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An easy-to-use tool for training Pytorch deep learning models

Project description

DeepEpochs

Pytorch深度学习模型训练工具。

安装

pip install deepepochs

使用

数据要求

  • 训练集、验证集和测试集是torch.utils.data.Dataloader对象
  • Dataloaer中每个mini-batch数据是一个tuplelist,其中最后一个是标签
    • 如果数据不包含标签,则请将最后一项置为None

指标计算

  • 每个指标是一个函数
    • 它有两个参数,分别为模型的预测结果和标签
    • 返回值为当前mini-batch上的指标值

常规训练流程应用示例

from deepepochs import Trainer, CheckCallback, rename, EpochTask
import torch
from torch import nn
from torch.nn import functional as F
from torchvision.datasets import MNIST
from torchvision import transforms
from torch.utils.data import DataLoader, random_split
from torchmetrics import functional as MF

# datasets
data_dir = './dataset'
transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((0.1307,), (0.3081,))])
mnist_full = MNIST(data_dir, train=True, transform=transform, download=True)
train_ds, val_ds, _ = random_split(mnist_full, [5000, 5000, 50000])
test_ds = MNIST(data_dir, train=False, transform=transform, download=True)

# dataloaders
train_dl = DataLoader(train_ds, batch_size=32)
val_dl = DataLoader(val_ds, batch_size=32)
test_dl = DataLoader(test_ds, batch_size=32)

# pytorch model
channels, width, height = (1, 28, 28)
model = nn.Sequential(
    nn.Flatten(),
    nn.Linear(channels * width * height, 64),
    nn.ReLU(),
    nn.Dropout(0.1),
    nn.Linear(64, 64),
    nn.ReLU(),
    nn.Dropout(0.1),
    nn.Linear(64, 10)
)

def acc(preds, targets):
    return MF.accuracy(preds, targets, task='multiclass', num_classes=10)

@rename('')
def multi_metrics(preds, targets):
    return {
        'p': MF.precision(preds, targets, task='multiclass', num_classes=10),
        'r': MF.recall(preds, targets, task='multiclass', num_classes=10)
        }


checker = CheckCallback('loss', on_stage='val', mode='min', patience=2)
opt = torch.optim.Adam(model.parameters(), lr=2e-4)

trainer = Trainer(model, F.cross_entropy, opt=opt, epochs=100, callbacks=checker, metrics=[acc])

# 应用示例1:
progress = trainer.fit(train_dl, val_dl, metrics=[multi_metrics], resume=True)
test_rst = trainer.test(test_dl)

# 应用示例2:
# t1 = EpochTask(train_dl, metrics=[acc])
# t2 = EpochTask(val_dl, metrics=[multi_metrics], do_loss=True)
# progress = trainer.fit(train_tasks=t1, val_tasks=t2)
# test_rst = trainer.test(tasks=t2)

# 应用示例3:
# t1 = EpochTask(train_dl, metrics=[acc])
# t2 = EpochTask(val_dl, metrics=[acc, multi_metrics], do_loss=True)
# progress = trainer.fit(train_dl, val_tasks=[t1, t2])
# test_rst = trainer.test(tasks=[t1, t2])

非常规训练流程

  • 方法1:
    • 第1步:继承deepepochs.Callback类,定制满足需要的Callback
    • 第2步:使用deepepochs.Trainer训练模型,将定制的Callback对象作为Trainercallbacks参数
  • 方法2:
    • 第1步:继承deepepochs.TrainerBase类,定制满足需要的Trainer,实现train_stepval_steptest_stepevaluate_step方法
      • 参数分别为:batch_x, batch_y, **kwargs
      • 返回值为字典:key为指标名称,value为DeepEpochs.PatchBase子类对象,可用的Patch有
        • ValuePatch: 根据每个batch指标均值(提前计算好)和batch_size,累积计算Epoch指标均值
        • TensorPatch: 保存每个batch模型预测输出及标签,根据指定指标函数累积计算Epoch指标均值
        • MeanPatch: 保存每个batch指标均值,根据指定指标函数累积计算Epoch指标均值
        • ConfusionPatch:累积计算基于混淆矩阵的指标
    • 第2步:调用定制Trainer训练模型。
  • 方法3:
    • 第1步:继承deepepochs.EpochTask类,在其中定义steptrain_stepval_steptest_stepevaluate_step方法
      • 它们的定义方式与Trainer.train_stepTrainer.evaluate_step相同
      • step方法优先级最高,即可用于训练也可用于验证和测试(定义了step方法,其他方法就会失效)
      • val_steptest_step优先级高于evaluate_step方法
      • EpochTask中的*_step方法优先级高于Trainer中的*_step方法
    • 第2步:使用将新的EpochTask任务进行训练。
      • EpochTask对象作为Trainer.fittrain_tasksval_tasks的参数值,或者Trainer.test方法中tasks的参数值

数据流图

https://github.com/hitlic/deepepochs/blob/main/imgs/data_flow.png

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