train_network: A function to use the Pandas Dataframe in order to train a Feed-Forward model using the featurized data as well as the stock price on a given day to learn the relationship between any features and the actual stock price.

[JKelly423]

A function to use the Pandas Dataframe in order to train a Feed-Forward model using the featurized data as well as the stock price on a given day to learn the relationship between any features and the actual stock price.
The network will be created with another function and should be called prior to this function. The network will be globally declared in the class and will be referred to as self.network

Params: Pandas Dataframe

Returns: True if network successfully trained, False if an error occurs.