diff --git a/core/model.py b/core/model.py
index 30bbb7fc327f1df236aeee181ebbb0a7fca0b930..83181875fa3eb64d9c4085aa68356ade6f2ef720 100755
--- a/core/model.py
+++ b/core/model.py
@@ -35,7 +35,6 @@ class ModelBase(object):
         self._data_loader = None
         self._infer_data_loader = None
         self._fetch_interval = 20
-        self._namespace = "train.model"
         self._platform = envs.get_platform()
         self._init_hyper_parameters()
         self._env = config
@@ -50,11 +49,11 @@ class ModelBase(object):
         self._slot_inited = True
         dataset = {}
         model_dict = {}
-        for i in self._env["executor"]:
+        for i in envs.get_global_env("phase"):
             if i["name"] == kargs["name"]:
                 model_dict = i
                 break
-        for i in self._env["dataset"]:
+        for i in envs.get_global_env("dataset"):
             if i["name"] == model_dict["dataset_name"]:
                 dataset = i
                 break
@@ -139,8 +138,7 @@ class ModelBase(object):
             os.environ["FLAGS_communicator_is_sgd_optimizer"] = '0'
 
         if name == "SGD":
-            reg = envs.get_global_env("hyper_parameters.reg", 0.0001,
-                                      self._namespace)
+            reg = envs.get_global_env("hyper_parameters.reg", 0.0001)
             optimizer_i = fluid.optimizer.SGD(
                 lr, regularization=fluid.regularizer.L2DecayRegularizer(reg))
         elif name == "ADAM":
diff --git a/core/trainer.py b/core/trainer.py
index 116368b864d7048b0ac506faa7921e791f3b4051..53a9cc1eb89e6eda2d08bc8f684bc4e8e4441e5c 100755
--- a/core/trainer.py
+++ b/core/trainer.py
@@ -64,26 +64,21 @@ class Trainer(object):
         self.increment_models = []
         self._exector_context = {}
         self._context = {'status': 'uninit', 'is_exit': False}
-        self._config_yaml = config
-        self._context["config_yaml"] = self._config_yaml
+        self._context["config_yaml"] = config
 
-        self._config = envs.load_yaml(config)
-
-        self._context["env"] = self._config
         self._model = {}
         self._dataset = {}
-        envs.set_global_envs(self._config)
-        envs.update_workspace()
+
         self._runner_name = envs.get_runtime_environ("mode")
         self._context["runner_name"] = self._runner_name
 
-        phase_names = self._config.get(
+        phase_names = envs.get_global_env(
             "runner." + self._runner_name + ".phases", None)
         phases = []
         if phase_names is None:
-            phases = self._config.get("phase")
+            phases = envs.get_global_env("phase")
         else:
-            for phase in self._config.get("phase"):
+            for phase in envs.get_global_env("phase"):
                 if phase["name"] in phase_names:
                     phases.append(phase)
 
@@ -100,19 +95,21 @@ class Trainer(object):
         """
         device = envs.get_global_env(
             "runner." + self._runner_name + ".device", default_value="CPU")
-        if device.upper() == 'GPU':
+        device = device.upper()
+
+        if device == 'GPU':
             self.check_gpu()
             self.device = Device.GPU
             gpu_id = int(os.environ.get('FLAGS_selected_gpus', 0))
             self._place = fluid.CUDAPlace(gpu_id)
             self._exe = fluid.Executor(self._place)
-        elif device.upper() == "CPU":
+        elif device == "CPU":
             self.device = Device.CPU
             self._place = fluid.CPUPlace()
             self._exe = fluid.Executor(self._place)
         else:
             raise ValueError("Not Support device {}".format(device))
-        self._context["device"] = device.upper()
+        self._context["device"] = device
         self._context["exe"] = self._exe
         self._context["place"] = self._place
 
@@ -130,7 +127,6 @@ class Trainer(object):
         try:
             if not fluid.is_compiled_with_cuda():
                 raise RuntimeError(err)
-                sys.exit(1)
         except Exception as e:
             pass
 
diff --git a/core/trainers/framework/network.py b/core/trainers/framework/network.py
index b3428b0bf82c8a377d351d69c048afc0a27c5d8d..b012fb7d31e1e8f944df4d575a57e658d560d161 100644
--- a/core/trainers/framework/network.py
+++ b/core/trainers/framework/network.py
@@ -58,11 +58,9 @@ class SingleNetwork(NetworkBase):
             with fluid.program_guard(train_program, startup_program):
                 with fluid.unique_name.guard():
                     with fluid.scope_guard(scope):
-                        model_path = model_dict["model"].replace(
-                            "{workspace}",
-                            envs.path_adapter(context["env"]["workspace"]))
-                        model = envs.lazy_instance_by_fliename(
-                            model_path, "Model")(context["env"])
+                        model_path = model_dict["model"]
+                        model = envs.lazy_instance_by_fliename(model_path,
+                                                               "Model")(None)
 
                         if context["is_infer"]:
                             model._infer_data_var = model.input_data(
@@ -97,7 +95,7 @@ class SingleNetwork(NetworkBase):
                 "default_main_program"] = train_program.clone()
 
         context["dataset"] = {}
-        for dataset in context["env"]["dataset"]:
+        for dataset in envs.get_global_env("dataset"):
             if dataset["type"] != "DataLoader":
                 dataset_class = QueueDataset(context)
                 context["dataset"][dataset[
@@ -114,19 +112,17 @@ class PSNetwork(NetworkBase):
 
     def build_network(self, context):
         context["model"] = {}
-        if len(context["env"]["phase"]) > 1:
+        if len(envs.get_global_env("phase")) > 1:
             warnings.warn(
                 "Cluster Train Only Support One Phase.",
                 category=UserWarning,
                 stacklevel=2)
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         context["model"][model_dict["name"]] = {}
         dataset_name = model_dict["dataset_name"]
 
