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dataloader modified #305

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haven890611
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Accelerate the training phase when using mosaic and mixup.
The optimization of the data loader and processing accelerates about 3 times faster.

The reference is from the dataloader and augment of YOLOv8.

if self.augment:
hyp['mosaic'] = hyp['mosaic'] if self.augment and not self.rect else 0.0
hyp['mixup'] = hyp['mixup'] if self.augment and not self.rect else 0.0
transforms = v8_transforms(self, self.img_size, hyp)

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Suggested change
transforms = v8_transforms(self, self.img_size, hyp)
transforms = v9_transforms(self, self.img_size, hyp)

Looks like there is a typo here ^

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Thanks for your reminder!

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