Jerryzcn edited a comment on issue #11834: Fix mxnet ctc_loss bug
URL: https://github.com/apache/incubator-mxnet/pull/11834#issuecomment-408250960
 
 
   
   Thanks @HawkAaron.
   
   it seems removing the max subtraction negatively affect convergence. Do you 
observe similar result?
   
   In the original baidu ctc, there is a section that do max subtraction. I 
suspect the broadcast is too slow here. Maybe we should
   ```
   for(int r = 0; r < alphabet_size_; ++r) {
       probs[r + col_offset] = std::exp(activations[r + col_offset] - 
max_activation);
       denom += probs[r + col_offset];
   }
   ```

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