-        model_path = model_dict["model"].replace(
-            "{workspace}", envs.path_adapter(context["env"]["workspace"]))
-        model = envs.lazy_instance_by_fliename(model_path,
-                                               "Model")(context["env"])
+        model_path = model_dict["model"]
+        model = envs.lazy_instance_by_fliename(model_path, "Model")(None)
         model._data_var = model.input_data(
             dataset_name=model_dict["dataset_name"])
         if envs.get_global_env("dataset." + dataset_name +
@@ -155,7 +151,7 @@ class PSNetwork(NetworkBase):
         else:
             context["fleet"].init_worker()
             context["dataset"] = {}
-            for dataset in context["env"]["dataset"]:
+            for dataset in envs.get_global_env("dataset"):
                 if dataset["type"] != "DataLoader":
                     dataset_class = QueueDataset(context)
                     context["dataset"][dataset[
@@ -201,12 +197,12 @@ class PslibNetwork(NetworkBase):
 
     def build_network(self, context):
         context["model"] = {}
-        if len(context["env"]["phase"]) > 1:
+        if len(envs.get_global_env("phase")) > 1:
             warnings.warn(
                 "Cluster Train Only Support One Phase.",
                 category=UserWarning,
                 stacklevel=2)
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         train_program = fluid.Program()
         startup_program = fluid.Program()
         scope = fluid.Scope()
@@ -216,12 +212,9 @@ class PslibNetwork(NetworkBase):
             with fluid.unique_name.guard():
                 with fluid.scope_guard(scope):
                     context["model"][model_dict["name"]] = {}
-
-                    model_path = model_dict["model"].replace(
-                        "{workspace}",
-                        envs.path_adapter(context["env"]["workspace"]))
-                    model = envs.lazy_instance_by_fliename(
-                        model_path, "Model")(context["env"])
+                    model_path = model_dict["model"]
+                    model = envs.lazy_instance_by_fliename(model_path,
+                                                           "Model")(None)
                     model._data_var = model.input_data(
                         dataset_name=model_dict["dataset_name"])
                     if envs.get_global_env("dataset." + dataset_name +
@@ -250,7 +243,7 @@ class PslibNetwork(NetworkBase):
             self._server(context)
         else:
             context["dataset"] = {}
-            for dataset in context["env"]["dataset"]:
+            for dataset in envs.get_global_env("dataset"):
                 if dataset["type"] != "DataLoader":
                     dataset_class = QueueDataset(context)
                     context["dataset"][dataset[
@@ -270,12 +263,12 @@ class CollectiveNetwork(NetworkBase):
 
     def build_network(self, context):
         context["model"] = {}
-        if len(context["env"]["phase"]) > 1:
+        if len(envs.get_global_env("phase")) > 1:
             warnings.warn(
                 "Cluster Train Only Support One Phase.",
                 category=UserWarning,
                 stacklevel=2)
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         context["model"][model_dict["name"]] = {}
         dataset_name = model_dict["dataset_name"]
 
@@ -284,11 +277,9 @@ class CollectiveNetwork(NetworkBase):
         scope = fluid.Scope()
         with fluid.program_guard(train_program, startup_program):
             with fluid.scope_guard(scope):
-                model_path = model_dict["model"].replace(
-                    "{workspace}",
-                    envs.path_adapter(context["env"]["workspace"]))
+                model_path = model_dict["model"]
                 model = envs.lazy_instance_by_fliename(model_path,
-                                                       "Model")(context["env"])
+                                                       "Model")(None)
                 model._data_var = model.input_data(
                     dataset_name=model_dict["dataset_name"])
                 if envs.get_global_env("dataset." + dataset_name +
@@ -314,7 +305,7 @@ class CollectiveNetwork(NetworkBase):
                     "default_main_program"] = train_program
 
         context["dataset"] = {}
-        for dataset in context["env"]["dataset"]:
+        for dataset in envs.get_global_env("dataset"):
             if dataset["type"] != "DataLoader":
                 dataset_class = QueueDataset(context)
                 context["dataset"][dataset[
diff --git a/core/trainers/framework/runner.py b/core/trainers/framework/runner.py
index 8805c6fb79b3e75058339621302b4834a63da021..dbcf40d3a3fd9277f39cbfb8499b6ce73e1e127d 100644
--- a/core/trainers/framework/runner.py
+++ b/core/trainers/framework/runner.py
@@ -40,6 +40,7 @@ class RunnerBase(object):
     def _run(self, context, model_dict):
         reader_name = model_dict["dataset_name"]
         name = "dataset." + reader_name + "."
+
         if envs.get_global_env(name + "type") == "DataLoader":
             self._executor_dataloader_train(model_dict, context)
         else:
@@ -309,7 +310,7 @@ class PSRunner(RunnerBase):
         epochs = int(
             envs.get_global_env("runner." + context["runner_name"] +
                                 ".epochs"))
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         for epoch in range(epochs):
             begin_time = time.time()
             self._run(context, model_dict)
@@ -336,7 +337,7 @@ class CollectiveRunner(RunnerBase):
         epochs = int(
             envs.get_global_env("runner." + context["runner_name"] +
                                 ".epochs"))
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         for epoch in range(epochs):
             begin_time = time.time()
             self._run(context, model_dict)
@@ -361,7 +362,7 @@ class PslibRunner(RunnerBase):
 
     def run(self, context):
         context["fleet"].init_worker()
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         epochs = int(
             envs.get_global_env("runner." + context["runner_name"] +
                                 ".epochs"))
@@ -382,7 +383,7 @@ class PslibRunner(RunnerBase):
                 day = begin_day + datetime.timedelta(days=day, hours=hour)
                 day_s = day.strftime('%Y%m%d/%H')
 
