# Package ml.dmlc.xgboost4j.java.util

- Class Summary
  Class | Description
  --- | ---
  BigDenseMatrix | Off-heap implementation of a Dense Matrix, matrix size is only limited by the amount of the available memory and the matrix dimension cannot exceed Integer.MAX_VALUE (this is consistent with XGBoost API restrictions on maximum length of a response).
  UtilUnsafe | Simple class to obtain access to the `Unsafe` object.

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