Implement Dataset, Dataloader and DataModule class and fix SupervisedSolver

pina/data/supervised_dataset.py

@@ -0,0 +1,12 @@
+"""
+Supervised dataset module
+"""
+from .base_dataset import BaseDataset
+
+
+class SupervisedDataset(BaseDataset):
+    """
+    This class extends the BaseDataset to handle datasets that consist of input-output pairs.
+    """
+    data_type = 'supervised'
+    __slots__ = ['input_points', 'output_points']