Artificial Intelligence :Supervised Learning
Supervised learning is a type of machine learning that involves using labeled data to train a model to make predictions or decisions. The goal of supervised learning is to learn a function that maps input data (also known as features) to output data (also known as labels or targets). Once the model is trained, it can be used to predict the label of new, unseen input data.
Supervised learning can be divided into two main categories: regression and classification. In regression problems, the goal is to predict a continuous value, such as the price of a stock or the temperature of a room. In classification problems, the goal is to predict a discrete label, such as whether an image contains a dog or a cat.
The process of supervised learning begins with collecting labeled training data. This data is typically represented as a table, where each row corresponds to a single example, and each column corresponds to a feature or label. The training data is then used to train a model, which can be thought of as a function that takes in input data and produces output data. There are many different types of models that can be used for supervised learning, including linear regression, logistic regression, decision trees, and neural networks.
Once the model is trained, it can be evaluated on a separate set of test data to see how well it generalizes to new examples. This is known as testing the model. The performance of the model on the test data is a good indicator of how well the model will perform on unseen data in the future.
The process of supervised learning can be broken down into several steps:
Collect and prepare labeled training data
Choose a model and train it on the training data
Evaluate the model on a separate set of test data
Use the model to make predictions on new, unseen data
Supervised learning is a powerful technique that can be used to solve a wide variety of problems, such as image classification, natural language processing, and speech recognition. It is also the foundation of many practical applications, such as self-driving cars, medical diagnosis systems, and recommendation systems.
However, supervised learning also has some limitations. One limitation is that the model can only make predictions based on the features and labels that are present in the training data. This means that the model may not be able to generalize to new examples that have different features or labels. Another limitation is that the model can only make predictions based on the relationships that it has learned from the training data. This means that the model may not be able to make accurate predictions in situations where the relationships between the features and labels are different from those in the training data.
In summary, supervised learning is a powerful and widely used technique for solving problems that involve making predictions or decisions based on input data. It involves using labeled training data to train a model, which can then be used to make predictions on new, unseen data. Despite its limitations, supervised learning is a powerful technique that is used in many practical applications.
Sample Python 3.10 program to explain supervised learning :
from sklearn import datasets
from sklearn.model_selection import train_test_split
from sklearn.linear_model import LinearRegression
# Load the diabetes dataset
diabetes = datasets.load_diabetes()
# Split the data into training and test sets
X_train, X_test, y_train, y_test = train_test_split(diabetes.data, diabetes.target, test_size=0.2)
# Create a linear regression model
model = LinearRegression()
# Train the model on the training data
model.fit(X_train, y_train)
# Evaluate the model on the test data
score = model.score(X_test, y_test)
print("Test score: {:.2f}".format(score))
Explanation:
This program first imports the necessary libraries and loads the diabetes dataset using the scikit-learn's datasets module. Then, it splits the data into training and test sets using the train_test_split function. Then, it creates a linear regression model and trains it on the training data using the .fit() method. Finally, it evaluates the model on the test data by calling the .score() method and prints the result.
It is a simple example of supervised learning where the model is trained on the labeled data and then tested for its accuracy on unseen data.