[GitHub] [incubator-mxnet] anirudhacharya commented on issue #13199: Namescope is None when hybridize in multi-threading environment. AttributeError: 'NoneType' object has no attribute '__exit__'

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

anirudhacharya commented on issue #13199: Namescope is None when hybridize in multi-threading environment. AttributeError: 'NoneType' object has no attribute '__exit__'
URL: https://github.com/apache/incubator-mxnet/issues/13199#issuecomment-469448283
 
 
   mxnet in general is not thread safe. You can accomplish the above using multiprocessing.
   
   ```python
   import multiprocessing as mp
   import gluoncv
   import mxnet as mx
   
   net = gluoncv.model_zoo.resnet18_v1b(pretrained=True)
   net.hybridize()
   
   def worker(module, input, outputs):
       outnd = module(input)  # type: mx.nd.NDArray
       outnd.wait_to_read()
       outputs.put(outnd)
   
   ps = []
   outputs = mp.Queue(5) 
   for i in range(3):
       input1 = mx.random.randn(1, 3, 368, 368)
       p = mp.Process(target=worker, args=(net, input1, outputs))
       ps.append(p)
   
   for p in ps:
       p.start()
   for p in ps:
       p.join()
   
   while not outputs.empty():
       print(outputs.get().shape)  
   ```

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