Ryan Avery created SPARK-46948:
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             Summary: Support higher dimensional array return values in 
predict_batch_udf beyond 1 or 2 dimensional arrays
                 Key: SPARK-46948
                 URL: https://issues.apache.org/jira/browse/SPARK-46948
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 3.5.0
            Reporter: Ryan Avery


pyspark.ml.functions.predict_batch_udf does not support return types with more 
than 2 dimensions:

[https://github.com/apache/spark/pull/37734#discussion_r1016156053]


Many computer vision models return ndarrays with 3 or 4 dimensions. 
Segmentation returns 3 dimensions: [Category, H, W]and if there is a time 
dimension, that's the fourth dimension.



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