!6639 add monilenetv2_quant and resnet50_quant st

Merge pull request !6639 from hwjiaorui/master

tests/st/quantization/mobilenetv2_quant/dataset.py

@@ -0,0 +1,67 @@
+# Copyright 2020 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.
+# ============================================================================
+""" create train dataset. """
+
+from functools import partial
+import mindspore.dataset as ds
+import mindspore.common.dtype as mstype
+import mindspore.dataset.vision.c_transforms as C
+import mindspore.dataset.transforms.c_transforms as C2
+
+
+def create_dataset(dataset_path, config, repeat_num=1, batch_size=32):
+    """
+    create a train dataset
+
+    Args:
+        dataset_path(string): the path of dataset.
+        config(EasyDict)：the basic config for training
+        repeat_num(int): the repeat times of dataset. Default: 1.
+        batch_size(int): the batch size of dataset. Default: 32.
+
+    Returns:
+        dataset
+    """
+
+    load_func = partial(ds.Cifar10Dataset, dataset_path)
+    cifar_ds = load_func(num_parallel_workers=8, shuffle=False)
+
+    resize_height = config.image_height
+    resize_width = config.image_width
+    rescale = 1.0 / 255.0
+    shift = 0.0
+
+    # define map operations
+    # interpolation default BILINEAR
+    resize_op = C.Resize((resize_height, resize_width))
+    rescale_op = C.Rescale(rescale, shift)
+    normalize_op = C.Normalize(
+        (0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010))
+    changeswap_op = C.HWC2CHW()
+    type_cast_op = C2.TypeCast(mstype.int32)
+
+    c_trans = [resize_op, rescale_op, normalize_op, changeswap_op]
+
+    # apply map operations on images
+    cifar_ds = cifar_ds.map(input_columns="label", operations=type_cast_op)
+    cifar_ds = cifar_ds.map(input_columns="image", operations=c_trans)
+
+    # apply batch operations
+    cifar_ds = cifar_ds.batch(batch_size, drop_remainder=True)
+
+    # apply dataset repeat operation
+    cifar_ds = cifar_ds.repeat(repeat_num)
+
+    return cifar_ds

tests/st/quantization/mobilenetv2_quant/lr_generator.py

@@ -0,0 +1,56 @@
+# Copyright 2020 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.
+# ============================================================================
+"""learning rate generator"""
+
+import math
+import numpy as np
+
+
+def get_lr(global_step, lr_init, lr_end, lr_max, warmup_epochs, total_epochs, steps_per_epoch):
+    """
+    generate learning rate array
+
+    Args:
+       global_step(int): total steps of the training
+       lr_init(float): init learning rate
+       lr_end(float): end learning rate
+       lr_max(float): max learning rate
+       warmup_epochs(int): number of warmup epochs
+       total_epochs(int): total epoch of training
+       steps_per_epoch(int): steps of one epoch
+
+    Returns:
+       np.array, learning rate array
+    """
+    lr_each_step = []
+    total_steps = steps_per_epoch * total_epochs
+    warmup_steps = steps_per_epoch * warmup_epochs
+    for i in range(total_steps):
+        if i < warmup_steps:
+            lr = lr_init + (lr_max - lr_init) * i / warmup_steps
+        else:
+            lr = lr_end + \
+                (lr_max - lr_end) * \
+                (1. + math.cos(math.pi * (i - warmup_steps) /
+                               (total_steps - warmup_steps))) / 2.
+        if lr < 0.0:
+            lr = 0.0
+        lr_each_step.append(lr)
+
+    current_step = global_step
+    lr_each_step = np.array(lr_each_step).astype(np.float32)
+    learning_rate = lr_each_step[current_step:]
+
+    return learning_rate

