Data Science & Machine Learning

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1. Compare SVM and Logistic Regression in handling outliers For Logistic Regression, outliers can have an unusually large effect on the estimate of logistic regression coefficients. It will find a linear boundary if it exists to accommodate the outliers. To solve the problem of outliers, sometimes a sigmoid function is used in logistic regression. For SVM, outliers can make the decision boundary deviate severely from the optimal hyperplane. One way for SVM to get around the problem is to introduce slack variables. There is a penalty involved with using slack variables, and how SVM handles outliers depends on how this penalty is imposed. 2. Can you explain how to implement a simple kNN algorithm in code? The kNN algorithm can be used for a variety of tasks (classification & regression). To implement it, you will need to first calculate the distance between the new data point and all of the training data points. Once you have the distances, you will then need to find the k nearest neighbors and take the majority vote of those neighbors to determine the class of the new data point. 3. What type of node is considered Pure in the decision tree? If the Gini Index of the data is 0 then it means that all the elements belong to a specific class. When this happens it is said to be pure. When all of the data belongs to a single class (pure) then the leaf node is reached in the tree. The leaf node represents the class label in the tree (which means that it gives the final output). 4. What is Space and Time Complexity of the Hierarchical Clustering Algorithm? Space complexity: Hierarchical Clustering Technique requires very high space when the number of observations in our dataset is more since we need to store the similarity matrix in the RAM. So, the space complexity is the order of the square of n. Space complexity = O(n²) where n is the number of observations. Time complexity: Since we have to perform n iterations and in each iteration, we need to update the proximity matrix and also restore that matrix, therefore the time complexity is also very high. So, the time complexity is the order of the cube of n. Time complexity = O(n³) where n is the number of observations. ENJOY LEARNING 👍👍

Commonly used Python libraries are: 👉🏻NumPy: This library is used for scientific computing and working with arrays of data. It provides functions for working with arrays of data, including mathematical operations, linear algebra, and random number generation. 👉🏻Pandas: This library is used for data manipulation and analysis. It provides tools for importing, cleaning, and transforming data, as well as tools for working with time series data and performing statistical analysis. 👉🏻Matplotlib: This library is used for data visualization. It provides functions for creating a wide range of plots, including scatter plots, line plots, bar plots, and histograms. 👉🏻Scikit-learn: This library is used for machine learning. It provides a range of algorithms for classification, regression, clustering, and dimensionality reduction, as well as tools for model evaluation and selection. 👉🏻TensorFlow: This library is used for deep learning. It provides a range of tools and libraries for building and training neural networks, including support for distributed training and hardware acceleration.

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An high level overview for becoming a machine learning engineer