[GitHub] [incubator-mxnet] leleamol commented on issue #12159: C++ api executor->Forward(false) is much slower than MXPredForward?

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leleamol commented on issue #12159: C++ api executor->Forward(false) is much slower than MXPredForward?
URL: https://github.com/apache/incubator-mxnet/issues/12159#issuecomment-473108997
 
 
   Hi @xiaojingxie
   
   The Executor->Forward() method performs more  tasks as compared to MXPredForward(). It invokes following 2 C APIs internally
   MXExecutorForward()
   and 
   MXExecutorOutputs()
   where as MXPredForward() only runs the forward pass and does not retrieve the outputs.
   In addition, the outputs of the forward pass are copied to the 'output' array in the Executor object, for faster retrieval later.
   
   Therefore, we can not compare MXPredForward() with Executor->Forward(). For the correct comparison, we should find out the time required to invoke MXPredGetOutputShape() and MXPredGetOutput() after invoking  the MXPredForward() 
   
   I hope this answers the question.
   @mxnet-label-bot add [Pending Requester Info]

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