fmcquillan99 commented on pull request #564:
URL: https://github.com/apache/madlib/pull/564#issuecomment-827124252


   Elsewhere I have seen different defaults used
   
   e.g., https://keras.io/api/optimizers/adam/ 
   ```
   beta1 = 0.9
   beta2 = 0.999
   epsilon=1e-07
   ```
   
   e.g., https://keras.io/api/optimizers/rmsprop/
   ```
   rho=0.9,
   momentum=0.0
   epsilon=1e-07
   ```
   Is there a reason we have deviated from these values?   e.g., seems we are 
using epsilon=1e-18


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