Fixed unfitted gaussianDB problem

[Sarthak-Biswas]

Status

READY and FIXED

Description

The "GaussianDB is not fitted yet" occurs due to the fact that NOT training the model from root directory of SecureTea causes a relative path problem. This makes the 'fit' to not find the GaussianDB instance.

Fixes

• Added a model trained from the root directory.
• Added train.py function to pre-train the model in case of any error occurs in future.
• Update docs for both user and contributor.
• Added tensorflow to requirements
• Modified the code to make the prediction features match the exact set of training features.

TODO:

• Training the model with other parameters.

This PR relates to the issue #371