[MNT] fix pre-commit failures on main

[ewth]

Cleaned up the offending items so pre-commit passes on main.

Fixes #1695

Description

This quick fix sorts out the files causing pre-commit to fail on main, so it can run again.

Checklist

• Linked issues (if existing)
• Amended changelog for large changes (and added myself there as contributor)
• Added/modified tests
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

Make sure to have fun coding!

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[ewth]

Before:

$ git checkout main
Switched to branch 'main'
Your branch is up to date with 'origin/main'.
$ git rev-parse HEAD
53a1c4168dacb0de027d946895bcc9810e86a1da
$ pre-commit run --all-files
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...............................................................Passed
check python ast.........................................................Passed
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

examples/ar.py:88:56: E226 missing whitespace around arithmetic operator
print(f"Number of parameters in network: {deepar.size()/1e3:.1f}k")
                                                       ^
examples/nbeats.py:68:53: E226 missing whitespace around arithmetic operator
print(f"Number of parameters in network: {net.size()/1e3:.1f}k")
                                                    ^
examples/stallion.py:122:53: E226 missing whitespace around arithmetic operator
print(f"Number of parameters in network: {tft.size()/1e3:.1f}k")
                                                    ^
pytorch_forecasting/data/timeseries.py:106:28: E226 missing whitespace around arithmetic operator
                f"{na} ({na/tensor.size(0):.2%}) of {name} "
                           ^

isort....................................................................Passed
black....................................................................Passed
nbqa-black...............................................................Passed
nbqa-isort...............................................................Passed
nbqa-flake8..............................................................Failed
- hook id: nbqa-flake8
- exit code: 1

docs/source/tutorials/stallion.ipynb:cell_7:25:53: E226 missing whitespace around arithmetic operator
print(f"Number of parameters in network: {tft.size()/1e3:.1f}k")
                                                    ^
docs/source/tutorials/stallion.ipynb:cell_9:29:53: E226 missing whitespace around arithmetic operator
print(f"Number of parameters in network: {tft.size()/1e3:.1f}k")
                                                    ^

nbqa-check-ast...........................................................Passed

After:

$ git checkout fix/pre-commit-failing 
Switched to branch 'fix/pre-commit-failing'
Your branch is up to date with 'origin/fix/pre-commit-failing'.
$ git rev-parse HEAD
16a119e4d05fe16089c5db9d7cc7bb3ea5a81f75
$ pre-commit run --all-files
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...............................................................Passed
check python ast.........................................................Passed
flake8...................................................................Passed
isort....................................................................Passed
black....................................................................Passed
nbqa-black...............................................................Passed
nbqa-isort...............................................................Passed
nbqa-flake8..............................................................Passed
nbqa-check-ast...........................................................Passed