infer labels in LabelCountCollector
#351
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…ons if labels are inferred from data
…ons if labels are inferred from data
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With this PR, we allow
labels = "INFERRED"in which case the labels are inferred from the data. This also adds the parameterlabel_attribute.IMPORTANT NOTE: Inferring labels produces wrong results for certain
aggregation_functionssuch asmin,mean, andstdbecause documents with zero entries of a certain label are not considered anymore for that label. We remove these fromaggregation_functionsiflabels == "INFERRED", but we can not handle any user defined function (which relies on correct zero values).