szha closed pull request #11793: fix bug when prefetch_buffer=1
URL: https://github.com/apache/incubator-mxnet/pull/11793
This is a PR merged from a forked repository.
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diff --git a/python/mxnet/module/base_module.py
b/python/mxnet/module/base_module.py
index 4b7355ffa92..654e41bf365 100644
--- a/python/mxnet/module/base_module.py
+++ b/python/mxnet/module/base_module.py
@@ -514,12 +514,6 @@ def fit(self, train_data, eval_data=None,
eval_metric='acc',
monitor.tic()
self.forward_backward(data_batch)
self.update()
- try:
- # pre fetch next batch
- next_data_batch = next(data_iter)
- self.prepare(next_data_batch,
sparse_row_id_fn=sparse_row_id_fn)
- except StopIteration:
- end_of_batch = True
if isinstance(data_batch, list):
self.update_metric(eval_metric,
@@ -528,6 +522,13 @@ def fit(self, train_data, eval_data=None,
eval_metric='acc',
else:
self.update_metric(eval_metric, data_batch.label)
+ try:
+ # pre fetch next batch
+ next_data_batch = next(data_iter)
+ self.prepare(next_data_batch,
sparse_row_id_fn=sparse_row_id_fn)
+ except StopIteration:
+ end_of_batch = True
+
if monitor is not None:
monitor.toc_print()
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