Angel-ML / Angel-ML/math2

MapMatrix.getRow(int indx) is a bug

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Dominant language
Java
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Description

in class com.tencent.angel.ml.math2.matrix.MapMatrix
```
public class MapMatrix extends Matrix {
protected HashMap mapMatrix;
}
```
because mapMatrix map's keyType is **Long**, so `this.mapMatrix.get(idx)` will return null when ids is **int** type.

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