They are challenging to model, difficult to scale, and painful to integrate. Credit https://www.nousot.com/resources/using-genai-to-completely-disrupt-traditional-platform-migrations-to-databricks-2/
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The Wasserstein or Earth Moving Metric looks at how much energy is required to reshape the predicted forecast into the actual data. For a lot of demand forecasting use cases, like inventory management, being close, say within a day, is usually pretty good and within the tolerances of the system, making Wasserstein distance a good choice.
If the demand is too random, there is sometimes nothing better than a flat line of zeroes, or ones. However, most clients/stakeholders do not like flat lines for forecasts.
Statistical, machine learning, and deep learning forecasting approaches each have their own unique pros and cons