如何解决二进制分类的损失不会减少
我正在尝试实现二进制分类。我有100K(3通道,预先调整大小为224 x 224px)图像数据集,我正在尝试训练模型,以确保图片是否可以正常工作。我是具有统计学背景的数据工程师,因此我正在像过去5-10天那样研究模型。我曾尝试根据建议实施解决方案,但不幸的是损失并没有减少。
这是使用PyTorch Lightning实现的类,
from .dataset import CloudDataset
from .split import DatasetSplit
from pytorch_lightning import LightningModule
from pytorch_lightning.metrics import Accuracy
from torch import stack
from torch.nn import BCEWithLogitsLoss,Conv2d,Dropout,Linear,MaxPool2d,ReLU
from torch.optim import Adam
from torch.utils.data import DataLoader
from torch.utils.data.dataloader import default_collate
from torchvision.transforms import ToTensor
from util import logger
from util.config import config
class ClassifyModel(LightningModule):
def __init__(self):
super(ClassifyModel,self).__init__()
# custom dataset split class
ds = DatasetSplit(config.s3.bucket,config.train.ratio)
# split records for train,validation and test
self._train_itr,self._valid_itr,self._test_itr = ds.split()
self.conv1 = Conv2d(3,32,3,padding=1)
self.conv2 = Conv2d(32,64,padding=1)
self.conv3 = Conv2d(64,padding=1)
self.pool = MaxPool2d(2,2)
self.fc1 = Linear(7 * 28 * 64,512)
self.fc2 = Linear(512,16)
self.fc3 = Linear(16,4)
self.fc4 = Linear(4,1)
self.dropout = Dropout(0.25)
self.relu = ReLU(inplace=True)
self.accuracy = Accuracy()
def forward(self,x):
# comments are shape before execution
# [32,224,224]
x = self.pool(self.relu(self.conv1(x)))
# [32,112,112]
x = self.pool(self.relu(self.conv2(x)))
# [32,56,56]
x = self.pool(self.relu(self.conv3(x)))
# [32,28,28]
x = self.pool(self.relu(self.conv3(x)))
# [32,14,14]
x = self.dropout(x)
# [32,14]
x = x.view(-1,7 * 28 * 64)
# [32,12544]
x = self.relu(self.fc1(x))
# [32,512]
x = self.relu(self.fc2(x))
# [32,16]
x = self.relu(self.fc3(x))
# [32,4]
x = self.dropout(self.fc4(x))
# [32,1]
x = x.squeeze(1)
# [32]
return x
def configure_optimizers(self):
return Adam(self.parameters(),lr=0.001)
def training_step(self,batch,batch_idx):
image,target = batch
target = target.float()
output = self.forward(image)
loss = BCEWithLogitsLoss()
output = loss(output,target)
logits = self(image)
self.accuracy(logits,target)
return {'loss': output}
def validation_step(self,target)
return {'val_loss': output}
def collate_fn(self,batch):
batch = list(filter(lambda x: x is not None,batch))
return default_collate(batch)
def train_dataloader(self):
transform = ToTensor()
workers = 0 if config.train.test else config.train.workers
# custom data set class that read files from s3
cds = CloudDataset(config.s3.bucket,self._train_itr,transform)
return DataLoader(
dataset=cds,batch_size=32,shuffle=True,num_workers=workers,collate_fn=self.collate_fn,)
def val_dataloader(self):
transform = ToTensor()
workers = 0 if config.train.test else config.train.workers
# custom data set class that read files from s3
cds = CloudDataset(config.s3.bucket,)
def test_dataloader(self):
transform = ToTensor()
workers = 0 if config.train.test else config.train.workers
# custom data set class that read files from s3
cds = CloudDataset(config.s3.bucket,self._test_itr,)
def validation_epoch_end(self,outputs):
avg_loss = stack([x['val_loss'] for x in outputs]).mean()
logger.info(f'Validation loss is {avg_loss}')
def training_epoch_end(self,outs):
accuracy = self.accuracy.compute()
logger.info(f'Training accuracy is {accuracy}')
这是自定义日志输出,
epoch 0
Validation loss is 0.5988735556602478
Training accuracy is 0.4441356360912323
epoch 1
Validation loss is 0.6406065225601196
Training accuracy is 0.4441356360912323
epoch 2
Validation loss is 0.621654748916626
Training accuracy is 0.443579763174057
epoch 3
Validation loss is 0.5089989304542542
Training accuracy is 0.4580322504043579
epoch 4
Validation loss is 0.5484663248062134
Training accuracy is 0.4886047840118408
epoch 5
Validation loss is 0.5552918314933777
Training accuracy is 0.6142301559448242
epoch 6
Validation loss is 0.661466121673584
Training accuracy is 0.625903308391571
问题可能与优化程序或损失函数有关,但我不知道。
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。