[ML] Optimize inference step when there are no test docs #74315
Merged
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In data frame analytics, when the analysis supports inference,
training_percent
is set to100
, and there are no test docs(i.e. docs missing a value for their dependent variable),
there is no need to load the model in memory only to realize
there are no documents to run inference on.
This commit optimizes the inference step in this scenario.