diff --git a/mindspore/lite/examples/export_models/models/densenet_train_export.py b/mindspore/lite/examples/export_models/models/densenet_train_export.py
index dd46e32a7a..3aa0649fa3 100644
--- a/mindspore/lite/examples/export_models/models/densenet_train_export.py
+++ b/mindspore/lite/examples/export_models/models/densenet_train_export.py
@@ -17,14 +17,13 @@
 import sys
 import os
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
 from mindspore.train.serialization import export
-
-sys.path.append(os.environ['CLOUD_MODEL_ZOO'] + 'official/cv/densenet/')
-#pylint: disable=wrong-import-position
 from src.network.densenet import DenseNet121
+sys.path.append(os.environ['CLOUD_MODEL_ZOO'] + 'official/cv/densenet121/')
+#pylint: disable=wrong-import-position
 
 
 context.set_context(mode=context.PYNATIVE_MODE, device_target="GPU", save_graphs=False)
@@ -33,7 +32,7 @@ n = DenseNet121(num_classes=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.SGD(n.trainable_params(), learning_rate=0.001, momentum=0.9, dampening=0.0, weight_decay=0.0,
                    nesterov=True, loss_scale=0.9)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
@@ -41,4 +40,4 @@ label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/densenet_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "densenet", x, label, n, net)
+    save_inout(sys.argv[1] + "densenet", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/effnet.py b/mindspore/lite/examples/export_models/models/effnet.py
index 497175731b..fc498724f6 100755
--- a/mindspore/lite/examples/export_models/models/effnet.py
+++ b/mindspore/lite/examples/export_models/models/effnet.py
@@ -20,6 +20,7 @@ from mindspore.ops import operations as P
 from mindspore.common.initializer import TruncatedNormal
 from mindspore import Tensor
 
+
 def weight_variable():
     """weight initial"""
     return TruncatedNormal(0.02)
@@ -40,6 +41,7 @@ def _make_value_divisible(value, factor, min_value=None):
         new_value += factor
     return new_value
 
+
 class Swish(nn.Cell):
     def __init__(self):
         super().__init__()
@@ -58,7 +60,8 @@ class AdaptiveAvgPool(nn.Cell):
         self.output_size = output_size
 
     def construct(self, x):
-        return self.mean(x, (2, 3)) ## This is not a general case
+        return self.mean(x, (2, 3)) # This is not a general case
+
 
 class SELayer(nn.Cell):
     """SELayer"""
@@ -74,24 +77,27 @@ class SELayer(nn.Cell):
         self.act2 = nn.Sigmoid()
 
     def construct(self, x):
-        o = self.avg_pool(x) #.view(b,c)
+        o = self.avg_pool(x) # .view(b,c)
         o = self.conv_reduce(o)
         o = self.act1(o)
         o = self.conv_expand(o)
-        o = self.act2(o) #.view(b, c, 1,1)
+        o = self.act2(o) # .view(b, c, 1,1)
         return x * o
 
+
 class DepthwiseSeparableConv(nn.Cell):
     """DepthwiseSeparableConv"""
     def __init__(self, in_chs, out_chs, dw_kernel_size=3, stride=1, noskip=False, se_ratio=0.0, drop_connect_rate=0.0):
         super().__init__()
-        assert stride in [1, 2]
+        if stride not in [1, 2]:
+            print("ERROR stride param")
+            return
         self.has_residual = (stride == 1 and in_chs == out_chs) and not noskip
         self.drop_connect_rate = drop_connect_rate
 
         self.conv_dw = nn.Conv2d(in_channels=in_chs, out_channels=in_chs, kernel_size=dw_kernel_size, stride=stride,
                                  pad_mode="pad", padding=1, has_bias=False, group=in_chs)
-        self.bn1 = nn.BatchNorm2d(in_chs, eps=0.001) #,momentum=0.1)
+        self.bn1 = nn.BatchNorm2d(in_chs, eps=0.001) # momentum=0.1)
         self.act1 = Swish()
 
        # Squeeze-and-excitation
@@ -101,7 +107,7 @@ class DepthwiseSeparableConv(nn.Cell):
             print("ERRRRRORRRR -- not prepared for this one\n")
 
         self.conv_pw = nn.Conv2d(in_channels=in_chs, out_channels=out_chs, kernel_size=1, stride=stride, has_bias=False)
-        self.bn2 = nn.BatchNorm2d(out_chs, eps=0.001) #,momentum=0.1)
+        self.bn2 = nn.BatchNorm2d(out_chs, eps=0.001) # momentum=0.1)
 
     def construct(self, x):
         """construct"""
@@ -120,12 +126,13 @@ class DepthwiseSeparableConv(nn.Cell):
             x += residual
         return x
 
+
 def conv_3x3_bn(inp, oup, stride):
     weight = weight_variable()
     return nn.SequentialCell([
         nn.Conv2d(in_channels=inp, out_channels=oup, kernel_size=3, stride=stride, padding=1, weight_init=weight,
                   has_bias=False, pad_mode='pad'),
-        nn.BatchNorm2d(oup, eps=0.001),  #, momentum=0.1),
+        nn.BatchNorm2d(oup, eps=0.001),  # momentum=0.1),
         nn.HSwish()])
 
 
@@ -142,7 +149,9 @@ class InvertedResidual(nn.Cell):
     """InvertedResidual"""
     def __init__(self, in_chs, out_chs, kernel_size, stride, padding, expansion, se_ratio):
         super().__init__()
-        assert stride in [1, 2]
+        if stride not in [1, 2]:
+            print("ERROR stride param")
+            return
         mid_chs: int = _make_value_divisible(in_chs * expansion, 1)
         self.has_residual = (in_chs == out_chs and stride == 1)
         self.drop_connect_rate = 0
@@ -210,7 +219,7 @@ class EfficientNet(nn.Cell):
 
         self.conv_stem = nn.Conv2d(in_channels=3, out_channels=stem_size, kernel_size=3, stride=2, has_bias=False)
 
-        self.bn1 = nn.BatchNorm2d(stem_size, eps=0.001) #momentum=0.1)
+        self.bn1 = nn.BatchNorm2d(stem_size, eps=0.001) # momentum=0.1)
         self.act1 = Swish()
         in_chs = stem_size
 
@@ -240,7 +249,7 @@ class EfficientNet(nn.Cell):
         self.blocks = nn.SequentialCell(layers)
 
         self.conv_head = nn.Conv2d(in_channels=320, out_channels=self.num_features_, kernel_size=1)
-        self.bn2 = nn.BatchNorm2d(self.num_features_, eps=0.001) #,momentum=0.1)
+        self.bn2 = nn.BatchNorm2d(self.num_features_, eps=0.001) # momentum=0.1)
         self.act2 = Swish()
         self.global_pool = AdaptiveAvgPool(output_size=(1, 1))
         self.classifier = nn.Dense(self.num_features_, num_classes)
diff --git a/mindspore/lite/examples/export_models/models/effnet_train_export.py b/mindspore/lite/examples/export_models/models/effnet_train_export.py
index bf341f205a..3384cc28d9 100644
--- a/mindspore/lite/examples/export_models/models/effnet_train_export.py
+++ b/mindspore/lite/examples/export_models/models/effnet_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from effnet import effnet
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,11 +28,11 @@ n = effnet(num_classes=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.SGD(n.trainable_params(), learning_rate=0.01, momentum=0.9, dampening=0.0, weight_decay=0.0,
                    nesterov=True, loss_scale=1.0)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 x = Tensor(np.random.randn(2, 3, 224, 224), mstype.float32)
 label = Tensor(np.zeros([2, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/effnet_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "effnet", x, label, n, net)
+    save_inout(sys.argv[1] + "effnet", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/effnet_tune_train_export.py b/mindspore/lite/examples/export_models/models/effnet_tune_train_export.py
index 2b21ee82df..3e61b441a6 100644
--- a/mindspore/lite/examples/export_models/models/effnet_tune_train_export.py
+++ b/mindspore/lite/examples/export_models/models/effnet_tune_train_export.py
@@ -17,7 +17,7 @@
 import sys
 from os import path
 import numpy as np
-from train_utils import TrainWrap, SaveT
+from train_utils import train_wrap, save_t
 from effnet import effnet
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -26,11 +26,13 @@ from mindspore.common.parameter import ParameterTuple
 
 context.set_context(mode=context.PYNATIVE_MODE, device_target="GPU", save_graphs=False)
 
