Prune Callback

Use the pruner in fastai Callback system

PruneCallback

 PruneCallback (sparsity:int, context:str, criteria:Callable,
                schedule:Callable,
                model:torch.nn.modules.module.Module=None,
                round_to:int=None,
                layer_type:torch.nn.modules.module.Module=<class
                'torch.nn.modules.conv.Conv2d'>)

Basic class handling tweaks of the training loop by changing a Learner in various events