“ IsADirectoryError：[Errno 21]是目录：”它是一个文件

Question

我已经将数据分为测试和培训集，并放入了不同的文件夹。现在，我需要加载患者数据。每个病人有8张图像。

def load_dataset(root_dir, split):
"""
load the data set numpy arrays saved by the preprocessing script
:param root_dir: path to input data
:param split: defines whether to load the training or test set
:return: data: dictionary containing one dictionary ({'data', 'seg', 'pid'}) per patient
"""
in_dir = os.path.join(root_dir, split)
data_paths = [os.path.join(in_dir, f) for f in os.listdir(in_dir)]
data_and_seg_arr = [np.load(ii, mmap_mode='r') for ii in data_paths]
pids = [ii.split('/')[-1].split('.')[0] for ii in data_paths]
data = OrderedDict()
for ix, pid in enumerate(pids):
    data[pid] = {'data': data_and_seg_arr[ix][..., 0], 'seg': data_and_seg_arr[ix][..., 1], 'pid': pid}
return data

但是，错误提示：

File "/home/zhe/Research/Seg/heart_seg/data_loader.py", line 61, in load_dataset
data_and_seg_arr = [np.load(ii, mmap_mode='r') for ii in data_paths]
File "/home/zhe/Research/Seg/heart_seg/data_loader.py", line 61, in <listcomp>
data_and_seg_arr = [np.load(ii, mmap_mode='r') for ii in data_paths]
File "/home/zhe/anaconda3/envs/tf_env/lib/python3.6/site-packages/numpy/lib/npyio.py", line 372, in load
fid = open(file, "rb")
IsADirectoryError: [Errno 21] Is a directory: './data/preprocessed_data/train/Patient009969'

它已经是文件名，而不是目录。谢谢！

Answer 1

你的路径中有文件和目录吗？os.listdir将列出文件和目录，因此当您尝试使用np.load它打开目录时会出现该错误。您可以仅过滤文件以避免错误：

data_paths = [os.path.join(in_dir, f) for f in os.listdir(in_dir)]
data_paths = [i for i in data_paths if os.path.isfile(i)]

或者全部在一行中：

data_paths = [i for i in (os.path.join(in_dir, f) for f in os.listdir(in_dir)) if os.path.isfile(i)]

Answer 2

看来这./data/preprocessed_data/train/Patient009969是目录，而不是文件。

os.listdir() 返回文件和目录。

也许尝试使用os.walk()代替。它分别处理文件和目录，并可以在子目录内递归以迭代方式查找更多文件：

data_paths = [os.path.join(pth, f) 
    for pth, dirs, files in os.walk(in_dir) for f in files]