+
 class TransferNet(nn.Cell):
     def __init__(self, backbone, head):
         super().__init__(TransferNet)
         self.backbone = backbone
         self.head = head
+
     def construct(self, x):
         x = self.backbone(x)
         x = self.head(x)
@@ -56,7 +58,7 @@ trainable_weights_list.extend(n.head.trainable_params())
 trainable_weights = ParameterTuple(trainable_weights_list)
 sgd = nn.SGD(trainable_weights, learning_rate=0.01, momentum=0.9,
              dampening=0.01, weight_decay=0.0, nesterov=False, loss_scale=1.0)
-net = TrainWrap(n, optimizer=sgd, weights=trainable_weights)
+net = train_wrap(n, optimizer=sgd, weights=trainable_weights)
 
 BATCH_SIZE = 8
 X = Tensor(np.random.randn(BATCH_SIZE, 3, 224, 224), mstype.float32)
@@ -66,10 +68,10 @@ export(net, X, label, file_name="mindir/effnet_tune_train", file_format='MINDIR'
 if len(sys.argv) > 1:
     name_prefix = sys.argv[1] + "effnet_tune"
     x_name = name_prefix + "_input1.bin"
-    SaveT(Tensor(X.asnumpy().transpose(0, 2, 3, 1)), x_name)
+    save_t(Tensor(X.asnumpy().transpose(0, 2, 3, 1)), x_name)
 
     l_name = name_prefix + "_input2.bin"
-    SaveT(label, l_name)
+    save_t(label, l_name)
 
     #train network
     n.head.set_train(True)
@@ -80,4 +82,4 @@ if len(sys.argv) > 1:
     n.set_train(False)
     y = n(X)
     y_name = name_prefix + "_output1.bin"
-    SaveT(y, y_name)
+    save_t(y, y_name)
diff --git a/mindspore/lite/examples/export_models/models/googlenet_train_export.py b/mindspore/lite/examples/export_models/models/googlenet_train_export.py
index c2ddcc21e2..91a0062053 100644
--- a/mindspore/lite/examples/export_models/models/googlenet_train_export.py
+++ b/mindspore/lite/examples/export_models/models/googlenet_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.googlenet.src.googlenet import GoogleNet
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,7 +28,7 @@ n = GoogleNet(num_classes=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.SGD(n.trainable_params(), learning_rate=0.01, momentum=0.9, dampening=0.0, weight_decay=5e-4,
                    nesterov=True, loss_scale=0.9)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
@@ -36,4 +36,4 @@ label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/googlenet_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "googlenet", x, label, n, net)
+    save_inout(sys.argv[1] + "googlenet", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/lenet_train_export.py b/mindspore/lite/examples/export_models/models/lenet_train_export.py
index 1b7dfda449..4e03aabd54 100644
--- a/mindspore/lite/examples/export_models/models/lenet_train_export.py
+++ b/mindspore/lite/examples/export_models/models/lenet_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.lenet.src.lenet import LeNet5
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,11 +28,11 @@ n = LeNet5()
 loss_fn = nn.MSELoss()
 optimizer = nn.Adam(n.trainable_params(), learning_rate=1e-2, beta1=0.5, beta2=0.7, eps=1e-2, use_locking=True,
                     use_nesterov=False, weight_decay=0.0, loss_scale=0.3)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 x = Tensor(np.random.randn(32, 1, 32, 32), mstype.float32)
 label = Tensor(np.zeros([32, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/lenet_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "lenet", x, label, n, net, sparse=False)
+    save_inout(sys.argv[1] + "lenet", x, label, n, net, sparse=False)
diff --git a/mindspore/lite/examples/export_models/models/mini_alexnet.py b/mindspore/lite/examples/export_models/models/mini_alexnet.py
index 9a8b828a81..e6008fa714 100644
--- a/mindspore/lite/examples/export_models/models/mini_alexnet.py
+++ b/mindspore/lite/examples/export_models/models/mini_alexnet.py
@@ -17,13 +17,16 @@
 import mindspore.nn as nn
 from mindspore.ops import operations as P
 
+
 def conv(in_channels, out_channels, kernel_size, stride=1, padding=0, pad_mode="valid", has_bias=True):
     return nn.Conv2d(in_channels, out_channels, kernel_size=kernel_size, stride=stride, padding=padding,
                      has_bias=has_bias, pad_mode=pad_mode)
 
+
 def fc_with_initialize(input_channels, out_channels, has_bias=True):
     return nn.Dense(input_channels, out_channels, has_bias=has_bias)
 
+
 class AlexNet(nn.Cell):
     """
     Alexnet
diff --git a/mindspore/lite/examples/export_models/models/mini_alexnet_train_export.py b/mindspore/lite/examples/export_models/models/mini_alexnet_train_export.py
index 544daad6cf..1b9a82d8af 100644
--- a/mindspore/lite/examples/export_models/models/mini_alexnet_train_export.py
+++ b/mindspore/lite/examples/export_models/models/mini_alexnet_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from mini_alexnet import AlexNet
 from mindspore import context, Tensor, nn
 from mindspore.train.serialization import export
@@ -31,11 +31,11 @@ n = AlexNet(phase='test')
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.Adam(n.trainable_params(), learning_rate=1e-3, beta1=0.9, beta2=0.999, eps=1e-8, use_locking=False,
                     use_nesterov=False, weight_decay=0.0, loss_scale=1.0)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 x = Tensor(np.ones([batch, 1, 32, 32]).astype(np.float32) * 0.01)
 label = Tensor(np.zeros([batch, number_of_classes]).astype(np.float32))
 export(net, x, label, file_name="mindir/mini_alexnet_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "mini_alexnet", x, label, n, net, sparse=False)
+    save_inout(sys.argv[1] + "mini_alexnet", x, label, n, net, sparse=False)
diff --git a/mindspore/lite/examples/export_models/models/mobilenetv1_train_export.py b/mindspore/lite/examples/export_models/models/mobilenetv1_train_export.py
index f668a96714..b3b26de954 100644
--- a/mindspore/lite/examples/export_models/models/mobilenetv1_train_export.py
+++ b/mindspore/lite/examples/export_models/models/mobilenetv1_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.mobilenetv1.src.mobilenet_v1 import MobileNetV1
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,7 +28,7 @@ n = MobileNetV1(10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.SGD(n.trainable_params(), learning_rate=1e-2, momentum=0.9, dampening=0.1, weight_decay=0.0,
                    nesterov=False, loss_scale=1.0)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
@@ -37,4 +37,4 @@ label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/mobilenetv1_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "mobilenetv1", x, label, n, net)
+    save_inout(sys.argv[1] + "mobilenetv1", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/mobilenetv2_train_export.py b/mindspore/lite/examples/export_models/models/mobilenetv2_train_export.py
index 8f1d5432ac..0433063999 100644
--- a/mindspore/lite/examples/export_models/models/mobilenetv2_train_export.py
+++ b/mindspore/lite/examples/export_models/models/mobilenetv2_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.mobilenetv2.src.mobilenetV2 import MobileNetV2Backbone, MobileNetV2Head, mobilenet_v2
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -31,11 +31,11 @@ n = mobilenet_v2(backbone_net, head_net)
 
