write CSV
  fun <T, D : Dim2> Multik.writeCSV(    writer: Appendable,     ndarray: NDArray<T, D>,     format: CSVFormat = CSVFormat.DEFAULT)
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Returns an NDArray of type T and D dimension read from csv file.
Parameters
T
NDArray element type
D
dimension of NDArray. It can be 1 or 2
writer
ndarray
array of data
format
csv format from apache