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Top 10 machine Learning algorithms

1. Linear Regression: Linear regression is a simple and commonly used algorithm for predicting a continuous target variable based on one or more input features. It assumes a linear relationship between the input variables and the output.

2. Logistic Regression: Logistic regression is used for binary classification problems where the target variable has two classes. It estimates the probability that a given input belongs to a particular class.

3. Decision Trees: Decision trees are a popular algorithm for both classification and regression tasks. They partition the feature space into regions based on the input variables and make predictions by following a tree-like structure.

4. Random Forest: Random forest is an ensemble learning method that combines multiple decision trees to improve prediction accuracy. It reduces overfitting and provides robust predictions by averaging the results of individual trees.

5. Support Vector Machines (SVM): SVM is a powerful algorithm for both classification and regression tasks. It finds the optimal hyperplane that separates different classes in the feature space, maximizing the margin between classes.

6. K-Nearest Neighbors (KNN): KNN is a simple and intuitive algorithm for classification and regression tasks. It makes predictions based on the similarity of input data points to their k nearest neighbors in the training set.

7. Naive Bayes: Naive Bayes is a probabilistic algorithm based on Bayes' theorem that is commonly used for classification tasks. It assumes that the features are conditionally independent given the class label.

8. Neural Networks: Neural networks are a versatile and powerful class of algorithms inspired by the human brain. They consist of interconnected layers of neurons that learn complex patterns in the data through training.

9. Gradient Boosting Machines (GBM): GBM is an ensemble learning method that builds a series of weak learners sequentially to improve prediction accuracy. It combines multiple decision trees in a boosting framework to minimize prediction errors.

10. Principal Component Analysis (PCA): PCA is a dimensionality reduction technique that transforms high-dimensional data into a lower-dimensional space while preserving as much variance as possible. It helps in visualizing and understanding the underlying structure of the data.

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๐ŸŽ“ ๐—จ๐—ฝ๐—ด๐—ฟ๐—ฎ๐—ฑ๐—ฒ ๐—ฌ๐—ผ๐˜‚๐—ฟ ๐—ฆ๐—ธ๐—ถ๐—น๐—น๐˜€ ๐—ณ๐—ผ๐—ฟ ๐—™๐—ฟ๐—ฒ๐—ฒ ๐—œ๐—ป ๐Ÿฎ๐Ÿฌ๐Ÿฎ๐Ÿฑ

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1. What is the difference between the RANK() and DENSE_RANK() functions?

The RANK() function in the result set defines the rank of each row within your ordered partition. If both rows have the same rank, the next number in the ranking will be the previous rank plus a number of duplicates. If we have three records at rank 4, for example, the next level indicated is 7. The DENSE_RANK() function assigns a distinct rank to each row within a partition based on the provided column value, with no gaps. If we have three records at rank 4, for example, the next level indicated is 5.

2. Explain One-hot encoding and Label Encoding. How do they affect the dimensionality of the given dataset?

One-hot encoding is the representation of categorical variables as binary vectors. Label Encoding is converting labels/words into numeric form. Using one-hot encoding increases the dimensionality of the data set. Label encoding doesnโ€™t affect the dimensionality of the data set. One-hot encoding creates a new variable for each level in the variable whereas, in Label encoding, the levels of a variable get encoded as 1 and 0.

3. What is the shortcut to add a filter to a table in EXCEL?

The filter mechanism is used when you want to display only specific data from the entire dataset. By doing so, there is no change being made to the data. The shortcut to add a filter to a table is Ctrl+Shift+L.

4. What is DAX in Power BI?

DAX stands for Data Analysis Expressions. It's a collection of functions, operators, and constants used in formulas to calculate and return values. In other words, it helps you create new info from data you already have.

5. Define shelves and sets in Tableau?

Shelves: Every worksheet in Tableau will have shelves such as columns, rows, marks, filters, pages, and more. By placing filters on shelves we can build our own visualization structure. We can control the marks by including or excluding data.
Sets: The sets are used to compute a condition on which the dataset will be prepared. Data will be grouped together based on a condition. Fields which is responsible for grouping are known assets. For example โ€“ students having grades of more than 70%.
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๐Ÿญ๐Ÿฌ ๐—ฅ๐—ฒ๐—ฎ๐—น ๐——๐—ฎ๐˜๐—ฎ ๐—”๐—ป๐—ฎ๐—น๐˜†๐˜๐—ถ๐—ฐ๐˜€ ๐—œ๐—ป๐˜๐—ฒ๐—ฟ๐˜ƒ๐—ถ๐—ฒ๐˜„ ๐—ค๐˜‚๐—ฒ๐˜€๐˜๐—ถ๐—ผ๐—ป๐˜€ & ๐—›๐—ผ๐˜„ ๐˜๐—ผ ๐—”๐—ป๐˜€๐˜„๐—ฒ๐—ฟ ๐—ง๐—ต๐—ฒ๐—บ ๐—Ÿ๐—ถ๐—ธ๐—ฒ ๐—ฎ ๐—ฃ๐—ฟ๐—ผ๐Ÿ˜

