Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/121
```
Caused by: java.lang.IllegalArgumentException: numCols SHOULD be greater
than zero. numCols = rowEnd - rowStart = 0 - 0 = 0
at hivemall.math.matrix.MatrixUtils.sortIndicies(MatrixUtils.java:284)
at hivemall.math.matrix.MatrixUtils.coo2csr(MatrixUtils.java:121)
at
hivemall.math.matrix.sparse.floats.DoKFloatMatrix.toRowMajorMatrix(DoKFloatMatrix.java:367)
at
hivemall.math.matrix.sparse.floats.DoKFloatMatrix.toRowMajorMatrix(DoKFloatMatrix.java:41)
at hivemall.recommend.SlimUDTF.train(SlimUDTF.java:402)
at hivemall.recommend.SlimUDTF.replayTrain(SlimUDTF.java:647)
at hivemall.recommend.SlimUDTF.runIterativeTraining(SlimUDTF.java:592)
```
---