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.Momentum(n.trainable_params(), 0.01, 0.9, use_nesterov=False)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
 label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/mobilenetv2_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "mobilenetv2", x, label, n, net, sparse=False)
+    save_inout(sys.argv[1] + "mobilenetv2", x, label, n, net, sparse=False)
diff --git a/mindspore/lite/examples/export_models/models/mobilenetv3_train_export.py b/mindspore/lite/examples/export_models/models/mobilenetv3_train_export.py
index 26a667135a..1f752528ad 100644
--- a/mindspore/lite/examples/export_models/models/mobilenetv3_train_export.py
+++ b/mindspore/lite/examples/export_models/models/mobilenetv3_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.mobilenetv3.src.mobilenetV3 import mobilenet_v3_small
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,7 +28,7 @@ n = mobilenet_v3_small(num_classes=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False, reduction='mean')
 optimizer = nn.Adam(n.trainable_params(), learning_rate=1e-3, beta1=0.5, beta2=0.7, eps=1e-2, use_locking=True,
                     use_nesterov=False, weight_decay=0.1, loss_scale=0.3)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
@@ -36,4 +36,4 @@ label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/mobilenetv3_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "mobilenetv3", x, label, n, net, sparse=False)
+    save_inout(sys.argv[1] + "mobilenetv3", x, label, n, net, sparse=False)
diff --git a/mindspore/lite/examples/export_models/models/nin_train_export.py b/mindspore/lite/examples/export_models/models/nin_train_export.py
index 72ccc5e605..786f73919b 100644
--- a/mindspore/lite/examples/export_models/models/nin_train_export.py
+++ b/mindspore/lite/examples/export_models/models/nin_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from NetworkInNetwork import NiN
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,7 +28,7 @@ n = NiN(num_classes=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=True, reduction="mean")
 optimizer = nn.SGD(n.trainable_params(), learning_rate=0.01, momentum=0.9, dampening=0.0, weight_decay=5e-4,
                    nesterov=True, loss_scale=0.9)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 32, 32), mstype.float32)
@@ -36,4 +36,4 @@ label = Tensor(np.zeros([batch]).astype(np.int32))
 export(net, x, label, file_name="mindir/nin_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "nin", x, label, n, net)
+    save_inout(sys.argv[1] + "nin", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/resnet_train_export.py b/mindspore/lite/examples/export_models/models/resnet_train_export.py
index c0dbe90555..c18bcf36c0 100644
--- a/mindspore/lite/examples/export_models/models/resnet_train_export.py
+++ b/mindspore/lite/examples/export_models/models/resnet_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.resnet.src.resnet import resnet50
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -29,11 +29,11 @@ n = resnet50(class_num=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.SGD(n.trainable_params(), learning_rate=0.01, momentum=0.9, dampening=0.0, weight_decay=0.0,
                    nesterov=True, loss_scale=1.0)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
 label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/resnet_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "resnet", x, label, n, net)
+    save_inout(sys.argv[1] + "resnet", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/shufflenetv2_train_export.py b/mindspore/lite/examples/export_models/models/shufflenetv2_train_export.py
index 97aa4ec354..bf76d48268 100644
--- a/mindspore/lite/examples/export_models/models/shufflenetv2_train_export.py
+++ b/mindspore/lite/examples/export_models/models/shufflenetv2_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.shufflenetv2.src.shufflenetv2 import ShuffleNetV2
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -28,7 +28,7 @@ n = ShuffleNetV2(n_class=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.Momentum(n.trainable_params(), 0.01, 0.9, use_nesterov=False)
 
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
@@ -36,4 +36,4 @@ label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/shufflenetv2_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "shufflenetv2", x, label, n, net)
+    save_inout(sys.argv[1] + "shufflenetv2", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/train_utils.py b/mindspore/lite/examples/export_models/models/train_utils.py
index e32fda16a1..5017b8f98e 100644
--- a/mindspore/lite/examples/export_models/models/train_utils.py
+++ b/mindspore/lite/examples/export_models/models/train_utils.py
@@ -14,11 +14,13 @@
 # ============================================================================
 """train_utils."""
 
+import os
 from mindspore import nn, Tensor
 from mindspore.common.parameter import ParameterTuple
 
-def TrainWrap(net, loss_fn=None, optimizer=None, weights=None):
-    """TrainWrap"""
+
+def train_wrap(net, loss_fn=None, optimizer=None, weights=None):
+    """train_wrap"""
     if loss_fn is None:
         loss_fn = nn.SoftmaxCrossEntropyWithLogits()
     loss_net = nn.WithLossCell(net, loss_fn)
@@ -32,22 +34,22 @@ def TrainWrap(net, loss_fn=None, optimizer=None, weights=None):
     return train_net
 
 
-def SaveT(t, file):
+def save_t(t, file):
     x = t.asnumpy()
     x.tofile(file)
 
 
-def SaveInOut(name, x, l, net, net_train, sparse=False, epoch=1):
-    """SaveInOut"""
+def save_inout(name, x, l, net, net_train, sparse=False, epoch=1):
+    """save_inout"""
     x_name = name + "_input1.bin"
     if sparse:
         x_name = name + "_input2.bin"
-    SaveT(Tensor(x.asnumpy().transpose(0, 2, 3, 1)), x_name)
+    save_t(Tensor(x.asnumpy().transpose(0, 2, 3, 1)), x_name)
 
     l_name = name + "_input2.bin"
     if sparse:
         l_name = name + "_input1.bin"
-    SaveT(l, l_name)
+    save_t(l, l_name)
 
     net.set_train(False)
     y = net(x)
@@ -62,10 +64,10 @@ def SaveInOut(name, x, l, net, net_train, sparse=False, epoch=1):
     if isinstance(y, tuple):
         i = 1
         for t in y:
-            with open(name + "_output" + str(i) + ".bin", 'w') as f:
+            with os.fdopen(name + "_output" + str(i) + ".bin", 'w') as f:
                 for j in t.asnumpy().flatten():
                     f.write(str(j)+' ')
             i = i + 1
     else:
         y_name = name + "_output1.bin"
-        SaveT(y, y_name)
+        save_t(y, y_name)
diff --git a/mindspore/lite/examples/export_models/models/vgg_train_export.py b/mindspore/lite/examples/export_models/models/vgg_train_export.py
index 007825283a..c18b33c63e 100644
--- a/mindspore/lite/examples/export_models/models/vgg_train_export.py
+++ b/mindspore/lite/examples/export_models/models/vgg_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.vgg16.src.vgg import vgg16
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -29,11 +29,11 @@ batch = 2
 n = vgg16(num_classes=10)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.Momentum(n.trainable_params(), 0.01, 0.9, use_nesterov=False)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 x = Tensor(np.random.randn(batch, 3, 224, 224), mstype.float32)
 label = Tensor(np.zeros([batch, 10]).astype(np.float32))
 export(net, x, label, file_name="mindir/vgg_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "vgg", x, label, n, net)
+    save_inout(sys.argv[1] + "vgg", x, label, n, net)
diff --git a/mindspore/lite/examples/export_models/models/xception_train_export.py b/mindspore/lite/examples/export_models/models/xception_train_export.py
index 6b82b3bb05..e544d7ee25 100644
--- a/mindspore/lite/examples/export_models/models/xception_train_export.py
+++ b/mindspore/lite/examples/export_models/models/xception_train_export.py
@@ -16,7 +16,7 @@
 
 import sys
 import numpy as np
-from train_utils import SaveInOut, TrainWrap
+from train_utils import save_inout, train_wrap
 from official.cv.xception.src.Xception import Xception
 import mindspore.common.dtype as mstype
 from mindspore import context, Tensor, nn
@@ -31,7 +31,7 @@ n.dropout = nn.Dropout(keep_prob=1.0)
 loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=False)
 optimizer = nn.SGD(n.trainable_params(), learning_rate=0.01, momentum=0.9, dampening=0.0, weight_decay=0.0,
                    nesterov=True, loss_scale=1.0)
-net = TrainWrap(n, loss_fn, optimizer)
+net = train_wrap(n, loss_fn, optimizer)
 
 batch = 2
 x = Tensor(np.random.randn(batch, 3, 299, 299), mstype.float32)
@@ -39,4 +39,4 @@ label = Tensor(np.zeros([batch, 1000]).astype(np.float32))
 export(net, x, label, file_name="mindir/xception_train", file_format='MINDIR')
 
 if len(sys.argv) > 1:
-    SaveInOut(sys.argv[1] + "xception", x, label, n, net)
+    save_inout(sys.argv[1] + "xception", x, label, n, net)
diff --git a/mindspore/lite/examples/train_lenet/model/lenet_export.py b/mindspore/lite/examples/train_lenet/model/lenet_export.py
index 8a9cd7c53f..c774887e83 100644
--- a/mindspore/lite/examples/train_lenet/model/lenet_export.py
+++ b/mindspore/lite/examples/train_lenet/model/lenet_export.py
@@ -19,7 +19,7 @@ from mindspore import context, Tensor
 import mindspore.common.dtype as mstype
 from mindspore.train.serialization import export
 from lenet import LeNet5
-from train_utils import TrainWrap
+from train_utils import train_wrap
 
