Return sizes of each partition of the input distributed object.
input distributed object
a numeric vector or list containing the indices of the partitions. Default is NULL.
A matrix that denotes the number of rows and columns in the partition. Row i of the matrix corresponds or size of i'th partition. For a dlist, the returned matrix has only 1 column.
Prasad, S., Fard, A., Gupta, V., Martinez, J., LeFevre, J., Xu, V., Hsu, M., Roy, I. Large scale predictive analytics in Vertica: Fast data transfer, distributed model creation and in-database prediction. _Sigmod 2015_, 1657-1668.
Venkataraman, S., Bodzsar, E., Roy, I., AuYoung, A., and Schreiber, R. (2013) Presto: Distributed Machine Learning and Graph Processing with Sparse Matrices. _EuroSys 2013_, 197-210.
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