Inaccuracies with CNN for MAGIST Lite and Missing Transfer Learning

**Description**
The MAGIST CNN isn't tuned properly for large and high-class datasets. More tuning is required for higher convergence and lower training time.

**Expectation**
Ideally, it should train within 30mins to be effective.

**Additional context**
Need to apply TensorFlow transfer learning API for custom AI models. **NOTE: This is not the same thing as the TF Object Detection API.**