 n = LeNet5()
 n.set_train()
@@ -28,7 +28,7 @@ context.set_context(mode=context.PYNATIVE_MODE, device_target="CPU", save_graphs
 BATCH_SIZE = 32
 x = Tensor(np.ones((BATCH_SIZE, 1, 32, 32)), mstype.float32)
 label = Tensor(np.zeros([BATCH_SIZE]).astype(np.int32))
-net = TrainWrap(n)
+net = train_wrap(n)
 export(net, x, label, file_name="lenet_tod", file_format='MINDIR')
 
 print("finished exporting")
diff --git a/mindspore/lite/examples/train_lenet/model/train_utils.py b/mindspore/lite/examples/train_lenet/model/train_utils.py
index 9e8e3fa315..9e3ad76db1 100644
--- a/mindspore/lite/examples/train_lenet/model/train_utils.py
+++ b/mindspore/lite/examples/train_lenet/model/train_utils.py
@@ -17,9 +17,10 @@
 import mindspore.nn as nn
 from mindspore.common.parameter import ParameterTuple
 
-def TrainWrap(net, loss_fn=None, optimizer=None, weights=None):
+
+def train_wrap(net, loss_fn=None, optimizer=None, weights=None):
     """
-    TrainWrap
+    train_wrap
     """
     if loss_fn is None:
         loss_fn = nn.SoftmaxCrossEntropyWithLogits(reduction='mean', sparse=True)
diff --git a/mindspore/lite/examples/train_lenet/src/net_runner.cc b/mindspore/lite/examples/train_lenet/src/net_runner.cc
index 1de4f7254b..4045bdbf17 100644
--- a/mindspore/lite/examples/train_lenet/src/net_runner.cc
+++ b/mindspore/lite/examples/train_lenet/src/net_runner.cc
@@ -44,10 +44,20 @@ using mindspore::lite::Model;
 using mindspore::session::TrainLoopCallBack;
 using mindspore::session::TrainLoopCallBackData;
 
+constexpr int kPrintNum = 10;
+constexpr float kScalePoint = 255.0f;
+constexpr int kBatchSize = 2;
+constexpr int kNCHWDims = 4;
+constexpr int kNCHWCDim = 2;
+constexpr int kPrintTimes = 100;
+constexpr int kSaveSteps = 1000;
+constexpr float kLearningRate = 0.7f;
 class Rescaler : public mindspore::session::TrainLoopCallBack {
  public:
   explicit Rescaler(float scale) : scale_(scale) {
-    if (scale_ == 0) scale_ = 1.0;
+    if (scale_ == 0) {
+      scale_ = 1.0;
+    }
   }
   ~Rescaler() override = default;
   void StepBegin(const mindspore::session::TrainLoopCallBackData &cb_data) override {
@@ -68,7 +78,7 @@ bool after_callback(const std::vector<mindspore::tensor::MSTensor *> &after_inpu
   for (size_t i = 0; i < after_inputs.size(); i++) {
     int num2p = (after_inputs.at(i)->ElementsNum());
     printf("in%zu(%d): ", i, num2p);
-    if (num2p > 10) num2p = 10;
+    if (num2p > kPrintNum) num2p = kPrintNum;
     if (after_inputs.at(i)->data_type() == mindspore::kNumberTypeInt32) {
       auto d = reinterpret_cast<int *>(after_inputs.at(i)->MutableData());
       for (int j = 0; j < num2p; j++) printf("%d, ", d[j]);
@@ -101,8 +111,7 @@ void NetRunner::InitAndFigureInputs() {
   context.thread_num_ = 2;
 
   session_ = mindspore::session::LiteSession::CreateTrainSession(ms_file_, &context, true);
-
-  MS_ASSERT(nullptr != session_);
+  MS_ASSERT(session_ != nullptr);
   loop_ = mindspore::session::TrainLoop::CreateTrainLoop(session_);
 
   if (verbose_) {
@@ -115,10 +124,10 @@ void NetRunner::InitAndFigureInputs() {
   auto inputs = session_->GetInputs();
   MS_ASSERT(inputs.size() > 1);
   auto nhwc_input_dims = inputs.at(0)->shape();
-  MS_ASSERT(nhwc_input_dims.size() == 4);
+  MS_ASSERT(nhwc_input_dims.size() == kNCHWDims);
   batch_size_ = nhwc_input_dims.at(0);
   h_ = nhwc_input_dims.at(1);
-  w_ = nhwc_input_dims.at(2);
+  w_ = nhwc_input_dims.at(kNCHWCDim);
 }
 
 float NetRunner::CalculateAccuracy(int max_tests) {
@@ -131,7 +140,7 @@ float NetRunner::CalculateAccuracy(int max_tests) {
   test_ds_ = test_ds_->Map({&typecast}, {"label"});
   test_ds_ = test_ds_->Batch(batch_size_, true);
 
-  Rescaler rescale(255.0);
+  Rescaler rescale(kScalePoint);
 
   loop_->Eval(test_ds_.get(), std::vector<TrainLoopCallBack *>{&rescale});
   std::cout << "Eval Accuracy is " << acc_metrics_->Eval() << std::endl;
@@ -162,13 +171,13 @@ int NetRunner::InitDB() {
 }
 
 int NetRunner::TrainLoop() {
-  struct mindspore::lite::StepLRLambda step_lr_lambda(1, 0.7);
+  struct mindspore::lite::StepLRLambda step_lr_lambda(1, kLearningRate);
   mindspore::lite::LRScheduler step_lr_sched(mindspore::lite::StepLRLambda, static_cast<void *>(&step_lr_lambda), 1);
 
-  mindspore::lite::LossMonitor lm(100);
+  mindspore::lite::LossMonitor lm(kPrintTimes);
   mindspore::lite::ClassificationTrainAccuracyMonitor am(1);
-  mindspore::lite::CkptSaver cs(1000, std::string("lenet"));
-  Rescaler rescale(255.0);
+  mindspore::lite::CkptSaver cs(kSaveSteps, std::string("lenet"));
+  Rescaler rescale(kScalePoint);
 
   loop_->Train(epochs_, train_ds_.get(), std::vector<TrainLoopCallBack *>{&rescale, &lm, &cs, &am, &step_lr_sched});
   return 0;
diff --git a/mindspore/lite/examples/transfer_learning/model/effnet.py b/mindspore/lite/examples/transfer_learning/model/effnet.py
index 8ed066fbe7..eba29b56dd 100755
--- a/mindspore/lite/examples/transfer_learning/model/effnet.py
+++ b/mindspore/lite/examples/transfer_learning/model/effnet.py
@@ -44,6 +44,7 @@ class Swish(nn.Cell):
         m = x*s
         return m
 
+
 class AdaptiveAvgPool(nn.Cell):
     def __init__(self, output_size=None):
         super().__init__(AdaptiveAvgPool)
@@ -53,6 +54,7 @@ class AdaptiveAvgPool(nn.Cell):
     def construct(self, x):
         return self.mean(x, (2, 3))
 
+
 class SELayer(nn.Cell):
     """
     SELayer
@@ -77,6 +79,7 @@ class SELayer(nn.Cell):
         o = self.act2(o)
         return x * o
 
+
 class DepthwiseSeparableConv(nn.Cell):
     """
     DepthwiseSeparableConv
@@ -84,7 +87,9 @@ class DepthwiseSeparableConv(nn.Cell):
     def __init__(self, in_chs, out_chs, dw_kernel_size=3,
                  stride=1, noskip=False, se_ratio=0.0, drop_connect_rate=0.0):
         super().__init__(DepthwiseSeparableConv)
-        assert stride in [1, 2]
+        if stride not in [1, 2]:
+            print("ERROR")
+            return
         self.has_residual = (stride == 1 and in_chs == out_chs) and not noskip
         self.drop_connect_rate = drop_connect_rate
 
