wangwei created SINGA-342:
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             Summary: Support autograd 
                 Key: SINGA-342
                 URL: https://issues.apache.org/jira/browse/SINGA-342
             Project: Singa
          Issue Type: New Feature
            Reporter: wangwei


Autograd computes the partial derivatives of a complex function following chain 
rule (or back-propagation).

To implement autograd, we can follow 
[https://stackoverflow.com/questions/32034237/how-does-numpys-transpose-method-permute-the-axes-of-an-array]
 and [https://github.com/HIPS/autograd.]

In particular, we record the operation and operands of each result tensor 
during forward propagation. A graph is constructed based on the recorded 
information. Once the loss.backward() is triggered, we run backward propagation 
over the graph to compute the gradients of parameters.



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