org.apache.mahout.math.indexeddataset

Reader

trait Reader[T] extends AnyRef

Reader trait is abstract in the sense that the elementReader and rowReader functions must be supplied by an extending trait, which also defines the type to be read.

T

type of object to read.

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  1. abstract def elementReader(mc: DistributedContext, readSchema: Schema, source: String, existingRowIDs: Option[BiDictionary] = None): T

    Override in extending trait to supply T and perform a parallel read of collection elements

    Override in extending trait to supply T and perform a parallel read of collection elements

    mc

    a org.apache.mahout.math.drm.DistributedContext to read from

    readSchema

    map of parameters controlling formating and how the read is executed

    source

    list of comma delimited files to read from

    existingRowIDs

    indexeddataset.BiDictionary containing row IDs that have already been applied to this collection--used to synchronize row IDs between several collections

    returns

    a new collection of type T

    Attributes
    protected
  2. abstract val mc: DistributedContext

  3. abstract val readSchema: Schema

  4. abstract def rowReader(mc: DistributedContext, readSchema: Schema, source: String, existingRowIDs: Option[BiDictionary] = None): T

    Override in extending trait to supply T and perform a parallel read of collection rows

    Override in extending trait to supply T and perform a parallel read of collection rows

    mc

    a org.apache.mahout.math.drm.DistributedContext to read from

    readSchema

    map of parameters controlling formating and how the read is executed

    source

    list of comma delimited files to read from

    existingRowIDs

    indexeddataset.BiDictionary containing row IDs that have already been applied to this collection--used to synchronize row IDs between several collections

    returns

    a new collection of type T

    Attributes
    protected

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  16. final def notifyAll(): Unit

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  17. def readElementsFrom(source: String, existingRowIDs: Option[BiDictionary] = None): T

    Public method called to perform the element-wise read.

    Public method called to perform the element-wise read. Usually no need to override

    source

    comma delimited URIs to read from

    existingRowIDs

    a indexeddataset.BiDictionary containing previously used id mappings--used to synchronize all row ids is several collections

    returns

    a new collection of type T

  18. def readRowsFrom(source: String, existingRowIDs: Option[BiDictionary] = None): T

    Public method called to perform the row-wise read.

    Public method called to perform the row-wise read. Usually no need to override.

    source

    comma delimited URIs to read from

    existingRowIDs

    a indexeddataset.BiDictionary containing previously used id mappings--used to synchronize all row ids is several collections

    returns

    a new collection of type T

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