@@ -117,6 +122,7 @@ class DepthwiseSeparableConv(nn.Cell):
             x += residual
         return x
 
+
 def conv_3x3_bn(inp, oup, stride):
     weight = weight_variable()
     return nn.SequentialCell([
@@ -125,6 +131,7 @@ def conv_3x3_bn(inp, oup, stride):
         nn.BatchNorm2d(oup, eps=0.001),  # , momentum=0.1),
         nn.HSwish()])
 
+
 def conv_1x1_bn(inp, oup):
     weight = weight_variable()
     return nn.SequentialCell([
@@ -133,13 +140,16 @@ def conv_1x1_bn(inp, oup):
         nn.BatchNorm2d(oup, eps=0.001),
         nn.HSwish()])
 
+
 class InvertedResidual(nn.Cell):
     """
     InvertedResidual
     """
     def __init__(self, in_chs, out_chs, kernel_size, stride, padding, expansion, se_ratio):
         super().__init__(InvertedResidual)
-        assert stride in [1, 2]
+        if stride not in [1, 2]:
+            print("ERROR")
+            return
         mid_chs: int = _make_divisible(in_chs * expansion, 1)
         self.has_residual = (in_chs == out_chs and stride == 1)
         self.drop_connect_rate = 0
@@ -194,6 +204,7 @@ class InvertedResidual(nn.Cell):
             x += residual
         return x
 
+
 class EfficientNet(nn.Cell):
     """
     EfficientNet
@@ -295,6 +306,7 @@ class EfficientNet(nn.Cell):
             elif isinstance(m, nn.Dense):
                 init_linear_weight(m)
 
+
 def effnet(**kwargs):
     """
     Constructs a EfficientNet model
diff --git a/mindspore/lite/examples/transfer_learning/model/train_utils.py b/mindspore/lite/examples/transfer_learning/model/train_utils.py
index 550dd34cc2..53585c8524 100644
--- a/mindspore/lite/examples/transfer_learning/model/train_utils.py
+++ b/mindspore/lite/examples/transfer_learning/model/train_utils.py
@@ -17,9 +17,9 @@
 import mindspore.nn as nn
 from mindspore.common.parameter import ParameterTuple
 
-def TrainWrap(net, loss_fn=None, optimizer=None, weights=None):
+def train_wrap(net, loss_fn=None, optimizer=None, weights=None):
     """
-    TrainWrap
+    train_wrap
     """
     if loss_fn is None:
         loss_fn = nn.SoftmaxCrossEntropyWithLogits(reduction='mean')
diff --git a/mindspore/lite/examples/transfer_learning/model/transfer_learning_export.py b/mindspore/lite/examples/transfer_learning/model/transfer_learning_export.py
index a6009c7c2a..9d10cc9580 100755
--- a/mindspore/lite/examples/transfer_learning/model/transfer_learning_export.py
+++ b/mindspore/lite/examples/transfer_learning/model/transfer_learning_export.py
@@ -19,7 +19,7 @@ import mindspore as M
 from mindspore.nn import Cell
 from mindspore.train.serialization import load_checkpoint, export
 from effnet import effnet
-from train_utils import TrainWrap
+from train_utils import train_wrap
 
 
 class TransferNet(Cell):
@@ -51,7 +51,7 @@ HEAD.bias.set_data(M.Tensor(np.zeros(HEAD.bias.data.shape, dtype="float32")))
 
 sgd = M.nn.SGD(HEAD.trainable_params(), learning_rate=0.015, momentum=0.9,
                dampening=0.01, weight_decay=0.0, nesterov=False, loss_scale=1.0)
-net = TrainWrap(HEAD, optimizer=sgd)
+net = train_wrap(HEAD, optimizer=sgd)
 backbone_out = M.Tensor(np.zeros([BATCH_SIZE, 1000]).astype(np.float32))
 export(net, backbone_out, label, file_name="transfer_learning_tod_head", file_format='MINDIR')
 
diff --git a/mindspore/lite/examples/transfer_learning/src/dataset.cc b/mindspore/lite/examples/transfer_learning/src/dataset.cc
index 7a0669bb12..2f8d3c2844 100644
--- a/mindspore/lite/examples/transfer_learning/src/dataset.cc
+++ b/mindspore/lite/examples/transfer_learning/src/dataset.cc
@@ -50,6 +50,10 @@ float CH_MEAN[3] = {0.485, 0.456, 0.406};
 float CH_STD[3] = {0.229, 0.224, 0.225};
 
 using LabelId = std::map<std::string, int>;
+constexpr int kClassNum = 10;
+constexpr int kBGRDim = 2;
+constexpr float kRGBMAX = 255.0f;
+constexpr int kRGBDims = 3;
 
 static char *ReadBitmapFile(const std::string &filename, size_t *size) {
   MS_ASSERT(size != nullptr);
@@ -78,7 +82,7 @@ static char *ReadBitmapFile(const std::string &filename, size_t *size) {
 
   ifs.read(reinterpret_cast<char *>(bmp_image), bitmap_header.image_size_bytes);
 
-  size_t buffer_size = bitmap_header.width * bitmap_header.height * 3;
+  size_t buffer_size = bitmap_header.width * bitmap_header.height * kRGBDims;
   float *hwc_bin_image = new (std::nothrow) float[buffer_size];
   if (hwc_bin_image == nullptr) {
     free(bmp_image);
@@ -95,14 +99,16 @@ static char *ReadBitmapFile(const std::string &filename, size_t *size) {
   for (int h = 0; h < bitmap_header.height; h++) {
     for (int w = 0; w < bitmap_header.width; w++) {
       hwc_bin_image[h * hStride + w * channels + 0] =
-        (((static_cast<float>(bmp_image[(height - h - 1) * hStride + w * channels + 2])) / 255.0) - CH_MEAN[0]) /
+        (((static_cast<float>(bmp_image[(height - h - 1) * hStride + w * channels + kBGRDim])) / kRGBMAX) -
+         CH_MEAN[0]) /
         CH_STD[0];
       hwc_bin_image[h * hStride + w * channels + 1] =
-        (((static_cast<float>(bmp_image[(height - h - 1) * hStride + w * channels + 1])) / 255.0) - CH_MEAN[1]) /
+        (((static_cast<float>(bmp_image[(height - h - 1) * hStride + w * channels + 1])) / kRGBMAX) - CH_MEAN[1]) /
         CH_STD[1];
-      hwc_bin_image[h * hStride + w * channels + 2] =
-        (((static_cast<float>(bmp_image[(height - h - 1) * hStride + w * channels + 0])) / 255.0) - CH_MEAN[2]) /
-        CH_STD[2];
+      hwc_bin_image[h * hStride + w * channels + kBGRDim] =
+        (((static_cast<float>(bmp_image[(height - h - 1) * hStride + w * channels + 0])) / kRGBMAX) -
+         CH_MEAN[kBGRDim]) /
+        CH_STD[kBGRDim];
     }
   }
 
@@ -190,7 +196,7 @@ void DataSet::InitializeBMPFoldersDatabase(std::string dpath) {
 std::vector<FileTuple> DataSet::ReadDir(const std::string dpath) {
   std::vector<FileTuple> vec;
   struct dirent *entry = nullptr;
-  num_of_classes_ = 10;
+  num_of_classes_ = kClassNum;
   for (int class_id = 0; class_id < num_of_classes_; class_id++) {
     std::string dirname = dpath + "/" + std::to_string(class_id);
     DIR *dp = opendir(dirname.c_str());
diff --git a/mindspore/lite/examples/transfer_learning/src/net_runner.cc b/mindspore/lite/examples/transfer_learning/src/net_runner.cc
index d34172041e..449fc54a44 100644
--- a/mindspore/lite/examples/transfer_learning/src/net_runner.cc
+++ b/mindspore/lite/examples/transfer_learning/src/net_runner.cc
@@ -15,9 +15,9 @@
  */
 
 #include "src/net_runner.h"
-#include <math.h>
 #include <getopt.h>
 #include <algorithm>
+#include <cmath>
 #include <cstring>
 #include <fstream>
 #include <iostream>
@@ -26,6 +26,9 @@
 #include "src/utils.h"
 
 static unsigned int seed = time(NULL);
+constexpr int kBatchNum = 20;
+constexpr int kPrintNum = 10;
+constexpr float kThreshold = 0.9f;
 
