Update solvers (#434)

* Enable DDP training with batch_size=None and add validity check for split sizes
* Refactoring SolverInterfaces (#435)
* Solver update + weighting
* Updating PINN for 0.2
* Modify GAROM + tests
* Adding more versatile loggers
* Disable compilation when running on Windows
* Fix tests

---------

Co-authored-by: giovanni <giovanni.canali98@yahoo.it>
Co-authored-by: FilippoOlivo <filippo@filippoolivo.com>

pina/loss/weighting_interface.py

@@ -0,0 +1,23 @@
+""" Module for Loss Interface """
+
+from abc import ABCMeta, abstractmethod
+
+
+class WeightingInterface(metaclass=ABCMeta):
+    """
+    The ``weightingInterface`` class. TODO
+    """
+
+    def __init__(self):
+        self.condition_names = None
+
+    @abstractmethod
+    def aggregate(self, losses):
+        """
+        Aggregate the losses.
+
+        :param dict(torch.Tensor) input: The dictionary of losses.
+        :return: The losses aggregation. It should be a scalar Tensor.
+        :rtype: torch.Tensor
+        """
+        pass