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zyq
318
utils.py
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318
utils.py
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import os
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import numpy
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import torch.nn as nn
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import torch
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import torch.utils.data as tud
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import preprocess
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import evaluation
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from loguru import logger
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import time
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from tqdm import tqdm
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def create_dataloader(dataset_name: str, input_size: int = 1, output_size: int = 1, step: int = 1, batch_size: int = 1,
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time_index: bool = True, del_column_name: bool = True,
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preprocess_name: str = "standardization") -> (tud.DataLoader, tud.DataLoader):
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"""
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针对一个数据集，构建Dataloader
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:param dataset_name: 数据集名称
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:param input_size: 输入数据长度
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:param output_size: 输出数据长度
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:param step: 截取数据的窗口移动间隔
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:param batch_size: batch的大小
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:param time_index: True为第一列是时间戳，False为不
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:param del_column_name: 文件中第一行为列名时，使用True
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:param preprocess_name: 预处理方法
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:return: 训练数据与测试数据
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"""
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ds = eval(f"preprocess.{preprocess_name}.MyDataset")(name=dataset_name.replace("/", "-"),
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train_path=f"./dataset/{dataset_name}/train.csv",
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test_path=f"./dataset/{dataset_name}/test.csv",
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input_size=input_size, output_size=output_size,
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step=step, time_index=time_index,
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del_column_name=del_column_name)
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normal_dl = tud.DataLoader(dataset=ds, batch_size=batch_size, shuffle=True)
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ds.mode = "test"
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attack_dl = tud.DataLoader(dataset=ds, batch_size=batch_size, shuffle=False)
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return normal_dl, attack_dl
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def create_all_dataloader(datasets: [str], input_size: int = 1, output_size: int = 1, step: int = 1,
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batch_size: int = 1, time_index: bool = True, del_column_name: bool = True,
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preprocess_name: str = "standardization") -> [{}]:
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"""
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对所有数据集构建dataloader
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:param datasets: 数据集列表
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:param input_size: 输入数据长度
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:param output_size: 输出数据长度
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:param step: 截取数据的窗口移动间隔
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:param batch_size: batch的大小
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:param time_index: True为第一列是时间戳，False为不。
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:param del_column_name: 文件中第一行为列名时，使用True
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:param preprocess_name: 预处理方法
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:return: 所有数据集的dataloader构建结果
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"""
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all_dataloader = []
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for dataset_name in datasets:
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logger.info(f'开始建立 dataloader {dataset_name}')
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if "train.csv" in os.listdir(f"./dataset/{dataset_name}"):
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normal_dl, attack_dl = create_dataloader(dataset_name=dataset_name, input_size=input_size,
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output_size=output_size, step=step, batch_size=batch_size,
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time_index=time_index, del_column_name=del_column_name,
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preprocess_name=preprocess_name)
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all_dataloader.append([{
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'dataset_name': dataset_name,
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'normal': normal_dl,
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'attack': attack_dl
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}])
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else:
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all_sub_dataloader = []
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for sub_dataset_dir in os.listdir(f"./dataset/{dataset_name}"):
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sub_dataset_name = f"{dataset_name}/{sub_dataset_dir}"
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normal_dl, attack_dl = create_dataloader(dataset_name=sub_dataset_name, input_size=input_size,
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output_size=output_size, step=step, batch_size=batch_size,
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del_time=del_time, del_column_name=del_column_name)
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all_sub_dataloader.append({
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'dataset_name': sub_dataset_name.replace("/", "-"),
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'normal': normal_dl,
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'attack': attack_dl
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})
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all_dataloader.append(all_sub_dataloader)
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logger.info(f'完成建立 dataloader {dataset_name}')
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return all_dataloader
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class EvaluationScore:
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def __init__(self, evaluations: [str], attack=1):
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"""
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用于自动划分阈值并进行批量评估
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:param evaluations: 使用的评估方法名称（需在evaluation文件夹中进行定义）
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:param attack: 异常的标签，0 or 1
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"""
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self.time = 0
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self.f1 = 0
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self.f1_pa = 0
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self.f_tad = 0
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self.attack = attack
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self.normal = 1 - attack
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self._total_y_loss = None
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self._total_label = None
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self._total_pred_label = None
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self.true_pred_df = None
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self.true_pred_dict = None
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self.evaluations = evaluations
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self.scores = {}
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def add_data(self, y_loss, true_label, pred_label=None):
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"""
