NamedTemporaryFile function under windows

Hi,
I tried to run the MUV inotebook and got some errors with
> [Errno 13] Permission denied

when trying to read or write from temp file.

I found the error online with the solution
[http://zachmoshe.com/2017/04/03/pickling-keras-models.html](url)
And adding delete=False to the 4 instances of NamedTemporaryFile in the file deepchem\hyper\__init__.py from
`tempfile.NamedTemporaryFile()` to
`tempfile.NamedTemporaryFile(delete=False)`
solved the problem.

However I don't know if this option will break the module to run on Linux, and also if this is desirable (default is to delete the file)
See [https://docs.python.org/3.5/library/tempfile.html#tempfile.NamedTemporaryFile](url) for the doc on NamedTemporaryFile and the windows/Linux behaviour