fix win train loader

tools/program.py

@@ -199,8 +199,12 @@ def train(config,
         train_reader_cost = 0.0
         batch_sum = 0
         batch_start = time.time()
-        for idx, batch in enumerate(train_dataloader()):
+        max_iter = len(train_dataloader) - 1 if platform.system(
+        ) == "Windows" else len(train_dataloader)
+        for idx, batch in enumerate(train_dataloader):
             train_reader_cost += time.time() - batch_start
+            if idx >= max_iter:
+                break
             lr = optimizer.get_lr()
             images = batch[0]
             if use_srn: