[R] Support multi-class custom objective. #9526
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Currently, the gradient is passed as a numeric vector. We will enforce it to be a matrix instead. Correctly handle the f-order of R matrix.
This was referenced Aug 27, 2023
trivialfis
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trivialfis
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hcho3
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Aug 28, 2023
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Currently, the gradient is passed as a numeric vector. We will enforce it to be a matrix instead.
Correctly handle the f-order of R matrix.