Maysam Yabandeh created MAHOUT-1238:
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Summary: VectorWritable's bug with VectorView of sparse vectors
Key: MAHOUT-1238
URL: https://issues.apache.org/jira/browse/MAHOUT-1238
Project: Mahout
Issue Type: Bug
Components: Math
Affects Versions: 0.7, 0.8
Reporter: Maysam Yabandeh
Fix For: 0.8, 0.7
VectorWritable raises an exception if it is used on a VectorView of a sparse
vector. The reason is that the sparse vector writes only the non-zero elements,
while VectorView's implementation of getNumNondefaultElements() returns the
size of the entire data. Later when reading the vector, VectorWritable expects
reading more items that was written.
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