[GitHub] asitstands commented on issue #10575: [MXNET-145] Remove global PRNGs of numpy and python used in mx.image package

[GitBox]

asitstands commented on issue #10575: [MXNET-145] Remove global PRNGs of numpy 
and python used in mx.image package
URL: https://github.com/apache/incubator-mxnet/pull/10575#issuecomment-381871354
 
 
   A simple benchmark using `ImageIter` shows a bad performance degradation. On 
Xeon E5-2680, the current master runs the following code in about 28s. The time 
is increased to 42s if this PR is applied. It is 50% increase of the running 
time.
   ```python
   start = time.time()
   data = mx.img.ImageIter(
                batch_size=32,
                data_shape=(3, 224, 224),
                path_imgrec='caltech.rec', # 9144 image samples
                rand_crop=True,
                rand_resize=True,
                rand_mirror=True,
                rand_gray=0.5,
                brightness=0.5,
                contrast=0.5,
                saturation=0.5)
   for i in data:
        pass
   mx.nd.waitall()
   end = time.time()
   print("elapsed time: ", end - start)
   ```

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