In a few places (e.g., 3rd cell [here](https://github.com/Project-MONAI/Tutorials/blob/master/nifti_read_example.ipynb)), we have: ``` root_dir = tempfile.mkdtemp if directory is None else directory ``` which is missing the brackets: ``` root_dir = tempfile.mkdtemp() if directory is None else directory ``` Might be worth grepping and replacing all `mkdtemp[space]` with `mkdtemp()[space]`.
