ilastik / lazyflow / 619

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Pull #328

travis-ci

Fix scikit-learn classifier HDF5 serialization

From https://h5py.readthedocs.io/en/stable/strings.html#how-to-store-raw-binary-data:

> If you have a non-text blob in a Python byte string (as opposed to
> ASCII or UTF-8 encoded text, which is fine), you should wrap it in a
> void type for storage. This will map to the HDF5 OPAQUE datatype, and
> will prevent your blob from getting mangled by the string machinery.
>
> Here’s an example of how to store binary data in an attribute, and
> then recover it:
>
>     binary_blob = b"Hello\x00Hello\x00"
>     dset.attrs["attribute_name"] = np.void(binary_blob)
>     out = dset.attrs["attribute_name"]
>     binary_blob = out.tostring()

Closes https://github.com/ilastik/ilastik/issues/1997.

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