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Top 10 important data science concepts

1. Data Cleaning: Data cleaning is the process of identifying and correcting or removing errors, inconsistencies, and inaccuracies in a dataset. It is a crucial step in the data science pipeline as it ensures the quality and reliability of the data.

2. Exploratory Data Analysis (EDA): EDA is the process of analyzing and visualizing data to gain insights and understand the underlying patterns and relationships. It involves techniques such as summary statistics, data visualization, and correlation analysis.

3. Feature Engineering: Feature engineering is the process of creating new features or transforming existing features in a dataset to improve the performance of machine learning models. It involves techniques such as encoding categorical variables, scaling numerical variables, and creating interaction terms.

4. Machine Learning Algorithms: Machine learning algorithms are mathematical models that learn patterns and relationships from data to make predictions or decisions. Some important machine learning algorithms include linear regression, logistic regression, decision trees, random forests, support vector machines, and neural networks.

5. Model Evaluation and Validation: Model evaluation and validation involve assessing the performance of machine learning models on unseen data. It includes techniques such as cross-validation, confusion matrix, precision, recall, F1 score, and ROC curve analysis.

6. Feature Selection: Feature selection is the process of selecting the most relevant features from a dataset to improve model performance and reduce overfitting. It involves techniques such as correlation analysis, backward elimination, forward selection, and regularization methods.

7. Dimensionality Reduction: Dimensionality reduction techniques are used to reduce the number of features in a dataset while preserving the most important information. Principal Component Analysis (PCA) and t-SNE (t-Distributed Stochastic Neighbor Embedding) are common dimensionality reduction techniques.

8. Model Optimization: Model optimization involves fine-tuning the parameters and hyperparameters of machine learning models to achieve the best performance. Techniques such as grid search, random search, and Bayesian optimization are used for model optimization.

9. Data Visualization: Data visualization is the graphical representation of data to communicate insights and patterns effectively. It involves using charts, graphs, and plots to present data in a visually appealing and understandable manner.

10. Big Data Analytics: Big data analytics refers to the process of analyzing large and complex datasets that cannot be processed using traditional data processing techniques. It involves technologies such as Hadoop, Spark, and distributed computing to extract insights from massive amounts of data.

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๐—Ÿ๐—ฒ๐—ฎ๐—ฟ๐—ป๐—ถ๐—ป๐—ด ๐—ฆ๐—ค๐—Ÿ ๐—–๐—ฎ๐—ป ๐—•๐—ฒ ๐—™๐˜‚๐—ป! ๐Ÿฐ ๐—œ๐—ป๐˜๐—ฒ๐—ฟ๐—ฎ๐—ฐ๐˜๐—ถ๐˜ƒ๐—ฒ ๐—ฃ๐—น๐—ฎ๐˜๐—ณ๐—ผ๐—ฟ๐—บ๐˜€ ๐—ง๐—ต๐—ฎ๐˜ ๐—™๐—ฒ๐—ฒ๐—น ๐—Ÿ๐—ถ๐—ธ๐—ฒ ๐—ฎ ๐—š๐—ฎ๐—บ๐—ฒ๐Ÿ˜

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Artificial intelligence can change your career by 180 degrees! ๐Ÿ“Œ

Here's how you can start with AI engineering with zero experience!

The simplest definition of artificial intelligence|

Artificial intelligence (AI) is a part of computer science that creates smart systems to solve problems usually needing human intelligence.

AI includes tasks like recognizing objects and patterns, understanding voices, making predictions, and more.

Step 1: Master the prerequisites

Basics of programming
Probability and statistics essentials
Data structures
Data analysis essentials

Step 2: Get into machine learning and deep learning

Basics of data science, an intersection field
Feature engineering and machine learning
Neural networks and deep learning
Scikit-learn for machine learning along with Numpy, Pandas and matplotlib
TensorFlow, Keras and PyTorch for deep learning

Step 3: Exploring Generative Adversarial Networks (GANs)

Learn GAN fundamentals: Understand the theory behind GANs, including how the generator and discriminator work together to produce realistic data.

