YOLOv5 + Albumentations integration (#3882)

* Albumentations integration

* ToGray p=0.01

* print confirmation

* create instance in dataloader init method

* improved version handling

* transform not defined fix

* assert string update

* create check_version()

* add spaces

* update class comment

requirements.txt

@@ -27,4 +27,5 @@ pandas
 # extras --------------------------------------
 # Cython  # for pycocotools https://github.com/cocodataset/cocoapi/issues/172
 # pycocotools>=2.0  # COCO mAP
+# albumentations>=1.0.0
 thop  # FLOPs computation