diff --git a/tools/train.py b/tools/train.py
index 83a9196ab2e7b7e3151abada9eddd3bce2c9e8d6..716b7b8a62b1f43199e98580aacdce9991fe6255 100755
--- a/tools/train.py
+++ b/tools/train.py
@@ -172,7 +172,6 @@ def run(FLAGS, cfg, place):
                 model.apply_collective_grads()
             else:
                 loss.backward()
-            optimizer.minimize(loss)
             optimizer.step()
             curr_lr = optimizer.get_lr()
             lr.step()