Homotopy for PTF

We can test for different PTF probabilities by increasing them over time for each learning step. We can see, that the results are getting better but after extended Dropout it doesnt help anymore.

Phase 1: No Dropout, so full Architectural Teacher Forcing will learn the history to very small error.

Phase 2: Increase Dropout probabilty by tiny factor and continue lerning.

Maximum dropout should be 30%.