tests/st/quantization/mobilenetv2_quant/test_mobilenetv2_quant.py

@@ -0,0 +1,123 @@
+# Copyright 2020 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.
+# ============================================================================
+"""Train Mobilenetv2_quant on Cifar10"""
+
+
+import pytest
+import numpy as np
+from easydict import EasyDict as ed
+
+from mindspore import context
+from mindspore import Tensor
+from mindspore import nn
+from mindspore.train.model import Model
+from mindspore.train.quant import quant
+from mindspore.common import set_seed
+
+from dataset import create_dataset
+from lr_generator import get_lr
+from utils import Monitor, CrossEntropyWithLabelSmooth
+from mobilenetV2 import mobilenetV2
+
+config_ascend_quant = ed({
+    "num_classes": 10,
+    "image_height": 224,
+    "image_width": 224,
+    "batch_size": 200,
+    "step_threshold": 10,
+    "data_load_mode": "mindata",
+    "epoch_size": 1,
+    "start_epoch": 200,
+    "warmup_epochs": 1,
+    "lr": 0.3,
+    "momentum": 0.9,
+    "weight_decay": 4e-5,
+    "label_smooth": 0.1,
+    "loss_scale": 1024,
+    "save_checkpoint": True,
+    "save_checkpoint_epochs": 1,
+    "keep_checkpoint_max": 300,
+    "save_checkpoint_path": "./checkpoint",
+    "quantization_aware": True,
+})
+
+dataset_path = "/dataset/workspace/mindspore_dataset/cifar-10-batches-bin/"
+
+
+@pytest.mark.level1
+@pytest.mark.platform_arm_ascend_training
+@pytest.mark.platform_x86_ascend_training
+@pytest.mark.env_onecard
+def train_on_ascend():
+    set_seed(1)
+    context.set_context(mode=context.GRAPH_MODE, device_target="Ascend")
+    config = config_ascend_quant
+    print("training configure: {}".format(config))
+
+    epoch_size = config.epoch_size
+
+    # define network
+    network = mobilenetV2(num_classes=config.num_classes)
+    # define loss
+    if config.label_smooth > 0:
+        loss = CrossEntropyWithLabelSmooth(
+            smooth_factor=config.label_smooth, num_classes=config.num_classes)
+    else:
+        loss = nn.SoftmaxCrossEntropyWithLogits(sparse=True, reduction='mean')
+    # define dataset
+    dataset = create_dataset(dataset_path=dataset_path,
+                             config=config,
+                             repeat_num=1,
+                             batch_size=config.batch_size)
+    step_size = dataset.get_dataset_size()
+
+    # convert fusion network to quantization aware network
+    network = quant.convert_quant_network(network,
+                                          bn_fold=True,
+                                          per_channel=[True, False],
+                                          symmetric=[True, False])
+
+    # get learning rate
+    lr = Tensor(get_lr(global_step=config.start_epoch * step_size,
+                       lr_init=0,
+                       lr_end=0,
+                       lr_max=config.lr,
+                       warmup_epochs=config.warmup_epochs,
+                       total_epochs=epoch_size + config.start_epoch,
+                       steps_per_epoch=step_size))
+
+    # define optimization
+    opt = nn.Momentum(filter(lambda x: x.requires_grad, network.get_parameters()), lr, config.momentum,
+                      config.weight_decay)
+    # define model
+    model = Model(network, loss_fn=loss, optimizer=opt)
+
+    print("============== Starting Training ==============")
+    monitor = Monitor(lr_init=lr.asnumpy(),
+                      step_threshold=config.step_threshold)
+    callback = [monitor]
+    model.train(epoch_size, dataset, callbacks=callback,
+                dataset_sink_mode=False)
+    print("============== End Training ==============")
+
+    expect_avg_step_loss = 2.32
+    avg_step_loss = np.mean(np.array(monitor.losses))
+
+    print("average step loss:{}".format(avg_step_loss))
+    assert avg_step_loss < expect_avg_step_loss
+
+
+if __name__ == '__main__':
+    train_on_ascend()

