Fixes multiclass logistic regression#4963
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src/Microsoft.ML.StandardTrainers/Standard/LogisticRegression/MulticlassLogisticRegression.cs
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Fixes dimension bug for MulticlassLogisticRegression and SdcaMaximumEntropy in Nimbus (microsoft/NimbusML#473)
Unsqueeze was adding dimension 0 to the label tensor - to get shape (1,#samples), instead of the expected shape (#samples, 1).