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Diffstat (limited to 'docs/ml-features.md')
| -rw-r--r-- | docs/ml-features.md | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/ml-features.md b/docs/ml-features.md index d82c85ee75..8d56dc32ca 100644 --- a/docs/ml-features.md +++ b/docs/ml-features.md @@ -725,7 +725,11 @@ dctDf.select("featuresDCT").show(3); `StringIndexer` encodes a string column of labels to a column of label indices. The indices are in `[0, numLabels)`, ordered by label frequencies. So the most frequent label gets index `0`. -If the input column is numeric, we cast it to string and index the string values. +If the input column is numeric, we cast it to string and index the string +values. When downstream pipeline components such as `Estimator` or +`Transformer` make use of this string-indexed label, you must set the input +column of the component to this string-indexed column name. In many cases, +you can set the input column with `setInputCol`. **Examples** |