Add missing abstract.py file

prototorch/models/abstract.py

@@ -0,0 +1,14 @@
+import pytorch_lightning as pl
+import torch
+
+
+class AbstractLightningModel(pl.LightningModule):
+    def configure_optimizers(self):
+        optimizer = torch.optim.Adam(self.parameters(), lr=self.hparams.lr)
+        return optimizer
+
+
+class AbstractPrototypeModel(AbstractLightningModel):
+    @property
+    def prototypes(self):
+        return self.proto_layer.components.detach().numpy()