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添加每个batch的数据
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:param y_loss: 数据偏差
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:param true_label: 真实数据标签
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:param pred_label: 预测标签
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"""
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if pred_label is not None:
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if self._total_label is None and self._total_pred_label is None:
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self._total_label = true_label
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self._total_pred_label = pred_label
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else:
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self._total_label = torch.cat([self._total_label, true_label], dim=0)
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self._total_pred_label = torch.cat([self._total_pred_label, pred_label], dim=0)
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return
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y_loss = y_loss.view(-1).cpu().detach().numpy()
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true_label = true_label.view(-1).cpu().detach().numpy()
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if self._total_y_loss is None and self._total_label is None:
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self._total_y_loss = y_loss
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self._total_label = true_label
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return
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self._total_y_loss = numpy.concatenate((self._total_y_loss, y_loss), axis=0)
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self._total_label = numpy.concatenate((self._total_label, true_label), axis=0)
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def best_threshold(self, true_label: list, y_loss: list) -> dict:
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ret = {}
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for func_name in self.evaluations:
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threshold_max = max(y_loss)
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threshold_min = 0
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best_threshold = 0
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for _ in range(5):
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threshold_list = [threshold_max - i * (threshold_max - threshold_min) / 10 for i in range(11)]
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f1_list = []
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for threshold_one in threshold_list:
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prediction_loss = numpy.where(numpy.array(y_loss) > threshold_one, self.attack, self.normal)
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f1 = eval(f"evaluation.{func_name}.evaluate")(y_true=true_label, y_pred=prediction_loss.tolist())
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f1_list.append(f1)
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ind = f1_list.index(max(f1_list))
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best_threshold = threshold_list[ind]
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if ind == 0:
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threshold_max = threshold_list[ind]
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threshold_min = threshold_list[ind+1]
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elif ind == len(threshold_list)-1:
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threshold_max = threshold_list[ind-1]
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threshold_min = threshold_list[ind]
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else:
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threshold_max = threshold_list[ind-1]
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threshold_min = threshold_list[ind+1]
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ret[func_name] = best_threshold
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return ret
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def auto_threshold(self):
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if self._total_pred_label is not None:
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return
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self._total_y_loss[numpy.isnan(self._total_y_loss)] = 0
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self._total_y_loss = self._total_y_loss / max(self._total_y_loss)
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thresholds = self.best_threshold(
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self._total_label.reshape(-1).data.tolist(), self._total_y_loss.reshape(-1).data.tolist())
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self.true_pred_dict = {
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'true': self._total_label.squeeze().tolist()
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}
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for func_name in thresholds:
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self.true_pred_dict[func_name] = \
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numpy.where(self._total_y_loss > thresholds[func_name], self.attack, self.normal).squeeze().tolist()
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# self.true_pred_df = pandas.DataFrame(self.true_pred_dict)
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for func_name in self.true_pred_dict:
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if func_name == "true":
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continue
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self.scores[func_name] = self.get_score(func_name)
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def get_score(self, func_name):
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if self._total_pred_label is not None:
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return eval(f"evaluation.{func_name}.evaluate")(self._total_label.reshape(-1).tolist(),
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self._total_pred_label.reshape(-1).tolist())
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return eval(f"evaluation.{func_name}.evaluate")(self._total_label.reshape(-1).tolist(),
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self.true_pred_dict[f"{func_name}"])
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def __str__(self):
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res = ""
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for func_name in self.scores:
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res += f"{func_name}={self.scores[func_name]:.3f} "
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return res[:-1]
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def train_model(epoch: int, optimizer: torch.optim, dataloader: tud.DataLoader, model: nn.Module,
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device: str = "cpu") -> (nn.Module, str):
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"""
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训练模型
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:param epoch: 当前训练轮数
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:param optimizer: 优化器
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:param dataloader: 数据集
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:param model: 模型
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:param device: 训练设备使用cpu还是gpu
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:return: 训练完成的模型；训练完成需要输出的信息
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"""
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model.train()
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avg_loss = []
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dataloader.dataset.mode = "train"
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start_time = time.time()
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with tqdm(total=len(dataloader), ncols=150) as _tqdm:
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_tqdm.set_description(f'（进度条部分不会写进本地日志）epoch:{epoch}，训练进度')
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for data in dataloader:
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x = data[0].to(device)
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y_true = data[2].to(device)
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optimizer.zero_grad()
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loss = model.loss(x=x, y_true=y_true, epoch=epoch, device=device)
