optimize the logic of creating COO matrix from another COO matrix.

yanboliang / spark-vlbfgs

Vector-free L-BFGS implementation for Spark MLlib

Apache License 2.0

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optimize the logic of creating COO matrix from another COO matrix. #37

Closed uncleGen closed 7 years ago

uncleGen commented 7 years ago

The main change is to optimize the logic of creating COO matrix from another COO matrix. As the row indices and column indices is sorted when be created, so we can use the sub-array directly to create another COO matrix without sorting them.

Besides, this pr fixed some code style issues.

No new unit test is added and all unit test passed.