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https://issues.apache.org/jira/browse/SPARK-43298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17716962#comment-17716962
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Snoot.io commented on SPARK-43298:
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User 'leewyang' has created a pull request for this issue:
https://github.com/apache/spark/pull/40967
> predict_batch_udf with scalar input fails when batch size consists of a
> single value
> ------------------------------------------------------------------------------------
>
> Key: SPARK-43298
> URL: https://issues.apache.org/jira/browse/SPARK-43298
> Project: Spark
> Issue Type: Bug
> Components: ML, PySpark
> Affects Versions: 3.4.0
> Reporter: Lee Yang
> Priority: Major
>
> This is related to SPARK-42250. For scalar inputs, the predict_batch_udf
> will fail if the batch size is 1:
> {code:java}
> import numpy as np
> from pyspark.ml.functions import predict_batch_udf
> from pyspark.sql.types import DoubleType
> df = spark.createDataFrame([[1.0],[2.0]], schema=["a"])
> def make_predict_fn():
> def predict(inputs):
> return inputs
> return predict
> identity = predict_batch_udf(make_predict_fn, return_type=DoubleType(),
> batch_size=1)
> preds = df.withColumn("preds", identity("a")).collect()
> {code}
> fails with:
> {code:java}
> File "/.../spark/python/pyspark/worker.py", line 869, in main
> process()
> File "/.../spark/python/pyspark/worker.py", line 861, in process
> serializer.dump_stream(out_iter, outfile)
> File "/.../spark/python/pyspark/sql/pandas/serializers.py", line 354, in
> dump_stream
> return ArrowStreamSerializer.dump_stream(self,
> init_stream_yield_batches(), stream)
> File "/.../spark/python/pyspark/sql/pandas/serializers.py", line 86, in
> dump_stream
> for batch in iterator:
> File "/.../spark/python/pyspark/sql/pandas/serializers.py", line 347, in
> init_stream_yield_batches
> for series in iterator:
> File "/.../spark/python/pyspark/worker.py", line 555, in func
> for result_batch, result_type in result_iter:
> File "/.../spark/python/pyspark/ml/functions.py", line 818, in predict
> yield _validate_and_transform_prediction_result(
> File "/.../spark/python/pyspark/ml/functions.py", line 339, in
> _validate_and_transform_prediction_result
> if len(preds_array) != num_input_rows:
> TypeError: len() of unsized object
> {code}
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