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avg_loss.append(loss)
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optimizer.step()
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_tqdm.set_postfix(loss='{:.6f}'.format(sum(avg_loss) / len(avg_loss)))
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_tqdm.update(1)
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end_time = time.time()
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info = f"epoch={epoch}, average loss={'{:.6f}'.format(sum(avg_loss) / len(avg_loss))}, " \
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f"train time={'{:.1f}'.format(end_time-start_time)}s"
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return model, info
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def test_model(dataloader: tud.DataLoader, model: nn.Module, evaluations: [str], device: str = "cpu") -> \
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(EvaluationScore, str):
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"""
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测试模型
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:param dataloader: 数据集
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:param model: 模型
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:param device: 训练设备使用cpu还是gpu
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:return: 评估分数；测试完成需要输出的信息
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"""
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es = EvaluationScore(evaluations)
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model.eval()
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dataloader.dataset.mode = "test"
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start_time = time.time()
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with tqdm(total=len(dataloader), ncols=150) as _tqdm:
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_tqdm.set_description(f'（进度条部分不会写进本地日志）测试进度')
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with torch.no_grad():
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for data in dataloader:
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x = data[0].to(device)
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y_true = data[2].to(device)
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label_true = data[1].int().to(device)
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y_loss, label_pred = model.detection(x=x, y_true=y_true, device=device)
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if label_pred is not None:
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es.add_data(y_loss=None, true_label=label_true, pred_label=label_pred)
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else:
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es.add_data(y_loss=y_loss, true_label=label_true, pred_label=None)
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_tqdm.update(1)
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end_time = time.time()
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es.auto_threshold()
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es_score = es.__str__().replace(" ", ", ")
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info = f"{es_score}, test time={'{:.1f}'.format(end_time-start_time)}s"
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return es, info
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def train_and_test_model(start_time: str, epochs: int, normal_dataloader: tud.DataLoader, attack_dataloader: tud.DataLoader,
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model: nn.Module, evaluations: [str], device: str = "cpu", lr: float = 1e-4,
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model_path: str = None, train: bool = True) -> (dict, dict):
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"""
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训练与测试
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:param start_time: 实验的开始时间。此处用于寻找存放路径。
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:param epochs: 总共训练轮数
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:param normal_dataloader: 训练数据集
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:param attack_dataloader: 测试数据集
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:param model: 模型
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:param evaluations: 评估方法
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:param device: 设备
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:param lr: 学习率
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:param model_path: 模型参数文件路径
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:param train: 是否训练，如果为否，则仅进行测试
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:return: 各个评估方法的最佳分数、各个评估方法最佳情况下的检测标签
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"""
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dataset_name = normal_dataloader.dataset.name
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optimizer = torch.optim.Adam(model.parameters(), lr=lr)
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if model_path:
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try:
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checkpoint = torch.load(model_path)
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model.load_state_dict(checkpoint['model_state_dict'])
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optimizer.load_state_dict(checkpoint['optimizer_state_dict'])
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logger.info(f"模型参数文件{model_path}加载成功")
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except:
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logger.warning(f"模型参数文件{model_path}加载失败，将训练新模型")
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logger.info(f"模型：{model.name}，数据集：{dataset_name}，设备：{device}，训练开始")
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best_score = {}
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best_detection = {}
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if train:
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logger.info(f"模式：训练并测试")
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for epoch in range(1, epochs+1):
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model, train_info = train_model(epoch=epoch, optimizer=optimizer, dataloader=normal_dataloader, model=model,
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device=device)
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es, test_info = test_model(dataloader=attack_dataloader, model=model, evaluations=evaluations,
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device=device)
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logger.info(f"{train_info}, {test_info}")
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es_score = es.__str__().replace(" ", "_")
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torch.save({
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'model_state_dict': model.state_dict(),
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'optimizer_state_dict': optimizer.state_dict()
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}, f'./records/{start_time}/model/model={model.name}_dataset={dataset_name}_epoch={epoch}_{es_score}.pth')
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for func_name in es.scores:
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if func_name not in best_score or es.scores[func_name] > best_score[func_name]:
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best_score[func_name] = es.scores[func_name]
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best_detection[func_name] = es.true_pred_dict[func_name]
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best_detection["true"] = es.true_pred_dict["true"]
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else:
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logger.info(f"模式：仅进行测试")
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es, test_info = test_model(dataloader=attack_dataloader, model=model, evaluations=evaluations, device=device)
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logger.info(test_info)
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for func_name in es.scores:
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best_score[func_name] = es.scores[func_name]
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best_detection[func_name] = es.true_pred_dict[func_name]
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best_detection["true"] = es.true_pred_dict["true"]
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return best_score, best_detection
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