TwoPhotonSeries data not loading for recent dataset

[bendichter]

https://neurosift.app/?p=/nwb&url=https://api.dandiarchive.org/api/assets/879c8d7e-3735-467b-8c77-3464532fafbc/download/&dandisetId=001188&dandisetVersion=0.240912.1925

[magland]

It seems that the data has shape (0,0,0). Any idea why?

import remfile
import h5py
url = 'https://api.dandiarchive.org/api/assets/879c8d7e-3735-467b-8c77-3464532fafbc/download/'

# Load the remote file
remf = remfile.File(url)
f = h5py.File(remfile.File(url), 'r')

# load the neurodata object
X = f['/acquisition/TwoPhotonSeries']

print(X['data'].shape)

# output: (0, 0, 0)

[magland]

I think it's because the format is "external" => shape of data = (0, 0, 0)

[bendichter]

ah, ok. This is something we enabled early in NWB, where data contributors could store 2p data in external TIFF files, but this isn't something that's fully supported by DANDI. DANDI prefers data to be stored in the NWB files so it can benefit from lossless compression and chunking. I think we should add a best practice to prevent this type of data from being contributed in the future.