tests/st/quantization/mobilenetv2_quant/utils.py

@@ -0,0 +1,118 @@
+# Copyright 2020 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.
+# ============================================================================
+"""MobileNetV2 utils"""
+
+import time
+import numpy as np
+
+from mindspore.train.callback import Callback
+from mindspore import Tensor
+from mindspore import nn
+from mindspore.nn.loss.loss import _Loss
+from mindspore.ops import operations as P
+from mindspore.ops import functional as F
+from mindspore.common import dtype as mstype
+
+
+class Monitor(Callback):
+    """
+    Monitor loss and time.
+
+    Args:
+        lr_init (numpy array): train lr
+
+    Returns:
+        None
+
+    Examples:
+        >>> Monitor(100,lr_init=Tensor([0.05]*100).asnumpy())
+    """
+
+    def __init__(self, lr_init=None, step_threshold=10):
+        super(Monitor, self).__init__()
+        self.lr_init = lr_init
+        self.lr_init_len = len(lr_init)
+        self.step_threshold = step_threshold
+
+    def epoch_begin(self, run_context):
+        self.losses = []
+        self.epoch_time = time.time()
+
+    def epoch_end(self, run_context):
+        cb_params = run_context.original_args()
+
+        epoch_mseconds = (time.time() - self.epoch_time) * 1000
+        per_step_mseconds = epoch_mseconds / cb_params.batch_num
+        print("epoch time: {:5.3f}, per step time: {:5.3f}, avg loss: {:8.6f}".format(epoch_mseconds,
+                                                                                      per_step_mseconds,
+                                                                                      np.mean(self.losses)))
+        self.epoch_mseconds = epoch_mseconds
+
+    def step_begin(self, run_context):
+        self.step_time = time.time()
+
+    def step_end(self, run_context):
+        cb_params = run_context.original_args()
+        step_mseconds = (time.time() - self.step_time) * 1000
+        step_loss = cb_params.net_outputs
+
+        if isinstance(step_loss, (tuple, list)) and isinstance(step_loss[0], Tensor):
+            step_loss = step_loss[0]
+        if isinstance(step_loss, Tensor):
+            step_loss = np.mean(step_loss.asnumpy())
+
+        self.losses.append(step_loss)
+        cur_step_in_epoch = (cb_params.cur_step_num - 1) % cb_params.batch_num
+
+        print("epoch: [{:3d}/{:3d}], step:[{:5d}/{:5d}], loss:[{:8.6f}/{:5.3f}], time:[{:5.3f}], lr:[{:5.5f}]".format(
+            cb_params.cur_epoch_num, cb_params.epoch_num, cur_step_in_epoch +
+            1, cb_params.batch_num, step_loss,
+            np.mean(self.losses), step_mseconds, self.lr_init[cb_params.cur_step_num - 1]))
+
+        if cb_params.cur_step_num == self.step_threshold:
+            run_context.request_stop()
+
+
+class CrossEntropyWithLabelSmooth(_Loss):
+    """
+    CrossEntropyWith LabelSmooth.
+
+    Args:
+        smooth_factor (float): smooth factor, default=0.
+        num_classes (int): num classes
+
+    Returns:
+        None.
+
+    Examples:
+        >>> CrossEntropyWithLabelSmooth(smooth_factor=0., num_classes=1000)
+    """
+
+    def __init__(self, smooth_factor=0., num_classes=1000):
+        super(CrossEntropyWithLabelSmooth, self).__init__()
+        self.onehot = P.OneHot()
+        self.on_value = Tensor(1.0 - smooth_factor, mstype.float32)
+        self.off_value = Tensor(1.0 * smooth_factor /
+                                (num_classes - 1), mstype.float32)
+        self.ce = nn.SoftmaxCrossEntropyWithLogits()
+        self.mean = P.ReduceMean(False)
+        self.cast = P.Cast()
+
+    def construct(self, logit, label):
+        one_hot_label = self.onehot(self.cast(label, mstype.int32), F.shape(logit)[1],
+                                    self.on_value, self.off_value)
+        out_loss = self.ce(logit, one_hot_label)
+        out_loss = self.mean(out_loss, 0)
+        return out_loss

