org.apache.mahout.math.decompositions

DQR

object DQR

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  8. def dqrThin[K](drmA: DrmLike[K], checkRankDeficiency: Boolean = true, cacheHint: CacheHint = CacheHint.MEMORY_ONLY): (DrmLike[K], Matrix)

    Distributed _thin_ QR.

    Distributed _thin_ QR. A'A must fit in a memory, i.e. if A is m x n, then n should be pretty controlled (<5000 or so). <P>

    It is recommended to checkpoint A since it does two passes over it. <P>

    It also guarantees that Q is partitioned exactly the same way (and in same key-order) as A, so their RDD should be able to zip successfully.

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