Production models are models that enable users to take data collected during production and analyze both current production capabilities and predict future production outputs. These are models meant to optimize production and assess performance “pre-release”, meaning they are predictive performance tools. While production models take on many forms, one method of production modeling that is rising in popularity is machine learning algorithms. Machine learning algorithms create production models by learning from past data and then making assessments and predictions on the current production status in light of the lessons learned from the past data.
For the purposes of this article, an example production model will be explored: machine learning for text analysis. This type of machine learning production model takes the form of:
A well-developed and trained production model provides a wealth of benefits; however, these models can just as easily be detrimental. A poorly developed model has the potential to produce misleading, biased, or even nonsense results. The deciding factor in the quality of the production model is the quality of the data used to train it. When producing any machine learning algorithm, the driving question is always going to be what and how much data does the model need to adequately train?
Data needs for text analysis can be broken down as:
In general, more training data is better, and the data needs as much context as possible. Additionally, training data should match the current use case. That is, if the text to be analyzed is a scientific blog post, the training data for the production model should include both scientific articles and related blog posts. The closer the distribution of training data matches the subject matter of the text being analyzed, the better the summary information will be.
Tuning the training data set for a production model is not a trivial task. Not all of the data collected for training will be useful, and down selection is often required. The data needs to be relevant to the text being summarized, but not so specific that it finds a limited subset of relevant information, but also not so vague that it finds too much information. Furthermore, there will always be an imbalance in the training data. Finding a large enough training data set targeted to one specific use case is unlikely, so training data must be balanced across topics to best match the distribution of the topic being studied.
Several pitfalls can be encountered during training data selection, such as:
Finding the right training data set is not a trivial task and will require trade-offs in the amount of training data, relevance of training data, and optimal context.
Finding the right training set and tuning this training set to the given use case can be an expensive and time-consuming task. The cost associated with developing training sets gives rise to the desire to extend training data across applications. Ideally, a production model trained on one set of articles could be extended to other applications. The goal is to collect, organize, and give context to the training data such that it can apply across multiple production model use cases.
However, the new production model cannot understand the context of the old production model. Each new word within the lexicon that has not been trained on by the old model induces a loss of accuracy. Therefore, text analysis production models need to be re-tuned, that is, given a new vocabulary, on which to train. That is not to say, however, that old production models are completely inapplicable to new domains. Several strategies exist to mitigate loss of accuracy across use cases, including:
While production models often carry the name “real-time”, because they leverage the most up-to-date production data available, they can in fact run at many time scales. In practice, different data needs define run-time; for example, a production model may be designed to analyze trends in information, and therefore need days worth of training data. But, once executed, this production model can run in a matter of minutes to analyze new data.
Time latency for text analysis relates to what the expectations are for the model:
Production modeling provides proactive, or predictive, measures of performance. They assess performance “ahead-of-the-curve” to determine how to create a better final product. In the presented case of text analysis, production models predict what information contained within a text article is most relevant to a given application. Once production models have been executed and a product produced, benchmark tests can then be run to assess the value of the final product. Production models provide several key benefits, such as:
As machine learning algorithms become more and more refined, production modeling will become not just a beneficial but a vital tool for production. Therefore, early adoption of production modeling is low risk with the potential of very high rewards, and production models will play a critical role in shaping how production is done in the future.
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