-                for dataset in context["env"]["dataset"]:
+                for dataset in envs.get_global_env("dataset"):
                     if dataset["type"] != "DataLoader":
                         name = dataset["name"]
                         train_data_path = envs.get_global_env(name +
diff --git a/core/trainers/framework/startup.py b/core/trainers/framework/startup.py
index 82e244723ecae607eb8cfc1110c0a29642bd4615..ea3558072bb1d61ecb9d63c07ff5d6b71a37ea22 100644
--- a/core/trainers/framework/startup.py
+++ b/core/trainers/framework/startup.py
@@ -73,7 +73,7 @@ class PSStartup(StartupBase):
         pass
 
     def startup(self, context):
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         with fluid.scope_guard(context["model"][model_dict["name"]]["scope"]):
 
             train_prog = context["model"][model_dict["name"]]["main_program"]
@@ -91,7 +91,7 @@ class CollectiveStartup(StartupBase):
         pass
 
     def startup(self, context):
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         with fluid.scope_guard(context["model"][model_dict["name"]]["scope"]):
             train_prog = context["model"][model_dict["name"]][
                 "default_main_program"]
diff --git a/core/trainers/single_infer.py b/core/trainers/single_infer.py
deleted file mode 100755
index fcc92e2e01cf7af49d6d124a7a5773ac9946c989..0000000000000000000000000000000000000000
--- a/core/trainers/single_infer.py
+++ /dev/null
@@ -1,371 +0,0 @@
-# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# 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.
-"""
-Training use fluid with one node only.
-"""
-
-from __future__ import print_function
-
-import time
-import logging
-import os
-import json
-import numpy as np
-import paddle.fluid as fluid
-
-from paddlerec.core.trainers.transpiler_trainer import TranspileTrainer
-from paddlerec.core.utils import envs
-from paddlerec.core.reader import SlotReader
-from paddlerec.core.utils import dataloader_instance
-
-logging.basicConfig(format="%(asctime)s - %(levelname)s - %(message)s")
-logger = logging.getLogger("fluid")
-logger.setLevel(logging.INFO)
-
-
-class SingleInfer(TranspileTrainer):
-    def __init__(self, config=None):
-        super(TranspileTrainer, self).__init__(config)
-        self._env = self._config
-        device = envs.get_global_env("device")
-        if device == 'gpu':
-            self._place = fluid.CUDAPlace(0)
-        elif device == 'cpu':
-            self._place = fluid.CPUPlace()
-        self._exe = fluid.Executor(self._place)
-        self.processor_register()
-        self._model = {}
-        self._dataset = {}
-        envs.set_global_envs(self._config)
-        envs.update_workspace()
-        self._runner_name = envs.get_global_env("mode")
-        device = envs.get_global_env("runner." + self._runner_name + ".device")
-        if device == 'gpu':
-            self._place = fluid.CUDAPlace(0)
-        elif device == 'cpu':
-            self._place = fluid.CPUPlace()
-        self._exe = fluid.Executor(self._place)
-
-    def processor_register(self):
-        self.regist_context_processor('uninit', self.instance)
-        self.regist_context_processor('init_pass', self.init)
-        self.regist_context_processor('startup_pass', self.startup)
-        self.regist_context_processor('train_pass', self.executor_train)
-        self.regist_context_processor('terminal_pass', self.terminal)
-
-    def instance(self, context):
-        context['status'] = 'init_pass'
-
-    def _get_dataset(self, dataset_name):
-        name = "dataset." + dataset_name + "."
-        thread_num = envs.get_global_env(name + "thread_num")
-        batch_size = envs.get_global_env(name + "batch_size")
-        reader_class = envs.get_global_env(name + "data_converter")
-        abs_dir = os.path.dirname(os.path.abspath(__file__))
-        reader = os.path.join(abs_dir, '../utils', 'dataset_instance.py')
-        sparse_slots = envs.get_global_env(name + "sparse_slots", "").strip()
-        dense_slots = envs.get_global_env(name + "dense_slots", "").strip()
-        if sparse_slots == "" and dense_slots == "":
-            pipe_cmd = "python {} {} {} {}".format(reader, reader_class,
-                                                   "TRAIN", self._config_yaml)
-        else:
-            if sparse_slots == "":
-                sparse_slots = "?"
-            if dense_slots == "":
-                dense_slots = "?"
-            padding = envs.get_global_env(name + "padding", 0)
-            pipe_cmd = "python {} {} {} {} {} {} {} {}".format(
-                reader, "slot", "slot", self._config_yaml, "fake", \
-                sparse_slots.replace(" ", "?"), dense_slots.replace(" ", "?"), str(padding))
-
-        dataset = fluid.DatasetFactory().create_dataset()
-        dataset.set_batch_size(envs.get_global_env(name + "batch_size"))
-        dataset.set_pipe_command(pipe_cmd)
-        train_data_path = envs.get_global_env(name + "data_path")
-        file_list = [
-            os.path.join(train_data_path, x)
-            for x in os.listdir(train_data_path)
-        ]
-        dataset.set_filelist(file_list)
-        for model_dict in self._env["phase"]:
-            if model_dict["dataset_name"] == dataset_name:
-                model = self._model[model_dict["name"]][3]
-                inputs = model._infer_data_var
-                dataset.set_use_var(inputs)
-                break
-        return dataset
-
-    def _get_dataloader(self, dataset_name, dataloader):
-        name = "dataset." + dataset_name + "."
-        thread_num = envs.get_global_env(name + "thread_num")
-        batch_size = envs.get_global_env(name + "batch_size")
-        reader_class = envs.get_global_env(name + "data_converter")
-        abs_dir = os.path.dirname(os.path.abspath(__file__))
-        sparse_slots = envs.get_global_env(name + "sparse_slots", "").strip()
-        dense_slots = envs.get_global_env(name + "dense_slots", "").strip()
-        if sparse_slots == "" and dense_slots == "":
-            reader = dataloader_instance.dataloader_by_name(
-                reader_class, dataset_name, self._config_yaml)
-            reader_class = envs.lazy_instance_by_fliename(reader_class,
-                                                          "TrainReader")
-            reader_ins = reader_class(self._config_yaml)
-        else:
-            reader = dataloader_instance.slotdataloader_by_name(
-                "", dataset_name, self._config_yaml)
-            reader_ins = SlotReader(self._config_yaml)
-        if hasattr(reader_ins, 'generate_batch_from_trainfiles'):
-            dataloader.set_sample_list_generator(reader)
-        else:
-            dataloader.set_sample_generator(reader, batch_size)
-        return dataloader
-
-    def _create_dataset(self, dataset_name):
-        name = "dataset." + dataset_name + "."
-        sparse_slots = envs.get_global_env(name + "sparse_slots")
-        dense_slots = envs.get_global_env(name + "dense_slots")
-        thread_num = envs.get_global_env(name + "thread_num")
-        batch_size = envs.get_global_env(name + "batch_size")