Hands-on projects: Build and train simple GANs using PyTorch or TensorFlow to generate images, enhance resolution, or perform style transfer.

Step 4: Get into Transformers architecture

Grasp the basics: Study the Transformer architecture's key concepts, including attention mechanisms, positional encodings, and the encoder-decoder structure.
Implementations: Use libraries like Hugging Faceโ€™s Transformers to experiment with different Transformer models, such as GPT and BERT, on NLP tasks.

Step 5: Working with Pre-trained Large Language Models

Utilize existing models: Learn how to leverage pre-trained models from libraries like Hugging Face to perform tasks like text generation, translation, and sentiment analysis.

Fine-tuning techniques: Explore strategies for fine-tuning these models on domain-specific datasets to improve performance and relevance.

Step 6: Introduction to LangChain

Understand LangChain: Familiarize yourself with LangChain, a framework designed to build applications that combine language models with external knowledge and capabilities.

Build applications: Use LangChain to develop applications that interactively use language models to process and generate information based on user queries or tasks.

Step 7: Leveraging Vector Databases

Basics of vector databases: Understand what vector databases are and why they are crucial for managing high-dimensional data typically used in AI models.
Tools and technologies: Learn to use vector databases like Milvus, Pinecone, or Weaviate, which are optimized for fast similarity search and efficient handling of vector embeddings.
Practical application: Integrate vector databases into your projects for enhanced search functionalities

Step 8: Exploration of Retrieval-Augmented Generation (RAG)

Learn the RAG approach: Understand how RAG models combine the power of retrieval (extracting information from a large database) with generative models to enhance the quality and relevance of the outputs.

Practical applications: Study case studies or research papers that showcase the use of RAG in real-world applications.

Step 9: Deployment of AI Projects

Deployment tools: Learn to use tools like Docker for containerization, Kubernetes for orchestration, and cloud services (AWS, Azure, Google Cloud) for deploying models.

Monitoring and maintenance: Understand the importance of monitoring AI systems post-deployment and how to use tools like Prometheus, Grafana, and Elastic Stack for performance tracking and logging.

Step 10: Keep building

Implement Projects and Gain Practical Experience

Work on diverse projects: Apply your knowledge to solve problems across different domains using AI, such as natural language processing, computer vision, and speech recognition.

Contribute to open-source: Participate in AI projects and contribute to open-source communities to gain experience and collaborate with others.

Hope this helps you โ˜บ๏ธ
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๐— ๐—ถ๐—ฐ๐—ฟ๐—ผ๐˜€๐—ผ๐—ณ๐˜ ๐—™๐—ฅ๐—˜๐—˜ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—–๐—ผ๐˜‚๐—ฟ๐˜€๐—ฒ๐˜€ ๐Ÿ˜

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- Machine Learning for Beginners
 
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๐Ÿง  Technologies for Data Analysts!

๐Ÿ“Š Data Manipulation & Analysis

โ–ช๏ธ Excel โ€“ Spreadsheet Data Analysis & Visualization
โ–ช๏ธ SQL โ€“ Structured Query Language for Data Extraction
โ–ช๏ธ Pandas (Python) โ€“ Data Analysis with DataFrames
โ–ช๏ธ NumPy (Python) โ€“ Numerical Computing for Large Datasets
โ–ช๏ธ Google Sheets โ€“ Online Collaboration for Data Analysis

๐Ÿ“ˆ Data Visualization

โ–ช๏ธ Power BI โ€“ Business Intelligence & Dashboarding
โ–ช๏ธ Tableau โ€“ Interactive Data Visualization
โ–ช๏ธ Matplotlib (Python) โ€“ Plotting Graphs & Charts
โ–ช๏ธ Seaborn (Python) โ€“ Statistical Data Visualization
โ–ช๏ธ Google Data Studio โ€“ Free, Web-Based Visualization Tool

๐Ÿ”„ ETL (Extract, Transform, Load)

โ–ช๏ธ SQL Server Integration Services (SSIS) โ€“ Data Integration & ETL
โ–ช๏ธ Apache NiFi โ€“ Automating Data Flows
โ–ช๏ธ Talend โ€“ Data Integration for Cloud & On-premises