tests/st/quantization/resnet50_quant/dataset.py

@@ -0,0 +1,68 @@
+# Copyright 2020 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.
+# ============================================================================
+""" create train dataset. """
+
+
+from functools import partial
+
+import mindspore.common.dtype as mstype
+import mindspore.dataset.engine as de
+import mindspore.dataset.transforms.c_transforms as C2
+import mindspore.dataset.vision.c_transforms as C
+
+
+def create_dataset(dataset_path, config, repeat_num=1, batch_size=32):
+    """
+    create a train dataset
+
+    Args:
+        dataset_path(string): the path of dataset.
+        config(EasyDict)：the basic config for training
+        repeat_num(int): the repeat times of dataset. Default: 1.
+        batch_size(int): the batch size of dataset. Default: 32.
+
+    Returns:
+        dataset
+    """
+
+    load_func = partial(de.Cifar10Dataset, dataset_path)
+    ds = load_func(num_parallel_workers=8, shuffle=False)
+
+    resize_height = config.image_height
+    resize_width = config.image_width
+
+    mean = [0.485 * 255, 0.456 * 255, 0.406 * 255]
+    std = [0.229 * 255, 0.224 * 255, 0.225 * 255]
+
+    # define map operations
+    resize_op = C.Resize((resize_height, resize_width))
+    normalize_op = C.Normalize(mean=mean, std=std)
+    changeswap_op = C.HWC2CHW()
+    c_trans = [resize_op, normalize_op, changeswap_op]
+
+    type_cast_op = C2.TypeCast(mstype.int32)
+
+    ds = ds.map(operations=c_trans, input_columns="image",
+                num_parallel_workers=8)
+    ds = ds.map(operations=type_cast_op,
+                input_columns="label", num_parallel_workers=8)
+
+    # apply batch operations
+    ds = ds.batch(batch_size, drop_remainder=True)
+
+    # apply dataset repeat operation
+    ds = ds.repeat(repeat_num)
+
+    return ds

tests/st/quantization/resnet50_quant/lr_generator.py

@@ -0,0 +1,93 @@
+# Copyright 2020 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.
+# ============================================================================
+"""learning rate generator"""
+
+import math
+import numpy as np
+
+
+def get_lr(lr_init, lr_end, lr_max, warmup_epochs, total_epochs, steps_per_epoch, lr_decay_mode):
+    """
+    generate learning rate array
+
+    Args:
+       lr_init(float): init learning rate
+       lr_end(float): end learning rate
+       lr_max(float): max learning rate
+       warmup_epochs(int): number of warmup epochs
+       total_epochs(int): total epoch of training
+       steps_per_epoch(int): steps of one epoch
+       lr_decay_mode(string): learning rate decay mode, including steps, poly, cosine or default
+
+    Returns:
+       np.array, learning rate array
+    """
+    lr_each_step = []
+    total_steps = steps_per_epoch * total_epochs
+    warmup_steps = steps_per_epoch * warmup_epochs
+    if lr_decay_mode == 'steps':
+        decay_epoch_index = [0.3 * total_steps,
+                             0.6 * total_steps, 0.8 * total_steps]
+        for i in range(total_steps):
+            if i < decay_epoch_index[0]:
+                lr = lr_max
+            elif i < decay_epoch_index[1]:
+                lr = lr_max * 0.1
+            elif i < decay_epoch_index[2]:
+                lr = lr_max * 0.01
+            else:
+                lr = lr_max * 0.001
+            lr_each_step.append(lr)
+    elif lr_decay_mode == 'poly':
+        if warmup_steps != 0:
+            inc_each_step = (float(lr_max) - float(lr_init)) / \
+                float(warmup_steps)
+        else:
+            inc_each_step = 0
+        for i in range(total_steps):
+            if i < warmup_steps:
+                lr = float(lr_init) + inc_each_step * float(i)
+            else:
+                base = (1.0 - (float(i) - float(warmup_steps)) /
+                        (float(total_steps) - float(warmup_steps)))
+                lr = float(lr_max) * base * base
+                if lr < 0.0:
+                    lr = 0.0
+            lr_each_step.append(lr)
+    elif lr_decay_mode == 'cosine':
+        decay_steps = total_steps - warmup_steps
+        for i in range(total_steps):
+            if i < warmup_steps:
+                lr_inc = (float(lr_max) - float(lr_init)) / float(warmup_steps)
+                lr = float(lr_init) + lr_inc * (i + 1)
+            else:
+                linear_decay = (total_steps - i) / decay_steps
+                cosine_decay = 0.5 * \
+                    (1 + math.cos(math.pi * 2 * 0.47 * i / decay_steps))
+                decayed = linear_decay * cosine_decay + 0.00001
+                lr = lr_max * decayed
+            lr_each_step.append(lr)
+    else:
+        for i in range(total_steps):
+            if i < warmup_steps:
+                lr = lr_init + (lr_max - lr_init) * i / warmup_steps
+            else:
+                lr = lr_max - (lr_max - lr_end) * \
+                    (i - warmup_steps) / (total_steps - warmup_steps)
+            lr_each_step.append(lr)
+
+    learning_rate = np.array(lr_each_step).astype(np.float32)
+
+    return learning_rate

