solin319 opened a new pull request #11793: fix bug when prefetch_buffer=1 URL: https://github.com/apache/incubator-mxnet/pull/11793 When prefetch_buffer=1 in mx.io.ImageRecordIter, read next batch before use data_batch.label can make the label change to next batch. But we need the label in this batch to update metric. So we move read data program after update metric, this can solve this problem.
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