-        type_name = envs.get_global_env(name + "type")
-        if envs.get_platform() != "LINUX":
-            print("platform ", envs.get_platform(),
-                  " change reader to DataLoader")
-            type_name = "DataLoader"
-        padding = 0
-
-        if type_name == "DataLoader":
-            return None
-        else:
-            return self._get_dataset(dataset_name)
-
-    def init(self, context):
-        for model_dict in self._env["phase"]:
-            self._model[model_dict["name"]] = [None] * 5
-            train_program = fluid.Program()
-            startup_program = fluid.Program()
-            scope = fluid.Scope()
-            dataset_name = model_dict["dataset_name"]
-            opt_name = envs.get_global_env("hyper_parameters.optimizer.class")
-            opt_lr = envs.get_global_env(
-                "hyper_parameters.optimizer.learning_rate")
-            opt_strategy = envs.get_global_env(
-                "hyper_parameters.optimizer.strategy")
-            with fluid.program_guard(train_program, startup_program):
-                with fluid.unique_name.guard():
-                    with fluid.scope_guard(scope):
-                        model_path = model_dict["model"].replace(
-                            "{workspace}",
-                            envs.path_adapter(self._env["workspace"]))
-                        model = envs.lazy_instance_by_fliename(
-                            model_path, "Model")(self._env)
-                        model._infer_data_var = model.input_data(
-                            is_infer=True,
-                            dataset_name=model_dict["dataset_name"])
-                        if envs.get_global_env("dataset." + dataset_name +
-                                               ".type") == "DataLoader":
-                            model._init_dataloader(is_infer=True)
-                            self._get_dataloader(dataset_name,
-                                                 model._data_loader)
-                        model.net(model._infer_data_var, True)
-            self._model[model_dict["name"]][0] = train_program
-            self._model[model_dict["name"]][1] = startup_program
-            self._model[model_dict["name"]][2] = scope
-            self._model[model_dict["name"]][3] = model
-            self._model[model_dict["name"]][4] = train_program.clone()
-
-        for dataset in self._env["dataset"]:
-            if dataset["type"] != "DataLoader":
-                self._dataset[dataset["name"]] = self._create_dataset(dataset[
-                    "name"])
-
-        context['status'] = 'startup_pass'
-
-    def startup(self, context):
-        for model_dict in self._env["phase"]:
-            with fluid.scope_guard(self._model[model_dict["name"]][2]):
-                self._exe.run(self._model[model_dict["name"]][1])
-        context['status'] = 'train_pass'
-
-    def executor_train(self, context):
-        epochs = int(
-            envs.get_global_env("runner." + self._runner_name + ".epochs"))
-        for j in range(epochs):
-            for model_dict in self._env["phase"]:
-                if j == 0:
-                    with fluid.scope_guard(self._model[model_dict["name"]][2]):
-                        train_prog = self._model[model_dict["name"]][0]
-                        startup_prog = self._model[model_dict["name"]][1]
-                        with fluid.program_guard(train_prog, startup_prog):
-                            self.load()
-                reader_name = model_dict["dataset_name"]
-                name = "dataset." + reader_name + "."
-                begin_time = time.time()
-                if envs.get_global_env(name + "type") == "DataLoader":
-                    self._executor_dataloader_train(model_dict)
-                else:
-                    self._executor_dataset_train(model_dict)
-                with fluid.scope_guard(self._model[model_dict["name"]][2]):
-                    train_prog = self._model[model_dict["name"]][4]
-                    startup_prog = self._model[model_dict["name"]][1]
-                    with fluid.program_guard(train_prog, startup_prog):
-                        self.save(j)
-                end_time = time.time()
-                seconds = end_time - begin_time
-            print("epoch {} done, time elasped: {}".format(j, seconds))
-        context['status'] = "terminal_pass"
-
-    def _executor_dataset_train(self, model_dict):
-        reader_name = model_dict["dataset_name"]
-        model_name = model_dict["name"]
-        model_class = self._model[model_name][3]
-        fetch_vars = []
-        fetch_alias = []
-        fetch_period = int(
-            envs.get_global_env("runner." + self._runner_name +
-                                ".print_interval", 20))
-        metrics = model_class.get_infer_results()
-        if metrics:
-            fetch_vars = metrics.values()
-            fetch_alias = metrics.keys()
-        scope = self._model[model_name][2]
-        program = self._model[model_name][0]
-        reader = self._dataset[reader_name]
-        with fluid.scope_guard(scope):
-            self._exe.infer_from_dataset(
-                program=program,
-                dataset=reader,
-                fetch_list=fetch_vars,
-                fetch_info=fetch_alias,
-                print_period=fetch_period)
-
-    def _executor_dataloader_train(self, model_dict):
-        reader_name = model_dict["dataset_name"]
-        model_name = model_dict["name"]
-        model_class = self._model[model_name][3]
-        program = self._model[model_name][0].clone()
-        fetch_vars = []
-        fetch_alias = []
-        metrics = model_class.get_infer_results()
-        if metrics:
-            fetch_vars = metrics.values()
-            fetch_alias = metrics.keys()
-        metrics_varnames = []
-        metrics_format = []
-        fetch_period = int(
-            envs.get_global_env("runner." + self._runner_name +
-                                ".print_interval", 20))
-        metrics_format.append("{}: {{}}".format("batch"))
-        metrics_indexes = dict()
-        for name, var in metrics.items():
-            metrics_varnames.append(var.name)
-            metrics_indexes[var.name] = len(metrics_varnames) - 1
-            metrics_format.append("{}: {{}}".format(name))
-        metrics_format = ", ".join(metrics_format)
-
-        reader = self._model[model_name][3]._data_loader
-        reader.start()
-        batch_id = 0
-        scope = self._model[model_name][2]
-
-        infer_results = []
-        with fluid.scope_guard(scope):
-            try:
-                while True:
-                    metrics_rets = self._exe.run(program=program,
-                                                 fetch_list=metrics_varnames,
-                                                 return_numpy=False)
-                    metrics = [batch_id]
-                    metrics.extend(metrics_rets)
-
-                    batch_infer_result = {}
-                    for k, v in metrics_indexes.items():
-                        batch_infer_result[k] = np.array(metrics_rets[
