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
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Nested classes/interfaces inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup
AColGroup.CompressionType
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Constructor Summary
Constructors Constructor Description ColGroupEmpty(int[] colIndices)Constructs an Constant Colum Group, that contains only one tuple, with the given value.
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Method Summary
All 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.AColGroupCompressed
preAggRows, tsmm, unaryAggregateOperations, unaryAggregateOperations
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Methods inherited from class org.apache.sysds.runtime.compress.colgroup.AColGroup
colSum, decompressToDenseBlock, decompressToSparseBlock, estimateInMemorySize, get, getColIndices, getExactSizeOnDisk, getNumCols, readFields, shiftColIndices, sliceColumn, sliceColumns, toString, write
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Method Detail
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create
public static ColGroupEmpty create(int nCol)
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getCompType
public AColGroup.CompressionType getCompType()
Description copied from class:AColGroupObtain the compression type.- Specified by:
getCompTypein classAColGroup- Returns:
- How the elements of the column group are compressed.
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getColGroupType
public org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType getColGroupType()
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decompressToDenseBlock
public 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 classAColGroup- Parameters:
target- Target DenseBlockrl- Row to start decompression fromru- Row to end decompression atoffR- Row offset into the target to decompressoffC- Column offset into the target to decompress
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decompressToSparseBlock
public 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 classAColGroup- Parameters:
sb- Target SparseBlockrl- Row to start decompression fromru- Row to end decompression atoffR- Row offset into the target to decompressoffC- Column offset into the target to decompress
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getIdx
public 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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scalarOperation
public 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 classAColGroup- Parameters:
op- operation to perform- Returns:
- version of this column group with the operation applied
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unaryOperation
public AColGroup unaryOperation(UnaryOperator op)
- Specified by:
unaryOperationin classAColGroup
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binaryRowOpLeft
public AColGroup binaryRowOpLeft(BinaryOperator op, double[] v, boolean isRowSafe)
Description copied from class:AColGroupPerform a binary row operation.- Specified by:
binaryRowOpLeftin classAColGroup- Parameters:
op- The operation to executev- 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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binaryRowOpRight
public AColGroup binaryRowOpRight(BinaryOperator op, double[] v, boolean isRowSafe)
Description copied from class:AColGroupPerform a binary row operation.- Specified by:
binaryRowOpRightin classAColGroup- Parameters:
op- The operation to executev- 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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getNumValues
public 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 classAColGroup- Returns:
- the number of distinct sets of values associated with the bitmaps in this column group
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leftMultByAColGroup
public void leftMultByAColGroup(AColGroup lhs, MatrixBlock c)
Description copied from class:AColGroupLeft side matrix multiplication with a column group that is transposed.- Specified by:
leftMultByAColGroupin classAColGroup- 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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tsmmAColGroup
public 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 classAColGroup- Parameters:
other- The other Column group to multiply withresult- The result matrix to put the results into
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leftMultByMatrixNoPreAgg
public 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 classAColGroup- Parameters:
matrix- The matrix to multiply with on the leftresult- The result to output the values into, always dense for the purpose of the column groups parallelizingrl- The row to begin the multiplication from on the lhs matrixru- The row to end the multiplication at on the lhs matrixcl- The column to begin the multiplication from on the lhs matrixcu- The column to end the multiplication at on the lhs matrix
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copy
public 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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containsValue
public boolean containsValue(double pattern)
Description copied from class:AColGroupDetect if the column group contains a specific value.- Specified by:
containsValuein classAColGroup- Parameters:
pattern- The value to look for.- Returns:
- boolean saying true if the value is contained.
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getNumberNonZeros
public long getNumberNonZeros(int nRows)
Description copied from class:AColGroupGet the number of nonZeros contained in this column group.- Specified by:
getNumberNonZerosin classAColGroup- 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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rightMultByMatrix
public 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 classAColGroup- 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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replace
public 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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getMin
public final double getMin()
Description copied from class:AColGroupShort hand method for getting minimum value contained in this column group.- Overrides:
getMinin classAColGroupCompressed- Returns:
- The minimum value contained in this ColumnGroup
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getMax
public final double getMax()
Description copied from class:AColGroupShort hand method for getting maximum value contained in this column group.- Overrides:
getMaxin classAColGroupCompressed- Returns:
- The maximum value contained in this ColumnGroup
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computeColSums
public void computeColSums(double[] c, int nRows)Description copied from class:AColGroupCompute the column sum- Specified by:
computeColSumsin classAColGroup- Parameters:
c- The array to add the column sum to.nRows- The number of rows in the column group.
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centralMoment
public CM_COV_Object centralMoment(CMOperator op, int nRows)
Description copied from class:AColGroupCentral Moment instruction executed on a column group.- Specified by:
centralMomentin classAColGroup- Parameters:
op- The Operator to use.nRows- The number of rows contained in the ColumnGroup.- Returns:
- A Central Moment object.
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rexpandCols
public 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 classAColGroup- 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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getCost
public double getCost(ComputationCostEstimator e, int nRows)
Description copied from class:AColGroupGet the computation cost associated with this column group.
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