Error when creating dataset with h5py python

Question

I'm trying to run code from here in Google Colab code I run

But on second line of

hf = h5py.File('data_1.h5', 'w')

hf.create_dataset('dataset_1', data=x) 

I get following error:

    116         else:
    117             dtype = numpy.dtype(dtype)
    --> 118         tid = h5t.py_create(dtype, logical=1)    
    119     
    120     # Legacy
    h5py/h5t.pyx in h5py.h5t.py_create()
    h5py/h5t.pyx in h5py.h5t.py_create()
    h5py/h5t.pyx in h5py.h5t.py_create()

    TypeError: Object dtype dtype('O') has no native HDF5 equivalent

Why does it appear? What's the root cause? Any ideas on how to fix it?

What I see in x is

    [[array([[[255., 255., 255.],
            [255., 255., 255.],
            [255., 255., 255.],
            ...,
            [255., 255., 255.],
            [255., 255., 255.],
            [255., 255., 255.]],
    
           [[255., 255., 255.],
            [255., 255., 255.],
            [255., 255., 255.],
            .......

Answer 1

The fix for code is to keep the x like this:

hf.create_dataset('dataset_1', (len(x),), dtype=dt)
hf['dataset_1'][...] = x