ChaiBapchya opened a new pull request #15772: Add symbol api for randn and fix 
shape issue for randn ndarray and symbol api
URL: https://github.com/apache/incubator-mxnet/pull/15772
 
 
   ## Description ##
   1. Randn is not currently present in symbol API
   Fixes https://github.com/apache/incubator-mxnet/issues/12755
   
   2. Currently randn gives issue when passed NDArray to the randn function 
parameters loc and scale
   ```
   >>> mx.nd.random.randn((2, 3), loc=a, scale=a)
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
     File 
"/Users/bapac/workspace/incubator-mxnet/python/mxnet/ndarray/random.py", line 
223, in randn
       assert isinstance(loc, (int, float))
   AssertionError
   ```
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [ ] Changes are complete (i.e. I finished coding on this PR)
   - [ ] All changes have test coverage:
   - [ ] Code is well-documented: 
   - [ ] To the my best knowledge, examples are either not affected by this 
change, or have been fixed to be compatible with this change
   
   ### Changes ###
   Original works as well
   loc and scale scalar
   ```
   >>> mx.nd.random.randn(2, 3, loc=5, scale=1)
   
   [[7.2122064 5.774004  6.0434403]
    [6.1839256 6.891711  3.7652586]]
   <NDArray 2x3 @cpu(0)>
   ```
   loc and scale as NDArray
   ```
   >>> a=mx.nd.array([[1,2],[3,4]])
   >>> a
   
   [[1. 2.]
    [3. 4.]]
   <NDArray 2x2 @cpu(0)>
   >>> mx.nd.random.randn(2, 3, loc=a, scale=a)
   
   [[[[-0.771029    0.5486156   1.5793836 ]
      [-0.85608196 -0.9768796   0.7919808 ]]
   
     [[ 2.4888437   1.9256786   1.0245001 ]
      [ 1.9547654   3.1492283   4.9322524 ]]]
   
   
    [[[ 5.0588713   4.064883    6.2195086 ]
      [ 3.3605237   0.08666945  0.6729102 ]]
   
     [[ 0.8471296   6.967091   -1.8937755 ]
      [-0.29237127 -0.16993093 -1.3115396 ]]]]
   <NDArray 2x2x2x3 @cpu(0)>
   ```

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