[GitHub] [incubator-singa] chrishkchris opened a new pull request #523: SINGA-478 Improve __itruediv__ in tensor.py

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chrishkchris opened a new pull request #523: SINGA-478 Improve __itruediv__ in tensor.py
URL: https://github.com/apache/incubator-singa/pull/523
 
 
   Improve the __itruediv__ operation by using the /= operator in c tensor directly instead of *= operator.
   
   Has tested two cases (because for end to end purpose):
   Case 1. simple tensor division in ncrf docker container
   ```python
   from singa import tensor
   from singa import device
   import numpy as np
   
   Y = np.ones(shape=[10],dtype=np.float32) * 10.0
   y = tensor.from_numpy(Y)
   y.to_device(device.get_default_device())
   
   y.to_device(device.create_cuda_gpu_on(1))
   
   def divide(y):
      y /= 10
   
   divide(y)
   print(tensor.to_numpy(y))
   
   ```
   Result
   ```
   root@26c9db193eb0:~/incubator-singa# python3 /root/incubator-singa/python/singa/test.py
   [1. 1. 1. 1. 1. 1. 1. 1. 1. 1.]
   ```
   
   Case 2. 8 GPUs mnist distributed training in AWS (i.e. mnist_dist_demo.py)

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