[GitHub] [incubator-singa] chrishkchris opened a new pull request #478: Singa 473 (Implement ONNX Operators in Autograd: Trigonometry functions)

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chrishkchris opened a new pull request #478: Singa 473 (Implement ONNX Operators in Autograd: Trigonometry functions)
URL: https://github.com/apache/incubator-singa/pull/478
 
 
   This PR corresponds to JIRA ticket SINGA-473 (Implement ONNX Operators in Autograd: Trigonometry functions).
   
   The Open Neural Network Exchange (ONNX) is a format for interchanging neural network models between AI systems. There is a list of ONNX operators defined in https://github.com/onnx/onnx/blob/master/docs/Operators.md
   
   In this PR, we are going to implement more ONNX operators in our Autograd module (incubator-singa/python/singa/autograd.py). First of all, this ticket implements 11 unary Trigonometry functions in the Autograd module, which are:
   1. cos
   2. cosh
   3. sin
   4. sinh
   5. tan
   6. acos
   7. acosh
   8. asin
   9. asinh
   10. atan
   11. atanh

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