[GitHub] [incubator-mxnet] ChaiBapchya opened a new issue #16172: Flaky randint large vector

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

ChaiBapchya opened a new issue #16172: Flaky randint large vector 
URL: https://github.com/apache/incubator-mxnet/issues/16172
 
 
   `test_large_vector.test_ndarray_random_randint` fails the assertion
   ```
   assert (a >= low).all()  and (a < high).all()
   ```
   
   because only 1 value in the entire 4.3bn vector is outside the bounds (>= low and <high)
   at that index, garbage value seems to be assigned
   
   Tried it multiple times, failed for following seeds
   For seed *MXNET_TEST_SEED**=**278341920*
   ```
   (Pdb) p np.where(a<low)
   (array([2641572060]),)
   (Pdb) p  np.where(a>=high)
   (array([], dtype=int64),)
   (Pdb) p a[2641572060]
   -4012640295
   ```
   
   For seed **MXNET_TEST_SEED=65322548**
   ``` 
   (Pdb) p np.where(a<low) 
   (array([3303987565]),) 
   (Pdb) p np.where(a>=high) 
   (array([], dtype=int64),) 
   (Pdb) p a[3303987565] 
   -2345151068
   ```
   
   MXNET_TEST_SEED=180664123
   ```
   (Pdb) p np.where(a<low)
   (array([4298679960]),)
   (Pdb) p a[4298679960]
   -3002281203
   (Pdb) p np.where(a>=high)
   (array([], dtype=int64),)
   ```
   
   Built with `USE_INT64_TENSOR_SIZE=ON`
   Test with
   ```
   $ MXNET_TEST_COUNT=1 nosetests --logging-level=DEBUG --verbose -s tests/nightly/test_large_vector.py:test_ndarray_random_randint
   ```

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