c8c9710b421f4c2660 100755
--- a/models/match/dssm/synthetic_evaluate_reader.py
+++ b/models/match/dssm/synthetic_evaluate_reader.py
@@ -30,8 +30,8 @@ class Reader(ReaderBase):
             This function needs to be implemented by the user, based on data format
             """
             features = line.rstrip('\n').split('\t')
-            query = map(float, features[0].split(','))
-            pos_doc = map(float, features[1].split(','))
+            query = [float(feature) for feature in features[0].split(',')]
+            pos_doc = [float(feature) for feature in features[1].split(',')]
             feature_names = ['query', 'doc_pos']
 
             yield zip(feature_names, [query] + [pos_doc])
diff --git a/models/match/dssm/synthetic_reader.py b/models/match/dssm/synthetic_reader.py
index d5641dc1adb007a4f370f0d0832305d30fcb8d5b..e358e04cd9e8a45ee6a8129bf747f1e5afef862f 100755
--- a/models/match/dssm/synthetic_reader.py
+++ b/models/match/dssm/synthetic_reader.py
@@ -31,13 +31,15 @@ class Reader(ReaderBase):
             This function needs to be implemented by the user, based on data format
             """
             features = line.rstrip('\n').split('\t')
-            query = map(float, features[0].split(','))
-            pos_doc = map(float, features[1].split(','))
+            query = [float(feature) for feature in features[0].split(',')]
+            pos_doc = [float(feature) for feature in features[1].split(',')]
             feature_names = ['query', 'doc_pos']
             neg_docs = []
             for i in range(len(features) - 2):
                 feature_names.append('doc_neg_' + str(i))
-                neg_docs.append(map(float, features[i + 2].split(',')))
+                neg_docs.append([
+                    float(feature) for feature in features[i + 2].split(',')
+                ])
 
             yield zip(feature_names, [query] + [pos_doc] + neg_docs)
 
diff --git a/models/rank/afm/model.py b/models/rank/afm/model.py
index c4bb0ef9fb3c7ed4422dbe8b29fa005db95f91c0..2ca2d5db470bb77eebc33363353141038f69b221 100644
--- a/models/rank/afm/model.py
+++ b/models/rank/afm/model.py
@@ -133,7 +133,7 @@ class Model(ModelBase):
             attention_h)  # (batch_size * (num_field*(num_field-1)/2)) * 1
         attention_out = fluid.layers.softmax(
             attention_out)  # (batch_size * (num_field*(num_field-1)/2)) * 1
-        num_interactions = self.num_field * (self.num_field - 1) / 2
+        num_interactions = int(self.num_field * (self.num_field - 1) / 2)
         attention_out = fluid.layers.reshape(
             attention_out,
             shape=[-1, num_interactions,
diff --git a/models/rank/dnn/config.yaml b/models/rank/dnn/config.yaml
index 539cbb00fbb83197b120238a584ae13d348cc49e..a50329705b4c8a2f6ad5327eff587f5953cc5352 100755
--- a/models/rank/dnn/config.yaml
+++ b/models/rank/dnn/config.yaml
@@ -63,7 +63,7 @@ runner:
   device: cpu
   save_checkpoint_interval: 2 # save model interval of epochs
   save_inference_interval: 4 # save inference
-  save_checkpoint_path: "increment" # save checkpoint path
+  save_checkpoint_path: "increment_dnn" # save checkpoint path
   save_inference_path: "inference" # save inference path
   save_inference_feed_varnames: [] # feed vars of save inference
   save_inference_fetch_varnames: [] # fetch vars of save inference
@@ -77,7 +77,7 @@ runner:
   epochs: 1
   # device to run training or infer
   device: cpu
-  init_model_path: "increment/0" # load model path
+  init_model_path: "increment_dnn" # load model path
   phases: [phase2]
 
 # runner will run all the phase in each epoch
diff --git a/models/recall/fasttext/config.yaml b/models/recall/fasttext/config.yaml
index 87da67f7da5e674eafbb13758fab468c748f1a12..c9725ab8b2bb6c5a7f107acbc04a1f034322e166 100644
--- a/models/recall/fasttext/config.yaml
+++ b/models/recall/fasttext/config.yaml
@@ -11,23 +11,23 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-workspace: "paddlerec.models.recall.fasttext" 
+workspace: "paddlerec.models.recall.fasttext"
 
