Normalization

BatchNorm, LayerNorm, GroupNorm, RMSNorm, dropout — when to use which, and how each shifts gradients.

1. 1. ○ Implement Batch Normalization
2. 2. ○ Implement Layer Normalization
3. 3. ○ Implement Group Norm
4. 4. ○ RMSNorm
5. 5. ○ Implement Dropout
6. 6. ○ Feature Normalization Pipeline