tests/st/quantization/resnet50_quant/test_resnet50_quant.py

@@ -0,0 +1,131 @@
+# Copyright 2020 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.
+# ============================================================================
+"""Train Resnet50_quant on Cifar10"""
+
+import pytest
+import numpy as np
+from easydict import EasyDict as ed
+
+from mindspore import context
+from mindspore import Tensor
+from mindspore.nn.optim.momentum import Momentum
+from mindspore.train.model import Model
+from mindspore.train.quant import quant
+from mindspore import set_seed
+
+from resnet_quant_manual import resnet50_quant
+from dataset import create_dataset
+from lr_generator import get_lr
+from utils import Monitor, CrossEntropy
+
+
+config_quant = ed({
+    "class_num": 10,
+    "batch_size": 128,
+    "step_threshold": 20,
+    "loss_scale": 1024,
+    "momentum": 0.9,
+    "weight_decay": 1e-4,
+    "epoch_size": 1,
+    "pretrained_epoch_size": 90,
+    "buffer_size": 1000,
+    "image_height": 224,
+    "image_width": 224,
+    "data_load_mode": "mindata",
+    "save_checkpoint": True,
+    "save_checkpoint_epochs": 1,
+    "keep_checkpoint_max": 50,
+    "save_checkpoint_path": "./",
+    "warmup_epochs": 0,
+    "lr_decay_mode": "cosine",
+    "use_label_smooth": True,
+    "label_smooth_factor": 0.1,
+    "lr_init": 0,
+    "lr_max": 0.005,
+})
+
+dataset_path = "/dataset/workspace/mindspore_dataset/cifar-10-batches-bin/"
+
+
+@pytest.mark.level1
+@pytest.mark.platform_arm_ascend_training
+@pytest.mark.platform_x86_ascend_training
+@pytest.mark.env_onecard
+def train_on_ascend():
+    set_seed(1)
+    context.set_context(mode=context.GRAPH_MODE, device_target="Ascend")
+    config = config_quant
+    print("training configure: {}".format(config))
+    epoch_size = config.epoch_size
+
+    # define network
+    net = resnet50_quant(class_num=config.class_num)
+    net.set_train(True)
+
+    # define loss
+    if not config.use_label_smooth:
+        config.label_smooth_factor = 0.0
+    loss = CrossEntropy(
+        smooth_factor=config.label_smooth_factor, num_classes=config.class_num)
+    #loss_scale = FixedLossScaleManager(config.loss_scale, drop_overflow_update=False)
+
+    # define dataset
+    dataset = create_dataset(dataset_path=dataset_path,
+                             config=config,
+                             repeat_num=1,
+                             batch_size=config.batch_size)
+    step_size = dataset.get_dataset_size()
+
+    # convert fusion network to quantization aware network
+    net = quant.convert_quant_network(net,
+                                      bn_fold=True,
+                                      per_channel=[True, False],
+                                      symmetric=[True, False])
+
+    # get learning rate
+    lr = Tensor(get_lr(lr_init=config.lr_init,
+                       lr_end=0.0,
+                       lr_max=config.lr_max,
+                       warmup_epochs=config.warmup_epochs,
+                       total_epochs=config.epoch_size,
+                       steps_per_epoch=step_size,
+                       lr_decay_mode='cosine'))
+
+    # define optimization
+    opt = Momentum(filter(lambda x: x.requires_grad, net.get_parameters()), lr, config.momentum,
+                   config.weight_decay, config.loss_scale)
+
+    # define model
+    #model = Model(net, loss_fn=loss, optimizer=opt, loss_scale_manager=loss_scale, metrics={'acc'})
+    model = Model(net, loss_fn=loss, optimizer=opt)
+
+    print("============== Starting Training ==============")
+    monitor = Monitor(lr_init=lr.asnumpy(),
+                      step_threshold=config.step_threshold)
+
+    callbacks = [monitor]
+    model.train(epoch_size, dataset, callbacks=callbacks,
+                dataset_sink_mode=False)
+    print("============== End Training ==============")
+
+    expect_avg_step_loss = 2.40
+    avg_step_loss = np.mean(np.array(monitor.losses))
+
+    print("average step loss:{}".format(avg_step_loss))
+    assert avg_step_loss < expect_avg_step_loss
+
+
+if __name__ == '__main__':
+    train_on_ascend()