 # list of dataset
 dataset:
-- name: dataset_train # name of dataset to distinguish different datasets
-  batch_size: 10
-  type: DataLoader # or QueueDataset 
-  data_path: "{workspace}/data/train"
-  word_count_dict_path: "{workspace}/data/dict/word_count_dict.txt"
-  word_ngrams_path: "{workspace}/data/dict/word_ngrams_id.txt"
-  data_converter: "{workspace}/reader.py"
-- name: dataset_infer # name
-  batch_size: 10
-  type: DataLoader # or QueueDataset
-  data_path: "{workspace}/data/test"
-  word_id_dict_path: "{workspace}/data/dict/word_id_dict.txt"
-  data_converter: "{workspace}/evaluate_reader.py"
+  - name: dataset_train # name of dataset to distinguish different datasets
+    batch_size: 10
+    type: DataLoader # or QueueDataset
+    data_path: "{workspace}/data/train"
+    word_count_dict_path: "{workspace}/data/dict/word_count_dict.txt"
+    word_ngrams_path: "{workspace}/data/dict/word_ngrams_id.txt"
+    data_converter: "{workspace}/reader.py"
+  - name: dataset_infer # name
+    batch_size: 10
+    type: DataLoader # or QueueDataset
+    data_path: "{workspace}/data/test"
+    word_id_dict_path: "{workspace}/data/dict/word_id_dict.txt"
+    data_converter: "{workspace}/evaluate_reader.py"
 
 hyper_parameters:
   optimizer:
@@ -45,41 +45,41 @@ hyper_parameters:
   max_n: 5
 
 # select runner by name
-mode: train_runner
+mode: [train_runner, infer_runner]
 # config of each runner.
 # runner is a kind of paddle training class, which wraps the train/infer process.
 runner:
-- name: train_runner
-  class: train
-  # num of epochs
-  epochs: 2
-  # device to run training or infer
-  device: cpu
-  save_checkpoint_interval: 1 # save model interval of epochs
-  save_inference_interval: 1 # save inference
-  save_checkpoint_path: "increment" # save checkpoint path
-  save_inference_path: "inference" # save inference path
-  save_inference_feed_varnames: [] # feed vars of save inference
-  save_inference_fetch_varnames: [] # fetch vars of save inference
-  init_model_path: "" # load model path
-  print_interval: 1
-- name: infer_runner
-  class: single_infer
-  # num of epochs
-  epochs: 1
-  # device to run training or infer
-  device: cpu
-  init_model_path: "increment/0" # load model path
-  print_interval: 1
+  - name: train_runner
+    class: train
+    # num of epochs
+    epochs: 2
+    # device to run training or infer
+    device: cpu
+    save_checkpoint_interval: 1 # save model interval of epochs
+    save_inference_interval: 1 # save inference
+    save_checkpoint_path: "increment" # save checkpoint path
+    save_inference_path: "inference" # save inference path
+    save_inference_feed_varnames: [] # feed vars of save inference
+    save_inference_fetch_varnames: [] # fetch vars of save inference
+    init_model_path: "" # load model path
+    print_interval: 10
+    phases: [phase1]
+  - name: infer_runner
+    class: infer
+    # device to run training or infer
+    device: cpu
+    init_model_path: "increment/0" # load model path
+    print_interval: 1
+    phases: [phase2]
 
 # runner will run all the phase in each epoch
 phase:
-- name: phase1
-  model: "{workspace}/model.py" # user-defined model
-  dataset_name: dataset_train # select dataset by name
-  thread_num: 1
-  gradient_scale_strategy: 1
-# - name: phase2
-#   model: "{workspace}/model.py" # user-defined model
-#   dataset_name: dataset_infer # select dataset by name
-#   thread_num: 1
+  - name: phase1
+    model: "{workspace}/model.py" # user-defined model
+    dataset_name: dataset_train # select dataset by name
+    thread_num: 1
+    gradient_scale_strategy: 1
+  - name: phase2
+    model: "{workspace}/model.py" # user-defined model
+    dataset_name: dataset_infer # select dataset by name
+    thread_num: 1
diff --git a/models/recall/gnn/evaluate_reader.py b/models/recall/gnn/evaluate_reader.py
index 864d0047d325fc230c5ae10fd1df939375468d94..6ea0efc995037fb11e51c164016bb6349c3e57b0 100755
--- a/models/recall/gnn/evaluate_reader.py
+++ b/models/recall/gnn/evaluate_reader.py
@@ -36,7 +36,8 @@ class Reader(ReaderBase):
                 for line in fin:
                     line = line.strip().split('\t')
                     res.append(
-                        tuple([map(int, line[0].split(',')), int(line[1])]))
+                        tuple([[int(l)
+                                for l in line[0].split(',')], int(line[1])]))
         return res
 