-                            v]).tolist()
-                    infer_results.append(batch_infer_result)
-
-                    if batch_id % fetch_period == 0 and batch_id != 0:
-                        print(metrics_format.format(*metrics))
-                    batch_id += 1
-            except fluid.core.EOFException:
-                reader.reset()
-        with open(model_dict['save_path'], 'w') as fout:
-            json.dump(infer_results, fout)
-
-    def terminal(self, context):
-        context['is_exit'] = True
-
-    def load(self, is_fleet=False):
-        name = "runner." + self._runner_name + "."
-        dirname = envs.get_global_env(name + "init_model_path", None)
-        if dirname is None or dirname == "":
-            return
-        print("single_infer going to load ", dirname)
-        if is_fleet:
-            fleet.load_persistables(self._exe, dirname)
-        else:
-            fluid.io.load_persistables(self._exe, dirname)
-
-    def save(self, epoch_id, is_fleet=False):
-        def need_save(epoch_id, epoch_interval, is_last=False):
-            if is_last:
-                return True
-            if epoch_id == -1:
-                return False
-
-            return epoch_id % epoch_interval == 0
-
-        def save_inference_model():
-            name = "runner." + self._runner_name + "."
-            save_interval = int(
-                envs.get_global_env(name + "save_inference_interval", -1))
-            if not need_save(epoch_id, save_interval, False):
-                return
-            feed_varnames = envs.get_global_env(
-                name + "save_inference_feed_varnames", None)
-            fetch_varnames = envs.get_global_env(
-                name + "save_inference_fetch_varnames", None)
-            if feed_varnames is None or fetch_varnames is None or feed_varnames == "":
-                return
-            fetch_vars = [
-                fluid.default_main_program().global_block().vars[varname]
-                for varname in fetch_varnames
-            ]
-            dirname = envs.get_global_env(name + "save_inference_path", None)
-
-            assert dirname is not None
-            dirname = os.path.join(dirname, str(epoch_id))
-
-            if is_fleet:
-                fleet.save_inference_model(self._exe, dirname, feed_varnames,
-                                           fetch_vars)
-            else:
-                fluid.io.save_inference_model(dirname, feed_varnames,
-                                              fetch_vars, self._exe)
-
-        def save_persistables():
-            name = "runner." + self._runner_name + "."
-            save_interval = int(
-                envs.get_global_env(name + "save_checkpoint_interval", -1))
-            if not need_save(epoch_id, save_interval, False):
-                return
-            dirname = envs.get_global_env(name + "save_checkpoint_path", None)
-            if dirname is None or dirname == "":
-                return
-            dirname = os.path.join(dirname, str(epoch_id))
-            if is_fleet:
-                fleet.save_persistables(self._exe, dirname)
-            else:
-                fluid.io.save_persistables(self._exe, dirname)
-
-        save_persistables()
-        save_inference_model()
diff --git a/core/trainers/single_trainer.py b/core/trainers/single_trainer.py
deleted file mode 100755
index d782dfa42f5695c8b04e9e2db6ba92b676b8b0f6..0000000000000000000000000000000000000000
--- a/core/trainers/single_trainer.py
+++ /dev/null
@@ -1,391 +0,0 @@
-# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# 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.
-"""
-Training use fluid with one node only.
-"""
-
-from __future__ import print_function
-
-import time
-import logging
-import os
-import paddle.fluid as fluid
-
-from paddlerec.core.trainers.transpiler_trainer import TranspileTrainer
-from paddlerec.core.utils import envs
-from paddlerec.core.reader import SlotReader
-from paddlerec.core.utils import dataloader_instance
-
-logging.basicConfig(format="%(asctime)s - %(levelname)s - %(message)s")
-logger = logging.getLogger("fluid")
-logger.setLevel(logging.INFO)
-
-
-class SingleTrainer(TranspileTrainer):
-    def __init__(self, config=None):
-        super(TranspileTrainer, self).__init__(config)
-        self._env = self._config
-        self.processor_register()
-        self._model = {}
-        self._dataset = {}
-        envs.set_global_envs(self._config)
-        envs.update_workspace()
-        self._runner_name = envs.get_global_env("mode")
-        device = envs.get_global_env("runner." + self._runner_name + ".device")
-        if device == 'gpu':
-            self._place = fluid.CUDAPlace(0)
-        elif device == 'cpu':
-            self._place = fluid.CPUPlace()
-        self._exe = fluid.Executor(self._place)
-
-    def processor_register(self):
-        self.regist_context_processor('uninit', self.instance)
-        self.regist_context_processor('init_pass', self.init)
-        self.regist_context_processor('startup_pass', self.startup)
-        self.regist_context_processor('train_pass', self.executor_train)
-        self.regist_context_processor('terminal_pass', self.terminal)
-
-    def instance(self, context):
-        context['status'] = 'init_pass'
-
-    def _get_dataset(self, dataset_name):
-        name = "dataset." + dataset_name + "."
-        thread_num = envs.get_global_env(name + "thread_num")
-        batch_size = envs.get_global_env(name + "batch_size")
-        reader_class = envs.get_global_env(name + "data_converter")
-        abs_dir = os.path.dirname(os.path.abspath(__file__))
-        reader = os.path.join(abs_dir, '../utils', 'dataset_instance.py')
-        sparse_slots = envs.get_global_env(name + "sparse_slots", "").strip()
-        dense_slots = envs.get_global_env(name + "dense_slots", "").strip()
-        if sparse_slots == "" and dense_slots == "":
-            pipe_cmd = "python {} {} {} {}".format(reader, reader_class,
-                                                   "TRAIN", self._config_yaml)
-        else:
-            if sparse_slots == "":
-                sparse_slots = "?"
-            if dense_slots == "":
-                dense_slots = "?"
-            padding = envs.get_global_env(name + "padding", 0)
-            pipe_cmd = "python {} {} {} {} {} {} {} {}".format(
-                reader, "slot", "slot", self._config_yaml, "fake", \
-                sparse_slots.replace(" ", "?"), dense_slots.replace(" ", "?"), str(padding))
-
-        dataset = fluid.DatasetFactory().create_dataset()
-        dataset.set_batch_size(envs.get_global_env(name + "batch_size"))
-        dataset.set_pipe_command(pipe_cmd)
-        train_data_path = envs.get_global_env(name + "data_path")
-        file_list = [
-            os.path.join(train_data_path, x)
-            for x in os.listdir(train_data_path)
-        ]
-        dataset.set_filelist(file_list)
-        for model_dict in self._env["phase"]:
-            if model_dict["dataset_name"] == dataset_name:
-                model = self._model[model_dict["name"]][3]
-                inputs = model._data_var
