fixup! Fix aux unit tests

Author: eginhard

TTS/bin/train_encoder.py

@@ -125,7 +125,7 @@ def evaluation(model, criterion, data_loader, global_step):
 
 def train(model, optimizer, scheduler, criterion, data_loader, eval_data_loader, global_step):
     model.train()
-    best_loss = float("inf")
+    best_loss = {"train_loss": None, "eval_loss": float("inf")}
     avg_loader_time = 0
     end_time = time.time()
     for epoch in range(c.epochs):