Why does loading a Dataset with Azure ML Studio's built-in Dataset Loader containing records defined on multiple rows take longer than loading a Dataset of equivalent size but containing only records defined on rows? unique lines?

Question

Accepted Answer

With a Dataset containing multi-lines, the use of several CPUs becomes impossible with the tool for loading Datasets integrated into Azure ML Studio.

Answer

No, loading a Dataset containing multi-lines does not take longer than loading any other Dataset.

Answer

Because loading a Dataset containing multlines requires heavier algorithms.

Question from the Azure Machine Learning Studio test

Why does loading a Dataset with Azure ML Studio's built-in Dataset Loader containing records defined on multiple rows take longer than loading a Dataset of equivalent size but containing only records defined on rows? unique lines?