Supervised Learning is a paradigm within Machine Learning where an algorithm is trained to learn a mapping from input features to a specific output label or value, based on a dataset in which the true output values are known. Essentially, the algorithm is provided with example inputs along with the corresponding correct outputs, and it learns to make predictions or decisions based on this information.
The term ‘supervised’ refers to the fact that the learning process is guided or supervised by providing the algorithm with explicit examples of what the correct output should be for different inputs. The dataset used for training is called the ‘training set,’ and each example in the training set is called a ‘training example’ or ‘sample’.
Supervised Learning can be further categorized into two main types:
Classification: In classification, the output variable is a category or a label. The algorithm is trained to classify input examples into one of the predefined categories. For instance, an email can be classified as ‘spam’ or ‘not spam’.
Regression: In regression, the output variable is a continuous value. The algorithm is trained to predict a quantity. For example, predicting the price of a house based on features like size, location, and number of bedrooms.
The process of supervised learning involves several steps:
- Collecting Data: Gathering a labeled dataset with input-output pairs.
- Training the Model: Feeding the dataset into the algorithm to allow it to learn the relationships between the input and output.
- Evaluating the Model: Testing the model on a separate dataset (not used in training) to evaluate its performance.
- Making Predictions: Using the trained model to make predictions on new, unseen data.
- Model Tuning: Adjusting parameters or choosing a different algorithm to improve performance if necessary.
It is crucial to ensure that the training data is representative of the real-world situations where the model will be applied, and to be mindful of issues such as overfitting, where the model learns the training data too well and does not generalize effectively to new data.”« Back to Glossary Index