# Uses of Package
org.apache.sysds.runtime.compress.colgroup

- Packages that use org.apache.sysds.runtime.compress.colgroup
  Package | Description
  --- | ---
  org.apache.sysds.runtime.compress |
  org.apache.sysds.runtime.compress.colgroup |
  org.apache.sysds.runtime.compress.estim |
  org.apache.sysds.runtime.compress.utils |

- Classes in org.apache.sysds.runtime.compress.colgroup used by org.apache.sysds.runtime.compress
  Class and Description
  ColGroup Class that stores information about a column group within a compressed matrix block.
  ColGroup.CompressionType Public Group types supported Note For instance DDC is called DDC not DDC1, or DDC2 which is a specific subtype of the DDC.

- Classes in org.apache.sysds.runtime.compress.colgroup used by org.apache.sysds.runtime.compress.colgroup
  Class and Description
  ADictionary This dictionary class aims to encapsulate the storage and operations over unique floating point values of a column group.
  ColGroup Class that stores information about a column group within a compressed matrix block.
  ColGroup.CompressionType Public Group types supported Note For instance DDC is called DDC not DDC1, or DDC2 which is a specific subtype of the DDC.
  ColGroupDDC Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC).
  ColGroupOffset Base class for column groups encoded with various types of bitmap encoding.
  ColGroupValue Base class for column groups encoded with value dictionary.
  Dictionary This dictionary class aims to encapsulate the storage and operations over unique floating point values of a column group.
  QDictionary This dictionary class aims to encapsulate the storage and operations over unique floating point values of a column group.

- Classes in org.apache.sysds.runtime.compress.colgroup used by org.apache.sysds.runtime.compress.estim
  Class and Description
  ColGroup.CompressionType Public Group types supported Note For instance DDC is called DDC not DDC1, or DDC2 which is a specific subtype of the DDC.

- Classes in org.apache.sysds.runtime.compress.colgroup used by org.apache.sysds.runtime.compress.utils
  Class and Description
  ColGroup Class that stores information about a column group within a compressed matrix block.

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