tests/st/quantization/resnet50_quant/utils.py

@@ -0,0 +1,105 @@
+# Copyright 2020 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.
+# ============================================================================
+"""Resnet50 utils"""
+
+import time
+import numpy as np
+
+from mindspore.train.callback import Callback
+from mindspore import Tensor
+from mindspore import nn
+from mindspore.nn.loss.loss import _Loss
+from mindspore.ops import operations as P
+from mindspore.ops import functional as F
+from mindspore.common import dtype as mstype
+
+
+class Monitor(Callback):
+    """
+    Monitor loss and time.
+
+    Args:
+        lr_init (numpy array): train lr
+
+    Returns:
+        None
+
+    Examples:
+        >>> Monitor(100,lr_init=Tensor([0.05]*100).asnumpy())
+    """
+
+    def __init__(self, lr_init=None, step_threshold=10):
+        super(Monitor, self).__init__()
+        self.lr_init = lr_init
+        self.lr_init_len = len(lr_init)
+        self.step_threshold = step_threshold
+
+    def epoch_begin(self, run_context):
+        self.losses = []
+        self.epoch_time = time.time()
+
+    def epoch_end(self, run_context):
+        cb_params = run_context.original_args()
+
+        epoch_mseconds = (time.time() - self.epoch_time) * 1000
+        per_step_mseconds = epoch_mseconds / cb_params.batch_num
+        print("epoch time: {:5.3f}, per step time: {:5.3f}, avg loss: {:8.6f}".format(epoch_mseconds,
+                                                                                      per_step_mseconds,
+                                                                                      np.mean(self.losses)))
+        self.epoch_mseconds = epoch_mseconds
+
+    def step_begin(self, run_context):
+        self.step_time = time.time()
+
+    def step_end(self, run_context):
+        cb_params = run_context.original_args()
+        step_mseconds = (time.time() - self.step_time) * 1000
+        step_loss = cb_params.net_outputs
+
+        if isinstance(step_loss, (tuple, list)) and isinstance(step_loss[0], Tensor):
+            step_loss = step_loss[0]
+        if isinstance(step_loss, Tensor):
+            step_loss = np.mean(step_loss.asnumpy())
+
+        self.losses.append(step_loss)
+        cur_step_in_epoch = (cb_params.cur_step_num - 1) % cb_params.batch_num
+
+        print("epoch: [{:3d}/{:3d}], step:[{:5d}/{:5d}], loss:[{:8.6f}/{:8.6f}], time:[{:5.3f}], lr:[{:5.5f}]".format(
+            cb_params.cur_epoch_num, cb_params.epoch_num, cur_step_in_epoch +
+            1, cb_params.batch_num, step_loss,
+            np.mean(self.losses), step_mseconds, self.lr_init[cb_params.cur_step_num - 1]))
+
+        if cb_params.cur_step_num == self.step_threshold:
+            run_context.request_stop()
+
+
+class CrossEntropy(_Loss):
+    """the redefined loss function with SoftmaxCrossEntropyWithLogits"""
+
+    def __init__(self, smooth_factor=0, num_classes=1001):
+        super(CrossEntropy, self).__init__()
+        self.onehot = P.OneHot()
+        self.on_value = Tensor(1.0 - smooth_factor, mstype.float32)
+        self.off_value = Tensor(1.0 * smooth_factor /
+                                (num_classes - 1), mstype.float32)
+        self.ce = nn.SoftmaxCrossEntropyWithLogits()
+        self.mean = P.ReduceMean(False)
+
+    def construct(self, logit, label):
+        one_hot_label = self.onehot(label, F.shape(
+            logit)[1], self.on_value, self.off_value)
+        loss = self.ce(logit, one_hot_label)
+        loss = self.mean(loss, 0)
+        return loss