๐Ÿงน Data Cleaning & Preparation

โ–ช๏ธ OpenRefine โ€“ Clean & Transform Messy Data
โ–ช๏ธ Pandas Profiling (Python) โ€“ Data Profiling & Preprocessing
โ–ช๏ธ DataWrangler โ€“ Data Transformation Tool

๐Ÿ“ฆ Data Storage & Databases

โ–ช๏ธ SQL โ€“ Relational Databases (MySQL, PostgreSQL, MS SQL)
โ–ช๏ธ NoSQL (MongoDB) โ€“ Flexible, Schema-less Data Storage
โ–ช๏ธ Google BigQuery โ€“ Scalable Cloud Data Warehousing
โ–ช๏ธ Redshift โ€“ Amazonโ€™s Cloud Data Warehouse

โš™๏ธ Data Automation

โ–ช๏ธ Alteryx โ€“ Data Blending & Advanced Analytics
โ–ช๏ธ Knime โ€“ Data Analytics & Reporting Automation
โ–ช๏ธ Zapier โ€“ Connect & Automate Data Workflows

๐Ÿ“Š Advanced Analytics & Statistical Tools

โ–ช๏ธ R โ€“ Statistical Computing & Analysis
โ–ช๏ธ Python (SciPy, Statsmodels) โ€“ Statistical Modeling & Hypothesis Testing
โ–ช๏ธ SPSS โ€“ Statistical Software for Data Analysis
โ–ช๏ธ SAS โ€“ Advanced Analytics & Predictive Modeling

๐ŸŒ Collaboration & Reporting

โ–ช๏ธ Power BI Service โ€“ Online Sharing & Collaboration for Dashboards
โ–ช๏ธ Tableau Online โ€“ Cloud-Based Visualization & Sharing
โ–ช๏ธ Google Analytics โ€“ Web Traffic Data Insights
โ–ช๏ธ Trello / JIRA โ€“ Project & Task Management for Data Projects
Data-Driven Decisions with the Right Tools!

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๐—™๐˜‚๐—น๐—น๐˜€๐˜๐—ฎ๐—ฐ๐—ธ ๐——๐—ฒ๐˜ƒ๐—ฒ๐—น๐—ผ๐—ฝ๐—บ๐—ฒ๐—ป๐˜ ๐—™๐—ฅ๐—˜๐—˜ ๐——๐—ฒ๐—บ๐—ผ ๐—–๐—น๐—ฎ๐˜€๐˜€ ๐—œ๐—ป ๐—ฃ๐˜‚๐—ป๐—ฒ๐Ÿ˜

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3. ๐Ÿ” Password Generator
4. ๐Ÿ“… Simple Calendar App
5. ๐Ÿ•น๏ธ Number Guessing Game

Intermediate Level:
6. ๐Ÿ“ฐ News Aggregator using API
7. ๐Ÿ“ง Email Sender App
8. ๐Ÿ—ณ๏ธ Polling/Voting System
9. ๐Ÿง‘โ€๐ŸŽ“ Student Management System
10. ๐Ÿท๏ธ URL Shortener

Advanced Level:
11. ๐Ÿ—ฃ๏ธ Real-Time Chat App (with backend)
12. ๐Ÿ“ฆ Inventory Management System
13. ๐Ÿฆ Budgeting App with Charts
14. ๐Ÿฅ Appointment Booking System
15. ๐Ÿง  AI-powered Text Summarizer

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๐—ง๐—ผ๐—ฝ ๐—–๐—ผ๐—บ๐—ฝ๐—ฎ๐—ป๐—ถ๐—ฒ๐˜€ ๐—ข๐—ณ๐—ณ๐—ฒ๐—ฟ๐—ถ๐—ป๐—ด ๐—™๐—ฅ๐—˜๐—˜ ๐—–๐—ฒ๐—ฟ๐˜๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐Ÿ˜

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Java Developer Interview โค
It'll gonna be super helpful for YOU

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿญ: ๐—ฃ๐—ฟ๐—ผ๐—ท๐—ฒ๐—ฐ๐˜ ๐—ณ๐—น๐—ผ๐˜„ ๐—ฎ๐—ป๐—ฑ ๐—ฎ๐—ฟ๐—ฐ๐—ต๐—ถ๐˜๐—ฒ๐—ฐ๐˜๐˜‚๐—ฟ๐—ฒ
- Please tell me about your project and its architecture, Challenges faced?
- What was your role in the project? Tech Stack of project? why this stack?
- Problem you solved during the project? How collaboration within the team?
- What lessons did you learn from working on this project?
- If you could go back, what would you do differently in this project?