 // Definition of callback function after forwarding operator.
 bool after_callback(const std::vector<mindspore::tensor::MSTensor *> &after_inputs,
@@ -35,7 +38,7 @@ bool after_callback(const std::vector<mindspore::tensor::MSTensor *> &after_inpu
   for (size_t i = 0; i < after_inputs.size(); i++) {
     int num2p = (after_inputs.at(i)->ElementsNum());
     std::cout << "in" << i << "(" << num2p << "): ";
-    if (num2p > 10) num2p = 10;
+    if (num2p > kPrintNum) num2p = kPrintNum;
     if (after_inputs.at(i)->data_type() == mindspore::kNumberTypeInt32) {
       auto d = reinterpret_cast<int *>(after_inputs.at(i)->MutableData());
       for (int j = 0; j < num2p; j++) {
@@ -53,7 +56,7 @@ bool after_callback(const std::vector<mindspore::tensor::MSTensor *> &after_inpu
     auto d = reinterpret_cast<float *>(after_outputs.at(i)->MutableData());
     int num2p = (after_outputs.at(i)->ElementsNum());
     std::cout << "ou" << i << "(" << num2p << "): ";
-    if (num2p > 10) num2p = 10;
+    if (num2p > kPrintNum) num2p = kPrintNum;
     for (int j = 0; j < num2p; j++) {
       std::cout << d[j] << ", ";
     }
@@ -72,7 +75,7 @@ void NetRunner::InitAndFigureInputs() {
   context.thread_num_ = 1;
 
   session_ = mindspore::session::LiteSession::CreateTransferSession(ms_backbone_file_, ms_head_file_, &context);
-  MS_ASSERT(nullptr != session_);
+  MS_ASSERT(session_ != nullptr);
 
   auto inputs = session_->GetInputs();
   MS_ASSERT(inputs.size() > 1);
@@ -108,7 +111,8 @@ std::vector<int> NetRunner::FillInputData(const std::vector<DataLabelTuple> &dat
   std::fill(labels, labels + inputs.at(label_index_)->ElementsNum(), 0.f);
   for (int i = 0; i < batch_size_; i++) {
     if (serially >= 0) {
-      idx = ++idx % total_size;
+      auto reminder = ++idx % total_size;
+      idx = reminder;
     } else {
       idx = rand_r(&seed) % total_size;
     }
@@ -191,13 +195,13 @@ int NetRunner::TrainLoop() {
     }
 
     std::cout << i + 1 << ": Loss is " << loss << " [min=" << min_loss << "]" << std::endl;
-    if ((i + 1) % 20 == 0) {
+    if ((i + 1) % kBatchNum == 0) {
       session_->Eval();
       float acc = CalculateAccuracy(ds_.test_data(), session_);
       session_->Train();
       if (max_acc < acc) max_acc = acc;
       std::cout << "accuracy on test data = " << acc << " max accuracy = " << max_acc << std::endl;
-      if (acc > 0.9) return 0;
+      if (acc > kThreshold) return 0;
     }
   }
   return 0;
diff --git a/mindspore/lite/include/train/accuracy_metrics.h b/mindspore/lite/include/train/accuracy_metrics.h
index e3822fd6e7..9dfa45172d 100644
--- a/mindspore/lite/include/train/accuracy_metrics.h
+++ b/mindspore/lite/include/train/accuracy_metrics.h
@@ -41,6 +41,7 @@ class AccuracyMetrics : public Metrics {
   std::vector<int> output_indexes_ = {0};
   float total_accuracy_ = 0.0;
   float total_steps_ = 0.0;
+  friend class ClassificationTrainAccuracyMonitor;
 };
 
 }  // namespace lite
diff --git a/mindspore/lite/include/train/classification_train_accuracy_monitor.h b/mindspore/lite/include/train/classification_train_accuracy_monitor.h
index 5c85592806..3df8af97ab 100644
--- a/mindspore/lite/include/train/classification_train_accuracy_monitor.h
+++ b/mindspore/lite/include/train/classification_train_accuracy_monitor.h
@@ -16,6 +16,7 @@
 #ifndef MINDSPORE_LITE_INCLUDE_TRAIN_CLASSIFICATION_TRAIN_ACCURACY_MONITOR_H_
 #define MINDSPORE_LITE_INCLUDE_TRAIN_CLASSIFICATION_TRAIN_ACCURACY_MONITOR_H_
 #include <vector>
+#include <memory>
 #include <string>
 #include <utility>
 #include <climits>
@@ -44,9 +45,7 @@ class ClassificationTrainAccuracyMonitor : public session::TrainLoopCallBack {
 
  private:
   std::vector<GraphPoint> accuracies_;
-  int accuracy_metrics_ = METRICS_CLASSIFICATION;
-  std::vector<int> input_indexes_ = {1};
-  std::vector<int> output_indexes_ = {0};
+  std::shared_ptr<AccuracyMetrics> accuracy_metrics_;
   int print_every_n_ = 0;
 };
 
diff --git a/mindspore/lite/src/huffman_decode.cc b/mindspore/lite/src/huffman_decode.cc
index 44a0dc33b2..92efb73fcc 100644
--- a/mindspore/lite/src/huffman_decode.cc
+++ b/mindspore/lite/src/huffman_decode.cc
@@ -19,7 +19,7 @@
 
 namespace mindspore {
 namespace lite {
-STATUS HuffmanDecode::DoHuffmanDecode(const std::string &input_str, void *decoded_data) {
+STATUS HuffmanDecode::DoHuffmanDecode(const std::string &input_str, void *decoded_data, size_t data_len) {
   if (decoded_data == nullptr) {
     MS_LOG(ERROR) << "decoded_data is nullptr.";
     return RET_ERROR;
@@ -57,8 +57,12 @@ STATUS HuffmanDecode::DoHuffmanDecode(const std::string &input_str, void *decode
   }
 
   size_t len = huffman_decoded_str.length();
-  memcpy(decoded_data, huffman_decoded_str.c_str(), len);
-
+  if (data_len >= len) {
+    memcpy(decoded_data, huffman_decoded_str.c_str(), len);
+  } else {
+    FreeHuffmanNodeTree(root);
+    return RET_ERROR;
+  }
   FreeHuffmanNodeTree(root);
   return RET_OK;
 }
@@ -173,6 +177,5 @@ void HuffmanDecode::FreeHuffmanNodeTree(HuffmanNodePtr root) {
     delete (cur_node);
   }
 }
-
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/huffman_decode.h b/mindspore/lite/src/huffman_decode.h
index 0495fd06c6..587af1727d 100644
--- a/mindspore/lite/src/huffman_decode.h
+++ b/mindspore/lite/src/huffman_decode.h
@@ -42,7 +42,7 @@ class HuffmanDecode {
  public:
   virtual ~HuffmanDecode() = default;
 
