[GitHub] solin319 opened a new issue #11061: mx.nd.argmax is slow

[GitBox <gi...@apache.org>]

solin319 opened a new issue #11061: mx.nd.argmax is slow
URL: https://github.com/apache/incubator-mxnet/issues/11061
 
 
   ```
   import time
   import mxnet as mx
   import numpy as np
   import os
   tmp = mx.nd.random.uniform(-1, 1, shape=(64,300000), ctx=mx.gpu())
   #tmp = np.random.RandomState().uniform(-1, 1, (64,300000))
   tic = time.time()
   for i in range(20):
      if (i == 5):
           begin = time.time();
      elif (i == 15):
           end = time.time();
      tic = time.time()
      max = mx.nd.argmax(tmp, axis=1)
      #max = np.argmax(tmp, axis=1)
      print max[0]
      toc = time.time() - tic
      print ("used time %f:"%toc)
   avg = (end - begin) / 10
   print ("avg time %f"%avg)
   
   ```
   We use code before to test the speed of argmax.
   NDArray in cpu use 0.112895s.
   NDArray in gpu use 0.280577.
   numpy.array only use 0.018021.
   
   Why mx.nd.argmax is so slow?

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