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฎ: ๐—–๐—ผ๐—ฟ๐—ฒ ๐—๐—ฎ๐˜ƒ๐—ฎ
- String Concepts/Hashcode- Equal Methods
- Immutability
- OOPS concepts
- Serialization
- Collection Framework
- Exception Handling
- Multithreading
- Java Memory Model
- Garbage collection

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฏ: ๐—๐—ฎ๐˜ƒ๐—ฎ-๐Ÿด/๐—๐—ฎ๐˜ƒ๐—ฎ-๐Ÿญ๐Ÿญ/๐—๐—ฎ๐˜ƒ๐—ฎ๐Ÿญ๐Ÿณ
- Java 8 features
- Default/Static methods
- Lambda expression
- Functional interfaces
- Optional API
- Stream API
- Pattern matching
- Text block
- Modules

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฐ: ๐—ฆ๐—ฝ๐—ฟ๐—ถ๐—ป๐—ด ๐—™๐—ฟ๐—ฎ๐—บ๐—ฒ๐˜„๐—ผ๐—ฟ๐—ธ, ๐—ฆ๐—ฝ๐—ฟ๐—ถ๐—ป๐—ด-๐—•๐—ผ๐—ผ๐˜, ๐— ๐—ถ๐—ฐ๐—ฟ๐—ผ๐˜€๐—ฒ๐—ฟ๐˜ƒ๐—ถ๐—ฐ๐—ฒ, ๐—ฎ๐—ป๐—ฑ ๐—ฅ๐—ฒ๐˜€๐˜ ๐—”๐—ฃ๐—œ
- Dependency Injection/IOC, Spring MVC
- Configuration, Annotations, CRUD
- Bean, Scopes, Profiles, Bean lifecycle
- App context/Bean context
- AOP, Exception Handler, Control Advice
- Security (JWT, Oauth)
- Actuators
- WebFlux and Mono Framework
- HTTP methods
- JPA
- Microservice concepts
- Spring Cloud

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฑ: ๐—›๐—ถ๐—ฏ๐—ฒ๐—ฟ๐—ป๐—ฎ๐˜๐—ฒ/๐—ฆ๐—ฝ๐—ฟ๐—ถ๐—ป๐—ด-๐—ฑ๐—ฎ๐˜๐—ฎ ๐—๐—ฝ๐—ฎ/๐——๐—ฎ๐˜๐—ฎ๐—ฏ๐—ฎ๐˜€๐—ฒ (๐—ฆ๐—ค๐—Ÿ ๐—ผ๐—ฟ ๐—ก๐—ผ๐—ฆ๐—ค๐—Ÿ)
- JPA Repositories
- Relationship with Entities
- SQL queries on Employee department
- Queries, Highest Nth salary queries
- Relational and No-Relational DB concepts
- CRUD operations in DB
- Joins, indexing, procs, function

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿฒ: ๐—–๐—ผ๐—ฑ๐—ถ๐—ป๐—ด
- DSA Related Questions
- Sorting and searching using Java API.
- Stream API coding Questions

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ ๐Ÿณ: ๐——๐—ฒ๐˜ƒ๐—ผ๐—ฝ๐˜€ ๐—พ๐˜‚๐—ฒ๐˜€๐˜๐—ถ๐—ผ๐—ป๐˜€ ๐—ผ๐—ป ๐—ฑ๐—ฒ๐—ฝ๐—น๐—ผ๐˜†๐—บ๐—ฒ๐—ป๐˜ ๐—ง๐—ผ๐—ผ๐—น๐˜€
- These types of topics are mostly asked by managers or leads who are heavily working on it, That's why they may grill you on DevOps/deployment-related tools, You should have an understanding of common tools like Jenkins, Kubernetes, Kafka, Cloud, and all.

๐—ง๐—ผ๐—ฝ๐—ถ๐—ฐ๐˜€ ๐Ÿด: ๐—•๐—ฒ๐˜€๐˜ ๐—ฝ๐—ฟ๐—ฎ๐—ฐ๐˜๐—ถ๐—ฐ๐—ฒ
- The interviewer always wanted to ask about some design patterns, it may be Normal design patterns like singleton, factory, or observer patterns to know that you can use these in coding.

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โค2
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โค1
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