update readme

Author: aladdinpersson

README.md

@@ -46,6 +46,7 @@ If you have any specific video suggestion please make a comment on YouTube :)
 * [![Youtube Link][logo]](https://youtu.be/ZoZHd0Zm3RY)   [Custom Dataset (Images)](https://github.com/aladdinpersson/Machine-Learning-Collection/tree/master/ML/Pytorch/Basics/custom_dataset)
 * [![Youtube Link][logo]](https://youtu.be/9sHcLvVXsns)   [Custom Dataset (Text)](https://github.com/aladdinpersson/Machine-Learning-Collection/tree/master/ML/Pytorch/Basics/custom_dataset_txt)
 * [![Youtube Link][logo]](https://youtu.be/ks3oZ7Va8HU)   [Mixed Precision Training](https://github.com/aladdinpersson/Machine-Learning-Collection/blob/master/ML/Pytorch/Basics/pytorch_mixed_precision_example.py)
+* [![Youtube Link][logo]](https://youtu.be/4JFVhJyTZ44)   [Imbalanced dataset](https://github.com/aladdinpersson/Machine-Learning-Collection/tree/master/ML/Pytorch/Basics/Imbalanced_classes)
 * [![Youtube Link][logo]](https://youtu.be/qaDe0qQZ5AQ)   [Transfer Learning and finetuning](https://github.com/aladdinpersson/Machine-Learning-Collection/blob/master/ML/Pytorch/Basics/pytorch_pretrain_finetune.py)
 * [![Youtube Link][logo]](https://youtu.be/Zvd276j9sZ8)   [Data augmentation using Torchvision](https://github.com/aladdinpersson/Machine-Learning-Collection/blob/master/ML/Pytorch/Basics/pytorch_transforms.py)
 * [![Youtube Link][logo]](https://youtu.be/rAdLwKJBvPM)   [Data augmentation using Albumentations](https://github.com/aladdinpersson/Machine-Learning-Collection/tree/master/ML/Pytorch/Basics/albumentations_tutorial)