-  static STATUS DoHuffmanDecode(const std::string &input_str, void *decoded_data);
+  static STATUS DoHuffmanDecode(const std::string &input_str, void *decoded_data, size_t data_len);
 
  private:
   HuffmanDecode() = default;
diff --git a/mindspore/lite/src/ops/populate/arithmetic_populate.cc b/mindspore/lite/src/ops/populate/arithmetic_populate.cc
index f32f601932..2c4f82db08 100644
--- a/mindspore/lite/src/ops/populate/arithmetic_populate.cc
+++ b/mindspore/lite/src/ops/populate/arithmetic_populate.cc
@@ -15,6 +15,7 @@
  */
 #include "src/ops/populate/arithmetic_populate.h"
 #include "src/ops/populate/populate_register.h"
+using mindspore::schema::PrimitiveType_BiasAddGrad;
 using mindspore::schema::PrimitiveType_Equal;
 using mindspore::schema::PrimitiveType_FloorDiv;
 using mindspore::schema::PrimitiveType_FloorMod;
@@ -79,5 +80,6 @@ REG_POPULATE(PrimitiveType_FloorDiv, PopulateArithmetic, SCHEMA_CUR)
 REG_POPULATE(PrimitiveType_FloorMod, PopulateArithmetic, SCHEMA_CUR)
 REG_POPULATE(PrimitiveType_Mod, PopulateArithmetic, SCHEMA_CUR)
 REG_POPULATE(PrimitiveType_SquaredDifference, PopulateArithmetic, SCHEMA_CUR)
+REG_POPULATE(PrimitiveType_BiasAddGrad, PopulateArithmetic, SCHEMA_CUR)
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/ops/populate/bias_grad_populate.cc b/mindspore/lite/src/ops/populate/bias_grad_populate.cc
deleted file mode 100644
index edcfec3589..0000000000
--- a/mindspore/lite/src/ops/populate/bias_grad_populate.cc
+++ /dev/null
@@ -1,39 +0,0 @@
-/**
- * Copyright 2019-2021 Huawei Technologies Co., Ltd
- *
- * 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.
- */
-#include "src/ops/populate/populate_register.h"
-#include "nnacl/arithmetic.h"
-using mindspore::schema::PrimitiveType_BiasAddGrad;
-
-namespace mindspore {
-namespace lite {
-OpParameter *PopulateBiasAddGradParameter(const void *prim) {
-  auto primitive = static_cast<const schema::Primitive *>(prim);
-  MS_ASSERT(primitive != nullptr);
-
-  auto *param = reinterpret_cast<ArithmeticParameter *>(malloc(sizeof(ArithmeticParameter)));
-  if (param == nullptr) {
-    MS_LOG(ERROR) << "malloc ArithmeticParameter failed.";
-    return nullptr;
-  }
-  memset(param, 0, sizeof(ArithmeticParameter));
-
-  param->op_parameter_.type_ = primitive->value_type();
-  return reinterpret_cast<OpParameter *>(param);
-}
-
-REG_POPULATE(PrimitiveType_BiasAddGrad, PopulateBiasAddGradParameter, SCHEMA_CUR);
-}  // namespace lite
-}  // namespace mindspore
diff --git a/mindspore/lite/src/train/accuracy_metrics.cc b/mindspore/lite/src/train/accuracy_metrics.cc
index 6b79088ce6..6d6a5c5ddd 100644
--- a/mindspore/lite/src/train/accuracy_metrics.cc
+++ b/mindspore/lite/src/train/accuracy_metrics.cc
@@ -22,7 +22,6 @@
 
 namespace mindspore {
 namespace lite {
-
 AccuracyMetrics::AccuracyMetrics(int accuracy_metrics, const std::vector<int> &input_indexes,
                                  const std::vector<int> &output_indexes)
     : Metrics() {
@@ -66,6 +65,5 @@ float AccuracyMetrics::Eval() {
 
   return (total_accuracy_ / total_steps_);
 }
-
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/train/accuracy_monitor.cc b/mindspore/lite/src/train/accuracy_monitor.cc
index a9aabdce72..0cb3b5d404 100644
--- a/mindspore/lite/src/train/accuracy_monitor.cc
+++ b/mindspore/lite/src/train/accuracy_monitor.cc
@@ -29,7 +29,6 @@
 
 namespace mindspore {
 namespace lite {
-
 void AccuracyMonitor::Begin(const session::TrainLoopCallBackData &cb_data) {
   if (cb_data.epoch_ == 0) accuracies_.clear();
 }
@@ -40,6 +39,5 @@ int AccuracyMonitor::EpochEnd(const session::TrainLoopCallBackData &cb_data) {
   accuracies_.push_back(std::make_pair(cb_data.epoch_, 0.0));
   return mindspore::session::RET_CONTINUE;
 }
-
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/train/classification_train_accuracy_monitor.cc b/mindspore/lite/src/train/classification_train_accuracy_monitor.cc
index d398429a7e..d806902315 100644
--- a/mindspore/lite/src/train/classification_train_accuracy_monitor.cc
+++ b/mindspore/lite/src/train/classification_train_accuracy_monitor.cc
@@ -26,21 +26,10 @@ using mindspore::WARNING;
 
 namespace mindspore {
 namespace lite {
-
 ClassificationTrainAccuracyMonitor::ClassificationTrainAccuracyMonitor(int print_every_n, int accuracy_metrics,
                                                                        const std::vector<int> &input_indexes,
                                                                        const std::vector<int> &output_indexes) {
-  if (input_indexes.size() == output_indexes.size()) {
-    input_indexes_ = input_indexes;
-    output_indexes_ = output_indexes;
-  } else {
-    MS_LOG(WARNING) << "input to output mapping vectors sizes do not match";
-  }
-  if (accuracy_metrics != METRICS_CLASSIFICATION) {
-    MS_LOG(WARNING) << "Only classification metrics is supported";
-  } else {
-    accuracy_metrics_ = accuracy_metrics;
-  }
+  accuracy_metrics_ = std::make_shared<AccuracyMetrics>(accuracy_metrics, input_indexes, output_indexes);
   print_every_n_ = print_every_n;
 }
 
@@ -59,8 +48,8 @@ void ClassificationTrainAccuracyMonitor::EpochBegin(const session::TrainLoopCall
 int ClassificationTrainAccuracyMonitor::EpochEnd(const session::TrainLoopCallBackData &cb_data) {
   if (cb_data.step_ > 0) accuracies_.at(cb_data.epoch_).second /= static_cast<float>(cb_data.step_ + 1);
   if ((cb_data.epoch_ + 1) % print_every_n_ == 0) {
-    std::cout << "Epoch (" << cb_data.epoch_ + 1 << "):\tTraining Accuracy is " << accuracies_.at(cb_data.epoch_).second
-              << std::endl;
+    std::cout << "Epoch (" << (cb_data.epoch_ + 1) << "):\tTraining Accuracy is "
+              << accuracies_.at(cb_data.epoch_).second << std::endl;
   }
   return mindspore::session::RET_CONTINUE;
 }
@@ -70,21 +59,22 @@ void ClassificationTrainAccuracyMonitor::StepEnd(const session::TrainLoopCallBac
   auto outputs = cb_data.session_->GetPredictions();
 
   float accuracy = 0.0;
-  for (unsigned int i = 0; i < input_indexes_.size(); i++) {
-    if ((inputs.size() <= static_cast<unsigned int>(input_indexes_[i])) ||
-        (outputs.size() <= static_cast<unsigned int>(output_indexes_[i]))) {
-      MS_LOG(WARNING) << "indices " << input_indexes_[i] << "/" << output_indexes_[i]
+  auto input_indexes = accuracy_metrics_->input_indexes_;
+  auto output_indexes = accuracy_metrics_->output_indexes_;
+  for (unsigned int i = 0; i < input_indexes.size(); i++) {
+    if ((inputs.size() <= static_cast<unsigned int>(input_indexes[i])) ||
+        (outputs.size() <= static_cast<unsigned int>(output_indexes[i]))) {
+      MS_LOG(WARNING) << "indices " << input_indexes[i] << "/" << output_indexes[i]
                       << " is outside of input/output range";
       return;
     }
-    if (inputs.at(input_indexes_[i])->data_type() == kNumberTypeInt32) {
-      accuracy += CalculateSparseClassification(inputs.at(input_indexes_[i]), outputs.at(output_indexes_[i]));
+    if (inputs.at(input_indexes[i])->data_type() == kNumberTypeInt32) {
+      accuracy += CalculateSparseClassification(inputs.at(input_indexes[i]), outputs.at(output_indexes[i]));
     } else {
-      accuracy += CalculateOneHotClassification(inputs.at(input_indexes_[i]), outputs.at(output_indexes_[i]));
+      accuracy += CalculateOneHotClassification(inputs.at(input_indexes[i]), outputs.at(output_indexes[i]));
     }
   }
   accuracies_.at(cb_data.epoch_).second += accuracy;
 }
-
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/train/loss_monitor.cc b/mindspore/lite/src/train/loss_monitor.cc
index bd3e529d78..60637f9b1b 100644
--- a/mindspore/lite/src/train/loss_monitor.cc
+++ b/mindspore/lite/src/train/loss_monitor.cc
@@ -26,7 +26,6 @@
 
