import os import pandas as pd from tsfresh import extract_features, select_features from tsfresh.utilities.dataframe_functions import impute # 定义文件夹路径 train_folder_path = 'IEEE PHM 2012/Learning_set/Bearing1_1' test_folder_path = 'IEEE PHM 2012/Test_set/Bearing1_3' # 定义文件名前缀 file_prefix = 'acc_' # 定义文件扩展名 file_ext = '.csv' # 定义数据集列表 train_data = [] test_data = [] # 循环读取训练集文件 for i in range(1, 7): train_file_path = os.path.join(train_folder_path, file_prefix + '{:05d}'.format(i) + file_ext) train_data.append(pd.read_csv(train_file_path, header=None)) # 循环读取测试集文件 for i in range(1, 5): test_file_path = os.path.join(test_folder_path, file_prefix + '{:05d}'.format(i) + file_ext) test_data.append(pd.read_csv(test_file_path, header=None)) train_features = [] test_features = [] # 提取训练集特征 for i in range(len(train_data)): features = extract_features(train_data[i], column_id=0, column_sort=1) train_features.append(features) # 提取测试集特征 for i in range(len(test_data)): features = extract_features(test_data[i], column_id=0, column_sort=1) test_features.append(features) # 将特征转化为pandas DataFrame并保存到csv文件中 train_features_df = pd.concat(train_features) train_features_df.to_csv('train_features.csv', index=False) test_features_df = pd.concat(test_features) test_features_df.to_csv('test_features.csv', index=False)以上代码有何问题
时间: 2023-06-18 16:03:19 浏览: 131
import pandas as pd.docx
以上代码可能会出现以下问题:
1. 缺少必要的库引用语句。需要添加以下语句:
```
from tsfresh import extract_features
from tsfresh.utilities.dataframe_functions import impute
```
2. `train_data` 和 `test_data` 列表中的元素都是 pandas DataFrame,因此在调用 `extract_features` 函数时,需要将 DataFrame 作为函数的第一个参数传递,而不是作为文件路径传递。
```
features = extract_features(train_data[i], column_id=0, column_sort=1)
```
3. 在将特征转换为 pandas DataFrame 时,需要使用 `pd.concat` 函数将所有特征连接起来。同时,需要将 `index` 参数设置为 False,以避免生成额外的索引列。
```
train_features_df = pd.concat(train_features)
train_features_df.to_csv('train_features.csv', index=False)
test_features_df = pd.concat(test_features)
test_features_df.to_csv('test_features.csv', index=False)
```
除此之外,还需要确保文件路径的正确性和文件格式的一致性,以及在提取特征时选择合适的 `column_id` 和 `column_sort` 参数。
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