optimizer and scheduler classes

pina/scheduler.py

@@ -0,0 +1,29 @@
+""" Module for PINA Scheduler """
+
+try:
+    from torch.optim.lr_scheduler import LRScheduler  # torch >= 2.0
+except ImportError:
+    from torch.optim.lr_scheduler import (
+        _LRScheduler as LRScheduler,
+    )  # torch < 2.0
+from .optimizer import Optimizer
+from .utils import check_consistency
+
+
+class Scheduler: # TODO improve interface
+    pass
+
+
+class TorchScheduler(Scheduler):
+
+    def __init__(self, scheduler_class, **kwargs):
+        check_consistency(scheduler_class, LRScheduler, subclass=True)
+
+        self.scheduler_class = scheduler_class
+        self.kwargs = kwargs
+
+    def hook(self, optimizer):
+        check_consistency(optimizer, Optimizer)
+        self.scheduler_instance = self.scheduler_class(
+            optimizer.optimizer_instance, **self.kwargs
+        )