@lanking520 may be just printing the NDArray metadata in toString might be 
suffient
`(x.shape, x.size, x.dtype, x.context)`
* What is the use-case you are trying to solve with toString() ?
* I don't think you should threshold on maxLength in toArray(), it will be 
confusing. there might be genuine cases where you want to move from 
Off-Heap(NDArray) to JVM Heap(Array[Float])



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