gnu: python-pyro-ppl: Simplify inputs.
* gnu/packages/machine-learning.scm (python-pyro-ppl)[native-inputs]: Remove
ninja, jupyter, python-black, python-flake8, python-graphviz, python-isort,
python-lap, python-matplotlib, python-mypy, python-nbformat, python-nbsphinx,
python-nbstripout, python-nbval, python-pandas, python-pillow,
python-pypandoc, python-pytest, python-pytest-cov, python-pytest-xdist,
python-scikit-learn, python-scipy, python-seaborn, python-sphinx,
python-sphinx-rtd-theme, python-torchvision, python-visdom, python-wget,
python-yapf.
Change-Id: Id7a413fdbdd8a808dffb4804c8a7f04bf2c31bbc
ed882ad668