 namespace mindspore {
 namespace lite {
-
 void LossMonitor::Begin(const session::TrainLoopCallBackData &cb_data) {
   if (cb_data.epoch_ == 0) losses_.clear();
 }
@@ -42,7 +41,7 @@ void LossMonitor::EpochBegin(const session::TrainLoopCallBackData &cb_data) {
 int LossMonitor::EpochEnd(const session::TrainLoopCallBackData &cb_data) {
   if (cb_data.step_ > 0) losses_.at(cb_data.epoch_).second /= static_cast<float>(cb_data.step_ + 1);
   if (print_every_n_ > 0) {
-    std::cout << "Epoch (" << cb_data.epoch_ + 1 << "):\tLoss is " << losses_.at(cb_data.epoch_).second << std::endl;
+    std::cout << "Epoch (" << (cb_data.epoch_ + 1) << "):\tLoss is " << losses_.at(cb_data.epoch_).second << std::endl;
   }
   return mindspore::session::RET_CONTINUE;
 }
@@ -54,12 +53,11 @@ void LossMonitor::StepEnd(const session::TrainLoopCallBackData &cb_data) {
       auto loss = reinterpret_cast<float *>(it->second->MutableData());
       losses_.at(cb_data.epoch_).second += loss[0];
       if ((cb_data.step_ + 1) % print_every_n_ == 0)
-        std::cout << cb_data.epoch_ + 1 << "." << cb_data.step_ + 1 << ":\tLoss is " << loss[0] << std::endl;
+        std::cout << (cb_data.epoch_ + 1) << "." << (cb_data.step_ + 1) << ":\tLoss is " << loss[0] << std::endl;
       return;
     }
   }
   MS_LOG(WARNING) << "Model does not have a loss output tensor of size 1";
 }
-
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/train/lr_scheduler.cc b/mindspore/lite/src/train/lr_scheduler.cc
index ea9d074027..d9713c3ba4 100644
--- a/mindspore/lite/src/train/lr_scheduler.cc
+++ b/mindspore/lite/src/train/lr_scheduler.cc
@@ -29,7 +29,6 @@
 
 namespace mindspore {
 namespace lite {
-
 int MultiplicativeLRLambda(float *lr, int epoch, void *lr_cb_data) {
   if ((lr == nullptr) || (lr_cb_data == nullptr)) {
     MS_LOG(ERROR) << "nullptr passed as input to MultiplicativeLRLambda";
@@ -70,6 +69,5 @@ int LRScheduler::EpochEnd(const session::TrainLoopCallBackData &cb_data) {
   }
   return mindspore::session::RET_CONTINUE;
 }
-
 }  // namespace lite
 }  // namespace mindspore
diff --git a/mindspore/lite/src/train/train_loop.cc b/mindspore/lite/src/train/train_loop.cc
index 93ab4422bd..4f3f9049a1 100644
--- a/mindspore/lite/src/train/train_loop.cc
+++ b/mindspore/lite/src/train/train_loop.cc
@@ -25,7 +25,6 @@
 
 namespace mindspore {
 namespace lite {
-
 using dataset::Dataset;
 using dataset::Iterator;
 using dataset::MSTensorVec;
@@ -132,8 +131,8 @@ int TrainLoop::LoadData(std::vector<tensor::MSTensor *> inputs, dataset::MSTenso
   }
 
   for (unsigned int i = 0; i < num_of_inputs; i++) {
-    unsigned char *input_data = reinterpret_cast<unsigned char *>(inputs.at(i)->MutableData());
-    const unsigned char *row_data = reinterpret_cast<const unsigned char *>(row_vec->at(i).MutableData());
+    auto *input_data = reinterpret_cast<unsigned char *>(inputs.at(i)->MutableData());
+    const auto *row_data = reinterpret_cast<const unsigned char *>(row_vec->at(i).MutableData());
     auto data_size = row_vec->at(i).DataSize();
     if (data_size != inputs.at(i)->Size()) {
       MS_LOG(WARNING) << "Model Input tensor " << i << " size (" << inputs.at(i)->Size()
@@ -144,32 +143,10 @@ int TrainLoop::LoadData(std::vector<tensor::MSTensor *> inputs, dataset::MSTenso
   }
   return RET_OK;
 }
-
-int TrainLoop::LoadPartialData(std::vector<tensor::MSTensor *> inputs, dataset::MSTensorVec *row_vec) {
-  auto num_of_inputs = inputs.size();
-  if ((num_of_inputs == 0) || (row_vec == nullptr) || (num_of_inputs < row_vec->size())) {
-    return RET_STOP_TRAINING;
-  }
-
-  for (unsigned int i = 0; i < row_vec->size(); i++) {
-    unsigned char *input_data = reinterpret_cast<unsigned char *>(inputs.at(i)->MutableData());
-    const unsigned char *row_data = reinterpret_cast<const unsigned char *>(row_vec->at(i).MutableData());
-    auto data_size = row_vec->at(i).DataSize();
-    if (data_size != inputs.at(i)->Size()) {
-      MS_LOG(WARNING) << "Model Input tensor " << i << " size (" << inputs.at(i)->Size()
-                      << ") does not match dataset size (" << data_size << ")\n";
-      return RET_STOP_TRAINING;
-    }
-    std::copy(row_data, row_data + data_size, input_data);
-  }
-  return RET_OK;
-}
-
 }  // namespace lite
 
 session::TrainLoop *session::TrainLoop::CreateTrainLoop(session::LiteSession *train_session) {
   auto loop = new (std::nothrow) lite::TrainLoop(train_session);
   return loop;
 }
-
 }  // namespace mindspore
diff --git a/mindspore/lite/src/train/train_loop.h b/mindspore/lite/src/train/train_loop.h
index e35a71afb3..40a63dad42 100644
--- a/mindspore/lite/src/train/train_loop.h
+++ b/mindspore/lite/src/train/train_loop.h
@@ -63,7 +63,6 @@ class TrainLoop : virtual public session::TrainLoop {
 
  protected:
   static int LoadData(std::vector<tensor::MSTensor *> inputs, dataset::MSTensorVec *dataset_vec);
-  static int LoadPartialData(std::vector<tensor::MSTensor *> inputs, dataset::MSTensorVec *dataset_vec);
 
   session::LiteSession *train_session_ = nullptr;
   unsigned int epoch_ = 0;
diff --git a/mindspore/lite/src/train/train_populate_parameter_v0.cc b/mindspore/lite/src/train/train_populate_parameter_v0.cc
index 072dfb086b..80c907e83d 100644
--- a/mindspore/lite/src/train/train_populate_parameter_v0.cc
+++ b/mindspore/lite/src/train/train_populate_parameter_v0.cc
@@ -592,7 +592,6 @@ OpParameter *PopulateArithmeticGradParameter(const void *primitive) {
   }
   return reinterpret_cast<OpParameter *>(arithmetic_param);
 }
-
 }  // namespace
 
 void PopulateTrainV0Parameters() {
@@ -665,5 +664,4 @@ void PopulateTrainV0Parameters() {
   lite::Registry g_sigmoidCrossEntropyWithLogitsGradRegistry(
     schema::v0::PrimitiveType_SigmoidCrossEntropyWithLogitsGrad, DefaultPopulateParameter, mindspore::lite::SCHEMA_V0);
 }
-
 }  // namespace mindspore::kernel
diff --git a/mindspore/lite/src/weight_decoder.cc b/mindspore/lite/src/weight_decoder.cc
index 86492d77c1..ece9582fd3 100644
--- a/mindspore/lite/src/weight_decoder.cc
+++ b/mindspore/lite/src/weight_decoder.cc
@@ -255,7 +255,7 @@ int WeightDecoder::DecodeHuffmanCode(const schema::Tensor &src_tensor, lite::Ten
   }
   auto dst_data = dst_tensor->data_c();
   MS_ASSERT(dst_data != nullptr);
-  ret = HuffmanDecode::DoHuffmanDecode(encode_str, dst_data);
+  ret = HuffmanDecode::DoHuffmanDecode(encode_str, dst_data, dst_tensor->Size());
   if (ret != RET_OK) {
     MS_LOG(ERROR) << "DoHuffmanDecode failed.";
     return ret;