Hi flinkers, 
I a new flink user and have been working on a pipeline from kafka to mongo that 
processes documents and cluster them using inn for information retrieval. 

I have a data set which is an array of sparse vectors, but I’m having a bit of 
a hard time interpreting the output of the knn model: 
flink is outputting a data set consisting of pairs (vector, array[vector])?  

1. how can I fetch the cluster assigments? 
2. what does .setBlocks do? 
3. what is .sizeHint? 

Happy to contribute to wiki (adding more details) if someone can pitch in with 
some hints. 

Thanks a lot,
Alex
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