# Package org.apache.sysds.lops

- Class Summary
  Class | Description
  --- | ---
  Append |
  AppendG | TODO Additional compiler enhancements: 1) Partial Shuffle Elimination - Any full or aligned blocks could be directly output from the mappers to the result index.
  AppendGAlignedSP |
  AppendM |
  AppendR |
  Binary | Lop to perform binary operation.
  BinaryM | Lop to perform binary operation.
  BinaryScalar | Lop to perform binary scalar operations.
  BinaryUAggChain |
  CentralMoment | Lop to perform cross product operation
  Checkpoint | Lop for checkpoint operations.
  Compression |
  CoVariance | Lop to compute covariance between two 1D matrices
  CSVReBlock | Lop to convert CSV data into SystemDS data format
  Ctable | Lop to perform ternary operation.
  CumulativeOffsetBinary |
  CumulativePartialAggregate |
  Data | Lop to represent data objects.
  DataGen | Defines a LOP that generates data.
  DeCompression |
  DnnTransform |
  Federated |
  FunctionCallCP |
  GroupedAggregate | Lop to perform grouped aggregates
  GroupedAggregateM | Lop to perform mr map-side grouped aggregates (restriction: sum, w/o weights, ngroups), groups broadcasted
  LeftIndex |
  Lop | Base class for all Lops.
  LopProperties |
  MapMult |
  MapMultChain |
  MatMultCP |
  MMCJ | Lop to perform cross product operation
  MMRJ | Lop to perform cross product operation
  MMTSJ | Lop to perform transpose-identity operation (t(X)%*%X or X%*%t(X)), used to represent CP and MR instruction but in case of MR there is an additional Aggregate at the reducers.
  MMZip | Lop to perform zip matrix multiplication
  Nary | Lop to perform an operation on a variable number of operands.
  OutputParameters | class to maintain output parameters for a lop.
  ParameterizedBuiltin | Defines a LOP for functions.
  PartialAggregate | Lop to perform a partial aggregation.
  PickByCount |
  PMapMult |
  PMMJ |
  ReBlock | Lop to perform reblock operation
  RightIndex |
  SortKeys |
  SpoofFused |
  Sql |
  Ternary | Lop to perform Sum of a matrix with another matrix multiplied by Scalar.
  TernaryAggregate |
  Transform |
  UAggOuterChain | TODO Currently this lop only support the right hand side in distributed cache.
  Unary | Lop to perform following operations: with one operand -- NOT(A), ABS(A), SQRT(A), LOG(A) with two operands where one of them is a scalar -- H=H*i, H=H*5, EXP(A,2), LOG(A,2)
  UnaryCP |
  WeightedCrossEntropy |
  WeightedCrossEntropyR |
  WeightedDivMM |
  WeightedDivMMR |
  WeightedSigmoid |
  WeightedSigmoidR |
  WeightedSquaredLoss |
  WeightedSquaredLossR |
  WeightedUnaryMM |
  WeightedUnaryMMR |

- Enum Summary
  Enum | Description
  --- | ---
  AppendM.CacheType |
  BinaryM.VectorType |
  Compression.CompressConfig |
  Ctable.OperationTypes |
  DeCompression.CompressConfig |
  GroupedAggregateM.CacheType |
  LeftIndex.LixCacheType |
  Lop.SimpleInstType | Lop types
  Lop.Type |
  Lop.VisitStatus |
  MapMult.CacheType |
  MapMultChain.ChainType |
  MMCJ.MMCJType |
  MMTSJ.MMTSJType |
  PickByCount.OperationTypes |
  PMMJ.CacheType |
  SortKeys.OperationTypes |
  WeightedCrossEntropy.WCeMMType |
  WeightedDivMM.WDivMMType |
  WeightedSigmoid.WSigmoidType |
  WeightedSquaredLoss.WeightsType |
  WeightedUnaryMM.WUMMType |

- Exception Summary
  Exception | Description
  --- | ---
  LopsException |

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