-                dataset.set_use_var(inputs)
-                break
-        return dataset
-
-    def _get_dataloader(self, dataset_name, dataloader):
-        name = "dataset." + dataset_name + "."
-        sparse_slots = envs.get_global_env(name + "sparse_slots", "").strip()
-        dense_slots = envs.get_global_env(name + "dense_slots", "").strip()
-        thread_num = envs.get_global_env(name + "thread_num")
-        batch_size = envs.get_global_env(name + "batch_size")
-        reader_class = envs.get_global_env(name + "data_converter")
-        abs_dir = os.path.dirname(os.path.abspath(__file__))
-        if sparse_slots == "" and dense_slots == "":
-            reader = dataloader_instance.dataloader_by_name(
-                reader_class, dataset_name, self._config_yaml)
-            reader_class = envs.lazy_instance_by_fliename(reader_class,
-                                                          "TrainReader")
-            reader_ins = reader_class(self._config_yaml)
-        else:
-            reader = dataloader_instance.slotdataloader_by_name(
-                "", dataset_name, self._config_yaml)
-            reader_ins = SlotReader(self._config_yaml)
-        if hasattr(reader_ins, 'generate_batch_from_trainfiles'):
-            dataloader.set_sample_list_generator(reader)
-        else:
-            dataloader.set_sample_generator(reader, batch_size)
-        return dataloader
-
-    def _create_dataset(self, dataset_name):
-        name = "dataset." + dataset_name + "."
-        sparse_slots = envs.get_global_env(name + "sparse_slots", "").strip()
-        dense_slots = envs.get_global_env(name + "dense_slots", "").strip()
-        thread_num = envs.get_global_env(name + "thread_num")
-        batch_size = envs.get_global_env(name + "batch_size")
-        type_name = envs.get_global_env(name + "type")
-        if envs.get_platform() != "LINUX":
-            print("platform ", envs.get_platform(),
-                  " change reader to DataLoader")
-            type_name = "DataLoader"
-        padding = 0
-
-        if type_name == "DataLoader":
-            return None
-        else:
-            return self._get_dataset(dataset_name)
-
-    def init(self, context):
-        for model_dict in self._env["phase"]:
-            self._model[model_dict["name"]] = [None] * 5
-            train_program = fluid.Program()
-            startup_program = fluid.Program()
-            scope = fluid.Scope()
-            dataset_name = model_dict["dataset_name"]
-            with fluid.program_guard(train_program, startup_program):
-                with fluid.unique_name.guard():
-                    with fluid.scope_guard(scope):
-                        model_path = model_dict["model"].replace(
-                            "{workspace}",
-                            envs.path_adapter(self._env["workspace"]))
-                        model = envs.lazy_instance_by_fliename(
-                            model_path, "Model")(self._env)
-                        model._data_var = model.input_data(
-                            dataset_name=model_dict["dataset_name"])
-                        if envs.get_global_env("dataset." + dataset_name +
-                                               ".type") == "DataLoader":
-                            model._init_dataloader(is_infer=False)
-                            self._get_dataloader(dataset_name,
-                                                 model._data_loader)
-                        model.net(model._data_var, False)
-                        optimizer = model.optimizer()
-                        optimizer.minimize(model._cost)
-            self._model[model_dict["name"]][0] = train_program
-            self._model[model_dict["name"]][1] = startup_program
-            self._model[model_dict["name"]][2] = scope
-            self._model[model_dict["name"]][3] = model
-            self._model[model_dict["name"]][4] = train_program.clone()
-
-        for dataset in self._env["dataset"]:
-            if dataset["type"] != "DataLoader":
-                self._dataset[dataset["name"]] = self._create_dataset(dataset[
-                    "name"])
-
-        context['status'] = 'startup_pass'
-
-    def startup(self, context):
-        for model_dict in self._env["phase"]:
-            with fluid.scope_guard(self._model[model_dict["name"]][2]):
-                self._exe.run(self._model[model_dict["name"]][1])
-        context['status'] = 'train_pass'
-
-    def executor_train(self, context):
-        epochs = int(
-            envs.get_global_env("runner." + self._runner_name + ".epochs"))
-        for j in range(epochs):
-            for model_dict in self._env["phase"]:
-                if j == 0:
-                    with fluid.scope_guard(self._model[model_dict["name"]][2]):
-                        train_prog = self._model[model_dict["name"]][0]
-                        startup_prog = self._model[model_dict["name"]][1]
-                        with fluid.program_guard(train_prog, startup_prog):
-                            self.load()
-                reader_name = model_dict["dataset_name"]
-                name = "dataset." + reader_name + "."
-                begin_time = time.time()
-                if envs.get_global_env(name + "type") == "DataLoader":
-                    self._executor_dataloader_train(model_dict)
-                else:
-                    self._executor_dataset_train(model_dict)
-                with fluid.scope_guard(self._model[model_dict["name"]][2]):
-                    train_prog = self._model[model_dict["name"]][4]
-                    startup_prog = self._model[model_dict["name"]][1]
-                    with fluid.program_guard(train_prog, startup_prog):
-                        self.save(j)
-                end_time = time.time()
-                seconds = end_time - begin_time
-            print("epoch {} done, time elasped: {}".format(j, seconds))
-        context['status'] = "terminal_pass"
-
-    def _executor_dataset_train(self, model_dict):
-        reader_name = model_dict["dataset_name"]
-        model_name = model_dict["name"]
-        model_class = self._model[model_name][3]
-        fetch_vars = []
-        fetch_alias = []
-        fetch_period = int(
-            envs.get_global_env("runner." + self._runner_name +
-                                ".print_interval", 20))
-        metrics = model_class.get_metrics()
-        if metrics:
-            fetch_vars = metrics.values()
-            fetch_alias = metrics.keys()
-        scope = self._model[model_name][2]
-        program = self._model[model_name][0]
-        reader = self._dataset[reader_name]
-        threads = model_dict.get("thread_num", 1)
-        with fluid.scope_guard(scope):
-            self._exe.train_from_dataset(
-                program=program,
-                dataset=reader,
-                thread=threads,
-                fetch_list=fetch_vars,
-                fetch_info=fetch_alias,
-                print_period=fetch_period)
-
-    def _executor_dataloader_train(self, model_dict):
-        reader_name = model_dict["dataset_name"]
