improve html representation of datasets

[h-mayorquin]

Motivation

Improve the display of the data in the html representation of containers. Note that this PR is focused on datasets that were already written. For in memory representation the issue on what to do with things that are wrapped in an iterator or an DataIO subtype can be addressed in another PR I think.

How to test the behavior?

HDF5

I have been using this script

from pynwb.testing.mock.ecephys import mock_ElectricalSeries
from pynwb.testing.mock.file import mock_NWBFile
from hdmf.backends.hdf5.h5_utils import H5DataIO
from pynwb.testing.mock.ophys import mock_ImagingPlane, mock_TwoPhotonSeries

import numpy as np

data=np.random.rand(500_000, 384)
timestamps = np.arange(500_000)
data = data=H5DataIO(data=data, compression=True, chunks=True)

nwbfile = mock_NWBFile()
electrical_series = mock_ElectricalSeries(data=data, nwbfile=nwbfile, rate=None, timestamps=timestamps)

imaging_plane = mock_ImagingPlane(grid_spacing=[1.0, 1.0], nwbfile=nwbfile)


data = H5DataIO(data=np.random.rand(2, 2, 2), compression=True, chunks=True)
two_photon_series = mock_TwoPhotonSeries(name="TwoPhotonSeries", imaging_plane=imaging_plane, data=data, nwbfile=nwbfile)


# Write to file
from pynwb import NWBHDF5IO
with NWBHDF5IO('ecephys_tutorial.nwb', 'w') as io:
    io.write(nwbfile)



from pynwb import NWBHDF5IO

io = NWBHDF5IO('ecephys_tutorial.nwb', 'r')
nwbfile = io.read()
nwbfile

Zarr

from numcodecs import Blosc
from hdmf_zarr import ZarrDataIO
import numpy as np
from pynwb.testing.mock.file import mock_NWBFile
from hdmf_zarr.nwb import NWBZarrIO
import os
import zarr
from numcodecs import Blosc, Delta

from pynwb.testing.mock.ecephys import mock_ElectricalSeries
filters = [Delta(dtype="i4")]

data_with_zarr_data_io = ZarrDataIO(
    data=np.arange(100000000, dtype='i4').reshape(10000, 10000),
    chunks=(1000, 1000),
    compressor=Blosc(cname='zstd', clevel=3, shuffle=Blosc.SHUFFLE),
    # filters=filters,
)

timestamps = np.arange(10000)

data = data_with_zarr_data_io

nwbfile = mock_NWBFile()
electrical_series_name = "ElectricalSeries"
rate = None
electrical_series = mock_ElectricalSeries(name=electrical_series_name, data=data, nwbfile=nwbfile, timestamps=timestamps, rate=None)


path = "zarr_test.nwb.zarr"
absolute_path = os.path.abspath(path)
with NWBZarrIO(path=path, mode="w") as io:
    io.write(nwbfile)
    
from hdmf_zarr.nwb import NWBZarrIO

path = "zarr_test.nwb.zarr"

io = NWBZarrIO(path=path, mode="r")
nwbfile = io.read()
nwbfile

Checklist

• [x] Did you update CHANGELOG.md with your changes?
• [x] Does the PR clearly describe the problem and the solution?
• [x] Have you reviewed our Contributing Guide?
• [x] Does the PR use "Fix #XXX" notation to tell GitHub to close the relevant issue numbered XXX when the PR is merged?