     def make_data(self, cur_batch, batch_size):
diff --git a/models/recall/gnn/reader.py b/models/recall/gnn/reader.py
index 5ea4cfeef1513f2a76378e4341863fa9e3880460..9e382aea2f5a96ef81fc40291487040d506cc80b 100755
--- a/models/recall/gnn/reader.py
+++ b/models/recall/gnn/reader.py
@@ -35,7 +35,8 @@ class Reader(ReaderBase):
                 for line in fin:
                     line = line.strip().split('\t')
                     res.append(
-                        tuple([map(int, line[0].split(',')), int(line[1])]))
+                        tuple([[int(l)
+                                for l in line[0].split(',')], int(line[1])]))
         return res
 
     def make_data(self, cur_batch, batch_size):
diff --git a/run.py b/run.py
index 1abefd5f391ee30591d2dd3a3e583927b1bd4f11..699d48f9addfb5baf294c082eb924caa537b0536 100755
--- a/run.py
+++ b/run.py
@@ -17,6 +17,7 @@ import subprocess
 import sys
 import argparse
 import tempfile
+import warnings
 
 import copy
 from paddlerec.core.factory import TrainerFactory
@@ -220,6 +221,14 @@ def single_infer_engine(args):
     device_class = ".".join(["runner", mode, "device"])
     selected_gpus_class = ".".join(["runner", mode, "selected_gpus"])
 
+    epochs_class = ".".join(["runner", mode, "epochs"])
+    epochs = run_extras.get(epochs_class, 1)
+    if epochs > 1:
+        warnings.warn(
+            "It makes no sense to predict the same model for multiple epochs",
+            category=UserWarning,
+            stacklevel=2)
+
     trainer = run_extras.get(trainer_class, "GeneralTrainer")
     fleet_mode = run_extras.get(fleet_class, "ps")
     device = run_extras.get(device_class, "cpu")
@@ -372,9 +381,19 @@ def local_cluster_engine(args):
             envs.workspace_adapter_by_specific(path, workspace)
             for path in datapaths
         ]
+
         all_workers = [len(os.listdir(path)) for path in datapaths]
         all_workers.append(workers)
-        return min(all_workers)
+        max_worker_num = min(all_workers)
+
+        if max_worker_num >= workers:
+            return workers
+
+        print(
+            "phases do not have enough datas for training, set worker/gpu cards num from {} to {}".
+            format(workers, max_worker_num))
+
+        return max_worker_num
 
     from paddlerec.core.engine.local_cluster import LocalClusterEngine
 
@@ -397,24 +416,31 @@ def local_cluster_engine(args):
 
     worker_num = run_extras.get(worker_class, 1)
     server_num = run_extras.get(server_class, 1)
-    max_worker_num = get_worker_num(run_extras, worker_num)
-
-    if max_worker_num < worker_num:
-        print(
-            "has phase do not have enough datas for training, set worker num from {} to {}".
-            format(worker_num, max_worker_num))
-        worker_num = max_worker_num
 
     device = device.upper()
     fleet_mode = fleet_mode.upper()
 
+    cluster_envs = {}
+
+    # Todo: delete follow hard code when paddle support ps-gpu.
+    if device == "CPU":
+        fleet_mode = "PS"
+    elif device == "GPU":
+        fleet_mode = "COLLECTIVE"
+    if fleet_mode == "PS" and device != "CPU":
+        raise ValueError("PS can not be used with GPU")
+
     if fleet_mode == "COLLECTIVE" and device != "GPU":
-        raise ValueError("COLLECTIVE can not be used with GPU")
+        raise ValueError("COLLECTIVE can not be used without GPU")
 
-    cluster_envs = {}
+    if fleet_mode == "PS":
+        worker_num = get_worker_num(run_extras, worker_num)
 
-    if device == "GPU":
+    if fleet_mode == "COLLECTIVE":
         cluster_envs["selected_gpus"] = selected_gpus
+        gpus = selected_gpus.split(",")
+        gpu_num = get_worker_num(run_extras, len(gpus))
+        cluster_envs["selected_gpus"] = ','.join(gpus[:gpu_num])
 
     cluster_envs["server_num"] = server_num
     cluster_envs["worker_num"] = worker_num