Add a wrapper for initializers

[ngarneau]

This should includes wrappers for pytorch modules, which do not support initializers in their constructors.

Furthermore, there should be some kind of way to take a given pytorch module and initialize it with default and user-chosen intializers depending on the type of the modules inside the given module. For instance, say I have some module A which contains other modules and some of them are of type Linear. The functionality should take the module A as a parameters and initialize the Linear modules in some default or non-default way.