Improve robustness of `check_requirements()` function to offline environments (do not attempt pip installs when offline).

remove datatype conversion process that can be skipped

* Add `timeout()` class

* rearrange order

* Parse URL authentication

* urllib.parse.unquote()

* improved error handling

* improved error handling

* remove %3F

* update check_file()

* Update README.md

* Changing FLOPS to FLOPs.

Co-authored-by: BuildTools <unconfigured@null.spigotmc.org>

Returns `True` if file is part of pip package. Useful for contextual behavior modification.

```python
def is_pip():
    # Is file in a pip package?
    return 'site-packages' in Path(__file__).absolute().parts
```

* Update datasets.py

* comment

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Add URL file download to check_file()

* cleanup

* pathlib bug fix

Add try: except clause on missing requirements install to catch install failures. Prompted by Ultralytics YOLOv5 API failure on Cython.

* Changing save_one_box 

Made to work with other changes to common.py

* PEP8 and single line BGR

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* adds latest tag to match wandb defaults

* adds entity handling, 'last' tag

* fixes bug causing finished runs to resume

* removes redundant "last" tag for wandb artifact

Bug fix to check batch_size divisibility of utilized CUDA device count vs total system CUDA device count.

* Color can be none by default

* `plot_one_box()` default `color=(128, 128, 128)`

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Added max_det parameters in various places

* 120 character line

* PEP8

* 120 character line

* Update inference default to 1000 instances

* Update inference default to 1000 instances

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update Colors()

* update colors

* update colors

* Add check_python()

Checks python version against minimum version of 3.7.0.

* remove packaging dependency

* refactor import

* Explicitly convert artifact path to posix_path

* Remove redudant str() casting

* download() ThreadPool update

* update train image count

* cid + 1

* Add NMS threshold checks

* fix

* Curl update

* Curl update

* Improve performance of Dataset Logger

* Fix scaling bug

This fixes a bug where the '>' symbol in python package requirements was not running correctly with subprocess.check_output() commands.

* Add verbose and update print to logging

* Fix positonal param

* Revert auto formatting changes

* Update hubconf.py

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>