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129 lines
4.8 KiB
129 lines
4.8 KiB
# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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import time
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import numpy as np
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from mindspore import Tensor
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from mindspore import nn
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from mindspore.ops import operations as P
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from mindspore.ops import functional as F
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from mindspore.common import dtype as mstype
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from mindspore.nn.loss.loss import _Loss
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from mindspore.train.callback import Callback
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from mindspore.train.serialization import load_checkpoint, load_param_into_net
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from src.mobilenetV2 import MobileNetV2Backbone, MobileNetV2Head, mobilenet_v2
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class CrossEntropyWithLabelSmooth(_Loss):
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"""
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CrossEntropyWith LabelSmooth.
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Args:
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smooth_factor (float): smooth factor. Default is 0.
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num_classes (int): number of classes. Default is 1000.
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Returns:
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None.
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Examples:
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>>> CrossEntropyWithLabelSmooth(smooth_factor=0., num_classes=1000)
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"""
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def __init__(self, smooth_factor=0., num_classes=1000):
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super(CrossEntropyWithLabelSmooth, self).__init__()
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self.onehot = P.OneHot()
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self.on_value = Tensor(1.0 - smooth_factor, mstype.float32)
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self.off_value = Tensor(1.0 * smooth_factor /
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(num_classes - 1), mstype.float32)
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self.ce = nn.SoftmaxCrossEntropyWithLogits()
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self.mean = P.ReduceMean(False)
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self.cast = P.Cast()
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def construct(self, logit, label):
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one_hot_label = self.onehot(self.cast(label, mstype.int32), F.shape(logit)[1],
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self.on_value, self.off_value)
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out_loss = self.ce(logit, one_hot_label)
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out_loss = self.mean(out_loss, 0)
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return out_loss
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class Monitor(Callback):
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"""
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Monitor loss and time.
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Args:
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lr_init (numpy array): train lr
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Returns:
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None
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Examples:
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>>> Monitor(100,lr_init=Tensor([0.05]*100).asnumpy())
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"""
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def __init__(self, lr_init=None):
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super(Monitor, self).__init__()
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self.lr_init = lr_init
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self.lr_init_len = len(lr_init)
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def epoch_begin(self, run_context):
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self.losses = []
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self.epoch_time = time.time()
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def epoch_end(self, run_context):
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cb_params = run_context.original_args()
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epoch_mseconds = (time.time() - self.epoch_time) * 1000
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per_step_mseconds = epoch_mseconds / cb_params.batch_num
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print("epoch time: {:5.3f}, per step time: {:5.3f}, avg loss: {:5.3f}".format(epoch_mseconds,
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per_step_mseconds,
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np.mean(self.losses)))
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def step_begin(self, run_context):
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self.step_time = time.time()
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def step_end(self, run_context):
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cb_params = run_context.original_args()
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step_mseconds = (time.time() - self.step_time) * 1000
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step_loss = cb_params.net_outputs
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if isinstance(step_loss, (tuple, list)) and isinstance(step_loss[0], Tensor):
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step_loss = step_loss[0]
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if isinstance(step_loss, Tensor):
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step_loss = np.mean(step_loss.asnumpy())
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self.losses.append(step_loss)
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cur_step_in_epoch = (cb_params.cur_step_num - 1) % cb_params.batch_num
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print("epoch: [{:3d}/{:3d}], step:[{:5d}/{:5d}], loss:[{:5.3f}/{:5.3f}], time:[{:5.3f}], lr:[{:5.3f}]".format(
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cb_params.cur_epoch_num -
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1, cb_params.epoch_num, cur_step_in_epoch, cb_params.batch_num, step_loss,
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np.mean(self.losses), step_mseconds, self.lr_init[cb_params.cur_step_num - 1]))
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def load_ckpt(network, pretrain_ckpt_path, trainable=True):
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"""load checkpoint into network."""
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param_dict = load_checkpoint(pretrain_ckpt_path)
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load_param_into_net(network, param_dict)
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if not trainable:
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for param in network.get_parameters():
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param.requires_grad = False
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def define_net(config, is_training=True):
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backbone_net = MobileNetV2Backbone()
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activation = config.activation if not is_training else "None"
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head_net = MobileNetV2Head(input_channel=backbone_net.out_channels,
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num_classes=config.num_classes,
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activation=activation)
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net = mobilenet_v2(backbone_net, head_net)
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return backbone_net, head_net, net
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