-        model_name = model_dict["name"]
-        model_class = self._model[model_name][3]
-        program = self._model[model_name][0].clone()
-
-        _build_strategy = fluid.BuildStrategy()
-        _exe_strategy = fluid.ExecutionStrategy()
-
-        # 0: kCoeffNumDevice; 1: One; 2: Customized
-        _gradient_scale_strategy = model_dict.get("gradient_scale_strategy", 0)
-        if _gradient_scale_strategy == 0:
-            gradient_scale_strategy = fluid.BuildStrategy.GradientScaleStrategy.CoeffNumDevice
-        elif _gradient_scale_strategy == 1:
-            gradient_scale_strategy = fluid.BuildStrategy.GradientScaleStrategy.One
-        elif _gradient_scale_strategy == 2:
-            gradient_scale_strategy = fluid.BuildStrategy.GradientScaleStrategy.Customized
-        else:
-            raise ValueError(
-                "Unsurpported config. gradient_scale_strategy must be one of [0, 1, 2]."
-            )
-        _build_strategy.gradient_scale_strategy = gradient_scale_strategy
-
-        if "thread_num" in model_dict and model_dict["thread_num"] > 1:
-            _build_strategy.reduce_strategy = fluid.BuildStrategy.ReduceStrategy.Reduce
-            _exe_strategy.num_threads = model_dict["thread_num"]
-            os.environ['CPU_NUM'] = str(_exe_strategy.num_threads)
-
-        program = fluid.compiler.CompiledProgram(program).with_data_parallel(
-            loss_name=model_class.get_avg_cost().name,
-            build_strategy=_build_strategy,
-            exec_strategy=_exe_strategy)
-
-        fetch_vars = []
-        fetch_alias = []
-        fetch_period = int(
-            envs.get_global_env("runner." + self._runner_name +
-                                ".print_interval", 20))
-        metrics = model_class.get_metrics()
-        if metrics:
-            fetch_vars = metrics.values()
-            fetch_alias = metrics.keys()
-        metrics_varnames = []
-        metrics_format = []
-        metrics_format.append("{}: {{}}".format("batch"))
-        for name, var in metrics.items():
-            metrics_varnames.append(var.name)
-            metrics_format.append("{}: {{}}".format(name))
-        metrics_format = ", ".join(metrics_format)
-
-        reader = self._model[model_name][3]._data_loader
-        reader.start()
-        batch_id = 0
-        scope = self._model[model_name][2]
-        with fluid.scope_guard(scope):
-            try:
-                while True:
-                    metrics_rets = self._exe.run(program=program,
-                                                 fetch_list=metrics_varnames)
-                    metrics = [batch_id]
-                    metrics.extend(metrics_rets)
-
-                    if batch_id % fetch_period == 0 and batch_id != 0:
-                        print(metrics_format.format(*metrics))
-                    batch_id += 1
-            except fluid.core.EOFException:
-                reader.reset()
-
-    def terminal(self, context):
-        context['is_exit'] = True
-
-    def load(self, is_fleet=False):
-        dirname = envs.get_global_env(
-            "runner." + self._runner_name + ".init_model_path", None)
-        load_vars = envs.get_global_env(
-            "runner." + self._runner_name + ".load_vars", None)
-
-        def name_has_embedding(var):
-            res = False
-            for var_name in load_vars:
-                if var_name == var.name:
-                    return True
-            return res
-
-        if dirname is None or dirname == "":
-            return
-        print("going to load ", dirname)
-        if is_fleet:
-            fleet.load_persistables(self._exe, dirname)
-        else:
-            if load_vars is None or len(load_vars) == 0:
-                fluid.io.load_persistables(self._exe, dirname)
-            else:
-                fluid.io.load_vars(
-                    self._exe, dirname, predicate=name_has_embedding)
-
-    def save(self, epoch_id, is_fleet=False):
-        def need_save(epoch_id, epoch_interval, is_last=False):
-            if is_last:
-                return True
-            if epoch_id == -1:
-                return False
-
-            return epoch_id % epoch_interval == 0
-
-        def save_inference_model():
-            name = "runner." + self._runner_name + "."
-            save_interval = int(
-                envs.get_global_env(name + "save_inference_interval", -1))
-            if not need_save(epoch_id, save_interval, False):
-                return
-            feed_varnames = envs.get_global_env(
-                name + "save_inference_feed_varnames", [])
-            fetch_varnames = envs.get_global_env(
-                name + "save_inference_fetch_varnames", [])
-            if feed_varnames is None or fetch_varnames is None or feed_varnames == "" or fetch_varnames == "" or \
-               len(feed_varnames) == 0 or len(fetch_varnames) == 0:
-                return
-            fetch_vars = [
-                fluid.default_main_program().global_block().vars[varname]
-                for varname in fetch_varnames
-            ]
-            dirname = envs.get_global_env(name + "save_inference_path", None)
-
-            assert dirname is not None
-            dirname = os.path.join(dirname, str(epoch_id))
-
-            if is_fleet:
-                fleet.save_inference_model(self._exe, dirname, feed_varnames,
-                                           fetch_vars)
-            else:
-                fluid.io.save_inference_model(dirname, feed_varnames,
-                                              fetch_vars, self._exe)
-
-        def save_persistables():
-            name = "runner." + self._runner_name + "."
-            save_interval = int(
-                envs.get_global_env(name + "save_checkpoint_interval", -1))
-            if not need_save(epoch_id, save_interval, False):
-                return
-            dirname = envs.get_global_env(name + "save_checkpoint_path", None)
-            if dirname is None or dirname == "":
-                return
-            dirname = os.path.join(dirname, str(epoch_id))
-            if is_fleet:
-                fleet.save_persistables(self._exe, dirname)
-            else:
-                fluid.io.save_persistables(self._exe, dirname)
-
-        save_persistables()
-        save_inference_model()
diff --git a/doc/custom_reader.md b/doc/custom_reader.md
index bf0e5433b06c90dab7440b7dbf19eaa6ef975d1c..748f82c5499721857a011b08076af1b732914cc0 100644
--- a/doc/custom_reader.md
+++ b/doc/custom_reader.md
@@ -208,7 +208,7 @@ CTR-DNN训练及测试数据集选用[Display Advertising Challenge](https://www
 稀疏参数输入的定义:
 ```python
 def sparse_inputs():
-    ids = envs.get_global_env("hyper_parameters.sparse_inputs_slots", None, self._namespace)
+    ids = envs.get_global_env("hyper_parameters.sparse_inputs_slots", None)
 
     sparse_input_ids = [
         fluid.layers.data(name="S" + str(i),
@@ -222,7 +222,7 @@ def sparse_inputs():
 稠密参数输入的定义：
 ```python
 def dense_input():
-    dim = envs.get_global_env("hyper_parameters.dense_input_dim", None, self._namespace)
+    dim = envs.get_global_env("hyper_parameters.dense_input_dim", None)
 
