[GitHub] [incubator-mxnet] szha commented on issue #7410: mxnet random seed should not be fixed by default

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

szha commented on issue #7410:
URL: https://github.com/apache/incubator-mxnet/issues/7410#issuecomment-682166637


   > I saw a different result on CPU and GPU by using the same seed value. Is this an expected behavior or am I missing something here ??
   > 
   > ## script
   > ```python
   > import mxnet as mx
   > mx.random.seed(99)
   > t_cpu = mx.nd.random.uniform(shape=(4), ctx=mx.cpu())
   > print("CPU: ", t_cpu)
   > mx.random.seed(99)
   > t_gpu = mx.nd.random.uniform(shape=(4), ctx=mx.gpu(0))
   > print("GPU: ", t_gpu)
   > ```
   > 
   > ## Output
   > ```shell
   > CPU:
   > [0.9509902  0.71019113 0.7611274  0.08560332]
   > <NDArray 4 @cpu(0)>
   > GPU:
   > [0.29560053 0.07938761 0.29997164 0.4891801 ]
   > <NDArray 4 @gpu(0)>
   > ```
   
   This is expected. Setting the seed on a device only guarantees reproducible results on the same device, and does not guarantee the same result on different devices.


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