piiswrong closed pull request #10437: [MXNET-171] Fix a bug that was causing 
training accuracy to be printed as nan sometimes
URL: https://github.com/apache/incubator-mxnet/pull/10437

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diff --git a/python/mxnet/module/base_module.py 
index c03f8e73cda..8f5fd4ab854 100644
--- a/python/mxnet/module/base_module.py
+++ b/python/mxnet/module/base_module.py
@@ -522,6 +522,9 @@ def fit(self, train_data, eval_data=None, eval_metric='acc',
                 if monitor is not None:
+                if end_of_batch:
+                    eval_name_vals = eval_metric.get_name_value()
                 if batch_end_callback is not None:
                     batch_end_params = BatchEndParam(epoch=epoch, 
@@ -531,7 +534,7 @@ def fit(self, train_data, eval_data=None, eval_metric='acc',
                 nbatch += 1
             # one epoch of training is finished
-            for name, val in eval_metric.get_name_value():
+            for name, val in eval_name_vals:
                 self.logger.info('Epoch[%d] Train-%s=%f', epoch, name, val)
             toc = time.time()
             self.logger.info('Epoch[%d] Time cost=%.3f', epoch, (toc-tic))


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