Class ColGroupEmpty
- java.lang.Object
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- org.apache.sysds.runtime.compress.colgroup.AColGroup
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- org.apache.sysds.runtime.compress.colgroup.AColGroupCompressed
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- org.apache.sysds.runtime.compress.colgroup.ColGroupEmpty
 
 
 
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- All Implemented Interfaces:
- Serializable
 
 public class ColGroupEmpty extends AColGroupCompressed - See Also:
- Serialized Form
 
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Nested Class Summary- 
Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupAColGroup.CompressionType
 
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Constructor SummaryConstructors Constructor Description ColGroupEmpty(int[] colIndices)Constructs an Constant Colum Group, that contains only one tuple, with the given value.
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Method SummaryAll Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description AColGroupbinaryRowOpLeft(BinaryOperator op, double[] v, boolean isRowSafe)Perform a binary row operation.AColGroupbinaryRowOpRight(BinaryOperator op, double[] v, boolean isRowSafe)Perform a binary row operation.CM_COV_ObjectcentralMoment(CMOperator op, int nRows)Central Moment instruction executed on a column group.voidcomputeColSums(double[] c, int nRows)Compute the column sumbooleancontainsValue(double pattern)Detect if the column group contains a specific value.AColGroupcopy()Get a copy of this column group note this is only a shallow copy.static ColGroupEmptycreate(int nCol)voiddecompressToDenseBlock(DenseBlock target, int rl, int ru, int offR, int offC)Decompress into the DenseBlock.voiddecompressToSparseBlock(SparseBlock sb, int rl, int ru, int offR, int offC)Decompress into the SparseBlock.org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupTypegetColGroupType()AColGroup.CompressionTypegetCompType()Obtain the compression type.doublegetCost(ComputationCostEstimator e, int nRows)Get the computation cost associated with this column group.doublegetIdx(int r, int colIdx)Get the value at a colGroup specific row/column index position.doublegetMax()Short hand method for getting maximum value contained in this column group.doublegetMin()Short hand method for getting minimum value contained in this column group.longgetNumberNonZeros(int nRows)Get the number of nonZeros contained in this column group.intgetNumValues()Obtain number of distinct tuples in contained sets of values associated with this column group.voidleftMultByAColGroup(AColGroup lhs, MatrixBlock c)Left side matrix multiplication with a column group that is transposed.voidleftMultByMatrixNoPreAgg(MatrixBlock matrix, MatrixBlock result, int rl, int ru, int cl, int cu)Left multiply with this column group.AColGroupreplace(double pattern, double replace)Make a copy of the column group values, and replace all values that match pattern with replacement value.AColGrouprexpandCols(int max, boolean ignore, boolean cast, int nRows)Expand the column group to multiple columns.AColGrouprightMultByMatrix(MatrixBlock right)Right matrix multiplication with this column group.AColGroupscalarOperation(ScalarOperator op)Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.voidtsmmAColGroup(AColGroup other, MatrixBlock result)Matrix multiply with this other column group, but: 1.AColGroupunaryOperation(UnaryOperator op)- 
Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupCompressedpreAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations
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Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroupcolSum, decompressToDenseBlock, decompressToSparseBlock, estimateInMemorySize, get, getColIndices, getExactSizeOnDisk, getNumCols, readFields, shiftColIndices, sliceColumn, sliceColumns, toString, write
 
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Method Detail- 
createpublic static ColGroupEmpty create(int nCol) 
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getCompTypepublic AColGroup.CompressionType getCompType() Description copied from class:AColGroupObtain the compression type.- Specified by:
- getCompTypein class- AColGroup
- Returns:
- How the elements of the column group are compressed.
 
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getColGroupTypepublic org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType getColGroupType() 
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decompressToDenseBlockpublic void decompressToDenseBlock(DenseBlock target, int rl, int ru, int offR, int offC) Description copied from class:AColGroupDecompress into the DenseBlock. (no NNZ handling)- Specified by:
- decompressToDenseBlockin class- AColGroup
- Parameters:
- target- Target DenseBlock
- rl- Row to start decompression from
- ru- Row to end decompression at
- offR- Row offset into the target to decompress
- offC- Column offset into the target to decompress
 
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decompressToSparseBlockpublic void decompressToSparseBlock(SparseBlock sb, int rl, int ru, int offR, int offC) Description copied from class:AColGroupDecompress into the SparseBlock. (no NNZ handling) Note this method is allowing to calls to append since it is assumed that the sparse column indexes are sorted afterwards- Specified by:
- decompressToSparseBlockin class- AColGroup
- Parameters:
- sb- Target SparseBlock
- rl- Row to start decompression from
- ru- Row to end decompression at
- offR- Row offset into the target to decompress
- offC- Column offset into the target to decompress
 
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getIdxpublic double getIdx(int r, int colIdx)Description copied from class:AColGroupGet the value at a colGroup specific row/column index position.
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scalarOperationpublic AColGroup scalarOperation(ScalarOperator op) Description copied from class:AColGroupPerform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.- Specified by:
- scalarOperationin class- AColGroup
- Parameters:
- op- operation to perform
- Returns:
- version of this column group with the operation applied
 
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unaryOperationpublic AColGroup unaryOperation(UnaryOperator op) - Specified by:
- unaryOperationin class- AColGroup
 
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binaryRowOpLeftpublic AColGroup binaryRowOpLeft(BinaryOperator op, double[] v, boolean isRowSafe) Description copied from class:AColGroupPerform a binary row operation.- Specified by:
- binaryRowOpLeftin class- AColGroup
- Parameters:
- op- The operation to execute
- v- The vector of values to apply, should be same length as dictionary length.
- isRowSafe- True if the binary op is applied to an entire zero row and all results are zero
- Returns:
- A updated column group with the new values.
 
