survival-analysis

Hi,
I ran into the following assertion error when computing the c-index for the discrete MTLR method.

assert durations.shape[0] == surv.shape[1] == surv_idx.shape[0] == events.shape[0]

I suppose the error is due to the fact that the maximum of test durations is 1628***, while the function gets in input a number between 0 and 490. This range (0, 490) is the result of applying the following

Currently we do not have notebooks that compare performance of DSM with other models.

We would need to compare against:
-DeepHit
-DeepSurv
-Random Survival Forest
-Cox PH
on Time Dependent CI and Brier Score.

Following changes are required:

1. Remove composition from crank to distr - This doesn't make any sense for abstract rankings, composition can only make sense for lpto distr.
2. Add composition from response to distr - This can be most efficiently done by abstracting the probabilistic regression composition and using the same functions in both

(1) is higher priority as its resul