     dense_input_var = fluid.layers.data(name="D",
                                         shape=[dim],
diff --git a/doc/design.md b/doc/design.md
index f88401aafc74a1b9910bdb082fa7a6cefa301359..164fa811b1ae800c0d8b84e8fdebfc7f59ab5430 100644
--- a/doc/design.md
+++ b/doc/design.md
@@ -139,7 +139,6 @@ class Model(object):
         self._data_loader = None
         self._infer_data_loader = None
         self._fetch_interval = 20
-        self._namespace = "train.model"
         self._platform = envs.get_platform()
 
     def get_inputs(self):
diff --git a/doc/model.md b/doc/model.md
index ca76dd360c9c9740b1d607e78682c80aded4898e..d4c09733bc2489bafb811d74489f6e6556788e9e 100644
--- a/doc/model.md
+++ b/doc/model.md
@@ -24,8 +24,7 @@ hyper_parameters:
 
 ```python
 if name == "SGD":
-    reg = envs.get_global_env("hyper_parameters.reg", 0.0001,
-                                self._namespace)
+    reg = envs.get_global_env("hyper_parameters.reg", 0.0001)
     optimizer_i = fluid.optimizer.SGD(
         lr, regularization=fluid.regularizer.L2DecayRegularizer(reg))
 elif name == "ADAM":
diff --git a/models/treebased/tdm/tdm_startup.py b/models/treebased/tdm/tdm_startup.py
index 3f1b87dbedd7a2448a77c9388f6e348dcf210245..ccc9b6c96372321a04730f7d08f9c92d9504313a 100644
--- a/models/treebased/tdm/tdm_startup.py
+++ b/models/treebased/tdm/tdm_startup.py
@@ -47,7 +47,7 @@ class Startup(StartupBase):
     def _single_startup(self, context):
         load_tree_from_numpy = envs.get_global_env(
             "hyper_parameters.tree.load_tree_from_numpy", False)
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         with fluid.scope_guard(context["model"][model_dict["name"]]["scope"]):
             context["exe"].run(context["model"][model_dict["name"]][
                 "startup_program"])
@@ -106,7 +106,7 @@ class Startup(StartupBase):
         warmup_model_path = envs.get_global_env(
             "runner." + context["runner_name"] + ".init_model_path", None)
         assert warmup_model_path != None, "set runner.init_model_path for loading model"
-        model_dict = context["env"]["phase"][0]
+        model_dict = envs.get_global_env("phase")[0]
         with fluid.scope_guard(context["model"][model_dict["name"]]["scope"]):
             context["exe"].run(context["model"][model_dict["name"]][
                 "startup_program"])