如何在HDF5Matrix中访问.h5文件的嵌套键路径？

I'm trying to load a .h5 file using the HDF5Matrix documentation with this code:

test_images = HDF5Matrix(train_path+train_file,'images')

But I get this error:

KeyError: "Unable to open object (object 'images' doesn't exist)"

I know this is because the data is nested, and I normally access it using dictionary-style bracket notation with h5py like this:

with h5py.File(train_path+train_file, 'r') as hf: 
    train_images = hf['train']['images'][:]

My question is: Can I access nested key paths using HDF5Matrix?

Absolutely! You can access nested HDF5 groups and datasets with HDF5Matrix—you just need to pass the full path to the dataset using forward slashes (/) instead of the nested dictionary syntax from h5py.

For your specific case, instead of just passing 'images', you'll use the full path 'train/images' which maps directly to hf['train']['images'] in your h5py code. Here's the corrected line:

test_images = HDF5Matrix(train_path+train_file, 'train/images')

This works for any level of nesting too. If your dataset was deeper, like in hf['group1']['group2']['images'], you'd just use the path 'group1/group2/images' as the second argument to HDF5Matrix.

The key thing to remember is that HDF5Matrix accepts the full dataset path as a string, using slashes to traverse groups, rather than the bracket-based chaining you use with h5py objects.

内容的提问来源于stack exchange，提问作者virtualdvid