chengdazhi opened a new issue #9914: Gluon speed issus when input size varies 
across batches
   Hi. I have noticed that the gluon framework has speed issues when the input 
spatial size varies across batches. It causes an approximate **2x delay** on a 
single GPU, and makes **multiple GPUs to have little gain**. The framework 
discards previous GPU memory blocks when start processing a new batch, which 
leads to violent GPU memory fluctuations. 
   This problem is absent in previous non-gluon training systems.

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