Github user AnthonyTruchet commented on the issue:
https://github.com/apache/spark/pull/16037
@MLnick I have to add a transtyping denseGrad in the expression returned by
seqOp from DenseVector to Vector. The only way I could find to do it with the
API are: `Vectors.fromBreeze(denseGrad.asBreeze)` or
`Vectors.dense(denseGrad.values)`: I'm a biut concerned with the potential
recopy of a 128MB piece of memory...
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