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Creates a _TargetColumn for linear regression. (deprecated)

label_name String, name of the key in label dict. Can be null if label is a tensor (single headed models).
weight_column_name A string defining feature column name representing weights. It is used to down weight or boost examples during training. It will be multiplied by the loss of the example.
label_dimension dimension of the target for multilabels.

An instance of _TargetColumn