Regression analysis determines the relationship between independent variables and a continuous target variable. It identifies trends and patterns in data to make future predictions or estimate unknown values based on learned relationships.
UNIT1 -Introduction to Machine Learning
Machine Learning is a technique that allows computers to learn from data and make decisions without explicit programming. It works by identifying patterns in data and using them to make predictions. It is used in areas such as:
Image Recognition
Speech Processing
Language Translation
Recommender Systems
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Foundations of supervised learning
Machine learning is a branch of Artificial Intelligence that focuses on developing models and algorithms that let computers learn from data without being explicitly programmed for every task. In simple words, ML teaches systems to think and understand like humans by learning from the data.
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Decision trees and inductive bias
n the realm of machine learning, the concept of inductive bias plays a pivotal role in shaping how algorithms learn from data and make predictions. It serves as a guiding principle that helps algorithms generalize from the training data to unseen data, ultimately influencing their performance and decision-making processes. In this article, we delve into the intricacies of inductive bias, its significance in machine learning, and its implications for model development and interpretation.
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Regression Vs Classification
Classification vs Regression in Machine Learning - To understand how machine learning models make predictions, it᧙s important to know the difference between Classification and Regression. Both are supervised learning techniques, but they solve different types of problems depending on the nature of the target variable.
Classification predicts categories or labels like spam/not spam, disease/no disease, etc.
Regression predicts continuous values like price, temperature, sales, etc.
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Supervised: Linear Regression
Linear Regression in Machine learning Linear Regression is a fundamental supervised learning algorithm used to model the relationship between a dependent variable and one or more independent variables. It predicts continuous values by fitting a straight line that best represents the data.
It assumes that there is a linear relationship between the input and output
Uses a best᧑fit line to make predictions
Commonly used in forecasting, trend analysis, and predictive modelling
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Assignments
Anomaly Detection: Using machine learning algorithms to identify unusual patterns in data that may indicate a security threat.
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UNIT 2 Validation and Testing
. Validation
Validation answers the question:
👉 “Did we build the right model/system?”
It focuses on how well your model performs on unseen data and whether it generalizes.
Key points:
Uses a validation dataset (separate from training data)
Helps tune:
Hyperparameters (e.g., learning rate, model complexity)
Model architecture
Prevents overfitting (model memorizing instead of learning)
Common techniques:
Hold-out validation (train/validation split)
K-fold cross-validation
Stratified sampling (for imbalanced data)
🧪 2. Testing
Testing answers the question:
👉 “Did we build it righ********* evaluates the final model after all tuning is done.
Key points:
Uses a completely independent test dataset
Provides an unbiased estimate of real-world performance
Done only once (ideally)
📊 Typical Workflow
Split dataset
Training set (e.g., 70%)
Validation set (e.g., 15%)
Test set (e.g., 15%)
Train model
Fit on training data
Validate
Tune parameters using validation set
Test
Final evaluation using test set
⚖️ Key Differences
Aspect Validation Testing
Purpose Model tuning & selection Final evaluation
Data used Validation set Test set
Frequency Multiple times Once (or very few times)
Risk Overfitting to validation Must remain unbiased
🚨 Common Pitfalls
❌ Using test data during training → leads to data leakage
❌ Over-tuning on validation set → poor real-world performance
❌ Small datasets → unreliable results
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UNIT 3: Advanced supervised learning
Advanced supervised learning refers to improved techniques and models that enhance prediction accuracy, handle complex datasets, and solve real-world machine learning problems efficiently. It goes beyond basic algorithms like linear regression and simple decision trees.
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UNIT 4: Markov model
A Markov Model is a probabilistic model used to represent systems that change over time, where the future state depends only on the current state and not on the past states.
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