add frcrn model

toolbox/torchaudio/models/frcrn/configuration_frcrn.py

@@ -13,6 +13,9 @@ class FRCRNConfig(PretrainedConfig):
                  num_gpus: int = -1,
 
                  lr: float = 0.001,
+                 lr_scheduler: str = "CosineAnnealingLR",
+                 lr_scheduler_kwargs: dict = None,
+
                  max_epochs: int = 100,
                  weight_decay: float = 0.00001,
                  clip_grad_norm: float = 10.,
@@ -40,6 +43,9 @@ class FRCRNConfig(PretrainedConfig):
         self.num_gpus = num_gpus
 
         self.lr = lr
+        self.lr_scheduler = lr_scheduler
+        self.lr_scheduler_kwargs = lr_scheduler_kwargs or dict()
+
         self.max_epochs = max_epochs
         self.weight_decay = weight_decay
         self.clip_grad_norm = clip_grad_norm