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binaryRowOpRightpublic AColGroup binaryRowOpRight(BinaryOperator op, double[] v, boolean isRowSafe) Description copied from class:AColGroupPerform a binary row operation.- Specified by:
- binaryRowOpRightin class- AColGroup
- Parameters:
- op- The operation to execute
- v- The vector of values to apply, should be same length as dictionary length.
- isRowSafe- True if the binary op is applied to an entire zero row and all results are zero
- Returns:
- A updated column group with the new values.
 
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getNumValuespublic int getNumValues() Description copied from class:AColGroupObtain number of distinct tuples in contained sets of values associated with this column group. If the column group is uncompressed the number or rows is returned.- Specified by:
- getNumValuesin class- AColGroup
- Returns:
- the number of distinct sets of values associated with the bitmaps in this column group
 
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leftMultByAColGrouppublic void leftMultByAColGroup(AColGroup lhs, MatrixBlock c) Description copied from class:AColGroupLeft side matrix multiplication with a column group that is transposed.- Specified by:
- leftMultByAColGroupin class- AColGroup
- Parameters:
- lhs- The left hand side Column group to multiply with, the left hand side should be considered transposed.
- c- The result matrix to insert the result of the multiplication into
 
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tsmmAColGrouppublic void tsmmAColGroup(AColGroup other, MatrixBlock result) Description copied from class:AColGroupMatrix multiply with this other column group, but: 1. Only output upper triangle values. 2. Multiply both ways with "this" being on the left and on the right. It should be guaranteed that the input is not the same as the caller of the method. The second step is achievable by treating the initial multiplied matrix, and adding its values to the correct locations in the output.- Specified by:
- tsmmAColGroupin class- AColGroup
- Parameters:
- other- The other Column group to multiply with
- result- The result matrix to put the results into
 
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leftMultByMatrixNoPreAggpublic void leftMultByMatrixNoPreAgg(MatrixBlock matrix, MatrixBlock result, int rl, int ru, int cl, int cu) Description copied from class:AColGroupLeft multiply with this column group.- Specified by:
- leftMultByMatrixNoPreAggin class- AColGroup
- Parameters:
- matrix- The matrix to multiply with on the left
- result- The result to output the values into, always dense for the purpose of the column groups parallelizing
- rl- The row to begin the multiplication from on the lhs matrix
- ru- The row to end the multiplication at on the lhs matrix
- cl- The column to begin the multiplication from on the lhs matrix
- cu- The column to end the multiplication at on the lhs matrix
 
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copypublic AColGroup copy() Description copied from class:AColGroupGet a copy of this column group note this is only a shallow copy. Meaning only the object wrapping index structures, column indexes and dictionaries are copied.
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containsValuepublic boolean containsValue(double pattern) Description copied from class:AColGroupDetect if the column group contains a specific value.- Specified by:
- containsValuein class- AColGroup
- Parameters:
- pattern- The value to look for.
- Returns:
- boolean saying true if the value is contained.
 
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getNumberNonZerospublic long getNumberNonZeros(int nRows) Description copied from class:AColGroupGet the number of nonZeros contained in this column group.- Specified by:
- getNumberNonZerosin class- AColGroup
- Parameters:
- nRows- The number of rows in the column group, this is used for groups that does not contain information about how many rows they have.
- Returns:
- The nnz.
 
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rightMultByMatrixpublic AColGroup rightMultByMatrix(MatrixBlock right) Description copied from class:AColGroupRight matrix multiplication with this column group. This method can return null, meaning that the output overlapping group would have been empty.- Specified by:
- rightMultByMatrixin class- AColGroup
- Parameters:
- right- The MatrixBlock on the right of this matrix multiplication
- Returns:
- The new Column Group or null that is the result of the matrix multiplication.
 
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replacepublic AColGroup replace(double pattern, double replace) Description copied from class:AColGroupMake a copy of the column group values, and replace all values that match pattern with replacement value.
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getMinpublic final double getMin() Description copied from class:AColGroupShort hand method for getting minimum value contained in this column group.- Overrides:
- getMinin class- AColGroupCompressed
- Returns:
- The minimum value contained in this ColumnGroup
 
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getMaxpublic final double getMax() Description copied from class:AColGroupShort hand method for getting maximum value contained in this column group.- Overrides:
- getMaxin class- AColGroupCompressed
- Returns:
- The maximum value contained in this ColumnGroup
 
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computeColSumspublic void computeColSums(double[] c, int nRows)Description copied from class:AColGroupCompute the column sum- Specified by:
- computeColSumsin class- AColGroup
- Parameters:
- c- The array to add the column sum to.
- nRows- The number of rows in the column group.
 
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centralMomentpublic CM_COV_Object centralMoment(CMOperator op, int nRows) Description copied from class:AColGroupCentral Moment instruction executed on a column group.- Specified by:
- centralMomentin class- AColGroup
- Parameters:
- op- The Operator to use.
- nRows- The number of rows contained in the ColumnGroup.
- Returns:
- A Central Moment object.
 
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rexpandColspublic AColGroup rexpandCols(int max, boolean ignore, boolean cast, int nRows) Description copied from class:AColGroupExpand the column group to multiple columns. (one hot encode the column group)- Specified by:
- rexpandColsin class- AColGroup
- Parameters:
- max- The number of columns to expand to and cutoff values at.
- ignore- If zero and negative values should be ignored.
- cast- If the double values contained should be cast to whole numbers.
- nRows- The number of rows in the column group.
- Returns:
- A new column group containing max number of columns.
 
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getCostpublic double getCost(ComputationCostEstimator e, int nRows) Description copied from class:AColGroupGet the computation cost associated with this column group.
 
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