Incorporate Tensor class in every model.

[rohansingh9001]

NOTE: Can only be worked on when issue #62 is solved and closed.

If the Tensor class has been implemented, we now need to incorporate into our repository code throughout.

Since Tensor class should have all the same methods as a NumPy array, duck typing will come into play and everything will work together, however, we need to use Tensors whenever new NumPy arrays are being generated and used.