Fixed #1112 Migrate to New NumPy Random Number Generator (RNG) API

[seanlaw]

See issue #1112

This is a second attempt that follows failed PR #1131

Pull Request Checklist

Below is a simple checklist but please do not hesitate to ask for assistance!

• Fork, clone, and checkout the newest version of the code
• Create a new branch
• Make necessary code changes
• Install black (i.e., python -m pip install black or conda install -c conda-forge black)
• Install flake8 (i.e., python -m pip install flake8 or conda install -c conda-forge flake8)
• Install pytest-cov (i.e., python -m pip install pytest-cov or conda install -c conda-forge pytest-cov)
• Run black --exclude=".*\.ipynb" --extend-exclude=".venv" --diff ./ in the root stumpy directory
• Run flake8 --extend-exclude=.venv ./ in the root stumpy directory
• Run ./setup.sh dev && ./test.sh in the root stumpy directory
• Reference a Github issue (and create one if one doesn't already exist)

To Do List

1. Search for np.random
2. Replace np.random.rand(x) with rng.RNG.random(x)
3. Replace np.random.rand(x*y).reshape(x,y) with rng.RNG.random(size=(x, y))
4. Replace np.random.uniform(x, y, [z]) with rng.RNG.uniform(x, y, size=z)
5. Replace np.random.permutation([x, y, z]) with rng.RNG.permutation([x, y, z])
6. Replace np.random.randint(x, y, z) with rng.RNG.integers(x, y, z)
7. Replace np.random.choice([x, y], l, replace=True) with rng.RNG.choice([x, y], l, replace=True)
8. Replace np.random.normal(size=x) with rng.RNG.normal(size=x)
9. Replace all np.random from docstrings, README, tutorials, etc

[gitnotebooks]

Review these changes at https://app.gitnotebooks.com/stumpy-dev/stumpy/pull/1147

[seanlaw]

@NimaSarajpoor I've created a newstumpy/rng.py module that will manage our random number usage and tested the numpy.random migration on test_core.py as an initial trial run. Would you mind taking a look and providing any feedback before I do the same thing on the other tests?

I will be adding a tests/test_rng.py next

[NimaSarajpoor]

@seanlaw Please allow me some time to take a look. Will provide an update in a couple of days.