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'''Virtual datasets: The 'Eiger' use case
import h5py
import numpy as np
files = ['1.h5', '2.h5', '3.h5', '4.h5', '5.h5']
entry_key = 'data' # where the data is inside of the source files.
sh = h5py.File(files[0], 'r')[entry_key].shape # get the first ones shape.
layout = h5py.VirtualLayout(shape=(len(files) * sh[0], ) + sh[1:], dtype=np.float64)
M_start = 0
for i, filename in enumerate(files):
M_end = M_start + sh[0]
vsource = h5py.VirtualSource(filename, entry_key, shape=sh)
layout[M_start:M_end:1, :, :] = vsource
M_start = M_end
with h5py.File("eiger_vds.h5", 'w', libver='latest') as f:
f.create_virtual_dataset('data', layout, fillvalue=0)