What is underfitting in machine learning


Are you tired of your machine learning models performing poorly on new data? Have you ever heard the term “underfitting” and wondered what it means? Well, look no further! In this blog post, we will break down exactly what underfitting is in machine learning and how it can be detrimental to your model’s performance. So, buckle up and get ready to learn about one of the most common pitfalls in the world of artificial intelligence!

What is Underfitting in Machine Learning?

Underfitting is a common problem that can arise in machine learning models. Underfitting occurs when the model does not fit the data well, and this can cause problems for the model’s performance. There are several causes of underfitting, and it can be difficult to diagnose and fix. Here are some tips for mitigating underfitting in your models:

1) Ensure that your data is appropriately matched to the model you are utilizing. A properly trained model will only work well on data that matches its specifications. If your data isn’t appropriate, your model will likely underfit it.

2) Test your models frequently. Use benchmarking tools or metrics to measure how well your models perform on different types of data. This practice will assist you in pinpointing which models are delivering the best performance and in identifying areas where improvements are necessary.

3) Reduce variance in your data. You can typically achieve this by reducing the number of features or training samples utilized in a model. When all the features in a dataset are considered equally important, each instance of a feature will be included in the prediction equation, resulting in high variance. Reducing variance by selecting more relevant features can help improve accuracy while minimizing underfitting.

Types of Underfitting

There are a few types of underfitting in machine learning:

  1. Underfitting due to lack of data: This is the most common type of underfitting and often occurs when there is not enough data to train the model on. The model will not be able to accurately predict the behavior of data that it has not seen before.
  2. Underfitting can occur due to insufficient feature selection. This situation arises when there is either an overabundance of selected features or when the chosen features are not well-suited for the given task. When an excessive number of features are chosen, the model attempts to learn from all of them, even those that are irrelevant for predicting the target variable. On the contrary, if features are inadequately selected, the model relies exclusively on those that appear relevant, which may result in inaccurate predictions.
  3. Overfitting: This happens when the model becomes so complex that it can no longer generalize well from examples it has seen before. Overfitting means that the model is able to predict patterns in data that actually do not exist in reality. This can lead to incorrect predictions and reduced accuracy over time.

How to Reduce Underfitting in Machine Learning

In machine learning, underfitting occurs when a model is unable to generalize effectively from the provided data. This can lead to worse learner performance and decreased accuracy. There are various ways to reduce underfitting in machine learning models, including:

1) Segmenting the data into random and test sets: By splitting the data into two sets, you can provide a more accurate estimate of how well your model will perform on this particular dataset. This helps prevent overfitting, a situation in which a model generalizes excessively from the data it has been provided.

2) Using a larger training set: A larger training set allows for a model to learn more about how the data behaves. As a result, it will become better equipped to make generalizations from this data in the future.

3) Trying different hyperparameters: Some parameters in machine learning models can play an important role in determining how well the model will perform. By adjusting these parameters, you can often improve learner performance and accuracy.


In this article, we will explore what underfitting is and how it can affect your machine-learning models. We will also provide some tips on how to deal with underfitting in your models. Hopefully, this article has helped you understand what underfitting is and the importance of dealing with it before it leads to problems in your models.


What is underfitting in machine learning?

Underfitting occurs when a machine learning model is too simple to capture the underlying patterns in the data. It performs poorly on both the training data and unseen test data because it fails to model the complexity of the data.

What are the common causes of underfitting?

Underfitting can be caused by using a model that is too simple, having too few features, using insufficient data, or over-regularizing the model.

How can I identify if my model is underfitting?

You can identify underfitting by evaluating the model’s performance on training and validation datasets. If both the training error and validation error are high, it indicates that the model is underfitting.

What are some solutions to address underfitting?

To address underfitting, you can increase the model complexity by adding more features, selecting a more complex model, decreasing regularization, or providing the model with more training data.

How does underfitting differ from overfitting in machine learning?

Underfitting occurs when a model is too simple to capture the data patterns, leading to poor performance on both training and test data. Overfitting, on the other hand, happens when a model is too complex and captures noise along with the data patterns, leading to good performance on training data but poor performance on test data.

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