-Time series data can be large due to the number of series in the data, the number of historical observations, or both. **Many models** and hierarchical time series, or **HTS**, are scaling solutions for the former scenario, where the data consists of a large number of time series. In these cases, it can be beneficial for model accuracy and scalability to partition the data into groups and train a large number of independent models in parallel on the groups. Conversely, there are scenarios where one or a small number of high-capacity models is better. **Distributed DNN training** targets this case. We review concepts around these scenarios in the remainder of the article.
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