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In a world of artificial intelligence (AI), data serves as the foundation for machine learning (ML) models to identify trends and patterns, which it then uses to make predictions and decisions based on new, unseen data. The more data the model is trained on, the more accurate it can become in predicting outcomes or making decisions.
But just having a lot of data is not sufficient for training a good model. The saying “garbage in, garbage out” is a well-known concept in computing, indicating that flawed input data or instructions will generate flawed outputs.
Data quality concerns are frequently overlooked in ML research and education, with major textbooks focusing on the mathematical foundation of ML and using clean, organized, and pre-labeled “toy” datasets.
Despite this, implementing ML in a particular domain has to take into account that real-world data is flawed. This is a fact that any ML engineer or Data Scientist who works with productionalizing ML models is well-versed in, as most of the challenges in creating ML models that output quality results are data-related.
In this article, we will explore:
Put simply, an ML model is a combination of a dataset and the algorithm used to train on that particular dataset. So, the same algorithm trained on different datasets will produce very different results.
An ML model does need a fair amount of examples from which it can learn. Depending on the complexity of the problem that they are trying to solve, machine learning models require different volumes of data, spanning from hundreds of data points for modeling a single user profile to millions of data points for language or computer vision models.
In general, the more complex the problem, the more data the model will need to learn and make accurate predictions. Additionally, if the data is noisy or contains many outliers, the model may require more data to filter out these anomalies.
When a model is trained on a limited amount of data, it may not have enough examples to accurately generalize to new data, resulting in overfitting or underfitting — basically the ML model learns the dataset “by heart” or fails to capture the underlying patterns in the data, resulting in poor performance when predictions are generated.
Having more data is not always better, as the quality of the data is equally important. Poor quality data can negatively impact the performance of the model, even if there is a large amount of it.
The accuracy of the model’s predictions is highly dependent on the quality of the data it has been trained on. If the data is noisy, inconsistent, or contains errors, the model is likely to learn and propagate these errors, resulting in inaccurate predictions. As an example, consider a model that is trained to distinguish between pictures of cats and dogs. Having 5% of the data wrongly labeled as dogs when they are in fact cats will result in about a 5% error rate increase for that class on unseen data. Real data (be it collected or human annotated) can contain bugs and errors that may lead to uncertainty or mistakes at inference time.
To give another example: the ML architecture, data and techniques to train a model like ChatGPT have been public for a few years. However, a lot of engineering time went into producing a usable product. One key ingredient, or “secret sauce” if you will, has been the quality of the data: the curation of incorrect and duplicate data from the internet, plus the human annotated instruction/chat-like fine-tuning.
In ML, there is often a trade-off between the quantity and quality of data. More data can lead to better performance of an ML model, but only if that data is of high quality meaning correct and diverse. On the other hand, even a small amount of high-quality data can produce a useful machine learning model, but only if the model is not too complex. For such cases, you can also use extrapolations to generate more data out of a small, quality dataset.
A few considerations to keep in mind when searching for the balance between the amount and quality of data:
Therefore, it is important to consider the specific task and context and determine the appropriate amount and quality of data required for building a successful machine learning model.
When going into data collection with the purpose of developing a ML model, start by asking yourself the following questions:
The required volume of data depends on the complexity of the problem you are trying to solve, but if your dataset is less than a few thousand entries, a ML model might not be a good solution for your use case. Could the problem be solved using rules?
In addition, quality data is crucial for ensuring the accuracy and fairness of machine learning models. So plan to carefully curate, preprocess and validate it, thus ensuring it meets the necessary standards for the problem being solved.
At Algolia, customers can benefit from state-of-the-art AI search, while also benefiting from Algolia’s renowned performance, reliability and quality. All the AI training and management – from the selection of ML models, to their deployment, monitoring and optimization over time – is handled by Algolia. Learn more about Algolia NeuralSearch.
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