Data Science & Machine Learning

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DATA SCIENCE INTERVIEW QUESTIONS WITH ANSWERS 1. What is a logistic function? What is the range of values of a logistic function? f(z) = 1/(1+e -z ) The values of a logistic function will range from 0 to 1. The values of Z will vary from -infinity to +infinity. 2. What is the difference between R square and adjusted R square? R square and adjusted R square values are used for model validation in case of linear regression. R square indicates the variation of all the independent variables on the dependent variable. i.e. it considers all the independent variable to explain the variation. In the case of Adjusted R squared, it considers only significant variables(P values less than 0.05) to indicate the percentage of variation in the model. Thus Adjusted R2 is always lesser then R2. 3. What is stratify in Train_test_split? Stratification means that the train_test_split method returns training and test subsets that have the same proportions of class labels as the input dataset. So if my input data has 60% 0's and 40% 1's as my class label, then my train and test dataset will also have the similar proportions. 4. What is Backpropagation in Artificial Neuron Network? Backpropagation is the method of fine-tuning the weights of a neural network based on the error rate obtained in the previous epoch (i.e., iteration). Proper tuning of the weights allows you to reduce error rates and make the model reliable by increasing its generalization. ENJOY LEARNING 👍👍

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What 𝗠𝗟 𝗰𝗼𝗻𝗰𝗲𝗽𝘁𝘀 are commonly asked in 𝗱𝗮𝘁𝗮 𝘀𝗰𝗶𝗲𝗻𝗰𝗲 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝘀? These are fair game in interviews at 𝘀𝘁𝗮𝗿𝘁𝘂𝗽𝘀, 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗶𝗻𝗴 & 𝗹𝗮𝗿𝗴𝗲 𝘁𝗲𝗰𝗵. 𝗙𝘂𝗻𝗱𝗮𝗺𝗲𝗻𝘁𝗮𝗹𝘀 - Supervised vs. Unsupervised Learning - Overfitting and Underfitting - Cross-validation - Bias-Variance Tradeoff - Accuracy vs Interpretability - Accuracy vs Latency 𝗠𝗟 𝗔𝗹𝗴𝗼𝗿𝗶𝘁𝗵𝗺𝘀 - Logistic Regression - Decision Trees - Random Forest - Support Vector Machines - K-Nearest Neighbors - Naive Bayes - Linear Regression - Ridge and Lasso Regression - K-Means Clustering - Hierarchical Clustering - PCA 𝗠𝗼𝗱𝗲𝗹𝗶𝗻𝗴 𝗦𝘁𝗲𝗽𝘀 - EDA - Data Cleaning (e.g. missing value imputation) - Data Preprocessing (e.g. scaling) - Feature Engineering (e.g. aggregation) - Feature Selection (e.g. variable importance) - Model Training (e.g. gradient descent) - Model Evaluation (e.g. AUC vs Accuracy) - Model Productionization 𝗛𝘆𝗽𝗲𝗿𝗽𝗮𝗿𝗮𝗺𝗲𝘁𝗲𝗿 𝗧𝘂𝗻𝗶𝗻𝗴 - Grid Search - Random Search - Bayesian Optimization 𝗠𝗟 𝗖𝗮𝘀𝗲𝘀 - [Capital One] Detect credit card fraudsters - [Amazon] Forecast monthly sales - [Airbnb] Estimate lifetime value of a guest Like if you need similar content 😄👍

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Artificial Intelligence vs Microsoft Excel ✅

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