Tests needed: - [x] dnn/test_model (to finish) - [x] dnn/test_dense - [x] dnn/test_optimizer - [x] dnn/test_gd_optimizer - [x] dnn/test_loss - [x] dnn/test_mse_loss - [x] dnn/test_cce_loss - [x] dnn/test_recurrent - [x] middleware/feed_forward (latest) - [ ] middleware/recurrent (latest)