fixex imports

pytorch_lightning/root_module/optimization.py

@@ -0,0 +1,22 @@
+from torch import nn
+from torch import optim
+
+
+class OptimizerConfig(nn.Module):
+
+    def choose_optimizer(self, optimizer, params, optimizer_params, opt_name_key):
+        if optimizer == 'adam':
+            optimizer = optim.Adam(params, **optimizer_params)
+        if optimizer == 'sparse_adam':
+            optimizer = optim.SparseAdam(params, **optimizer_params)
+        if optimizer == 'sgd':
+            optimizer = optim.SGD(params, **optimizer_params)
+        if optimizer == 'adadelta':
+            optimizer = optim.Adadelta(params, **optimizer_params)
+
+        # transfer opt state if loaded
+        if opt_name_key in self.loaded_optimizer_states_dict:
+            state = self.loaded_optimizer_states_dict[opt_name_key]
+            optimizer.load_state_dict(state)
+
+        return optimizer