[GitHub] [singa] joddiy edited a comment on pull request #748: add exp && round && rounde operators

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

joddiy edited a comment on pull request #748:
URL: https://github.com/apache/singa/pull/748#issuecomment-652152006


   > > Hi @joddiy , will this work for you? #749
   > 
   > seems not to work:
   > 
   > ![image](https://user-images.githubusercontent.com/14108933/85279938-d1cc5480-b4b9-11ea-84a2-91daf7f866c3.png)
   
   Hi, shicong, the `round` and `rounde` works now. However, the result of `rounde` is wrong now.
   
   please use this test:
   ```
   def rounde_helper(self, dev):
       X = np.array([0.1, 0.5, 0.9, 1.2, 1.5,
                   1.8, 2.3, 2.5, 2.7, -1.1,
                   -1.5, -1.9, -2.2, -2.5, -2.8]).astype(np.float32)
       x = tensor.from_numpy(X)
       x.to_device(dev)
   
       y_t = np.array([0., 0., 1., 1., 2.,
                   2., 2., 2., 3., -1.,
                   -2., -2., -2., -2., -3.]).astype(np.float32)
       dy = tensor.from_numpy(y_t)
       dy.to_device(dev)
   
       y = autograd.rounde(x)
       np.testing.assert_array_almost_equal(tensor.to_numpy(y), y_t)
   
   def test_rounde_cpu(self):
       self.rounde_helper(cpu_dev)
   
   @unittest.skipIf(not singa_wrap.USE_CUDA, 'CUDA is not enabled')
   def test_rounde_gpu(self):
       self.rounde_helper(gpu_dev)
   ```
   
   Specifically, Rounde(0.9) should be 1 instead of 0.
   
   I guess the formula should be:
   ```
   apply round(x / 2) * 2 if x - floor(x) == 0.5  else round(x)
   ```


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