fix bug

gpu_mnist_example/train.py

@@ -109,7 +109,7 @@ if __name__ == '__main__':
         start_epoch = 0
         print('无保存模型，将从头开始训练！')
  
-    for epoch in range(start_epoch+1, epochs):
+    for epoch in range(start_epoch+1, epochs+1):
         train(model, train_loader, epoch)
         test(model, test_loader, test_dataset)
         # 将模型保存到c2net_context.output_path