* Update train.py with simplified ckpt names

* Return default hyps to hyp.scratch.yaml

Leave line commented for future use once mystery of best finetuning hyps to apply becomes clearer.

* Force test_batch*_pred.jpg replot on final epoch

This will allow you to see predictions final testing run after training completes in runs/exp0

* Class frequency not calculated on resuming training

Calculation of class frequency is not needed when resuming training.
Anchors can still be recalculated whether resuming or not.

* Check rank for autoanchor

* Update train.py

no autoanchor checks on resume
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* the value should be a list to unpacking

* filter the None labels

* update readme to remove apex dependency

* add support for DWConv fuse operation

Cleaned up code

* Add InfiniteDataLoader

Only initializes at first epoch. Saves time.

* Moved class to a better location

Don't load the entire torchvision library just for nms when the function is already in the torch library.

Fixes #822

`init_seeds` from `torch_utils` import is being overwritten by function `init_seeds` in `general.py`

eps reduced to 1e-9 for additional precaution.