Big Data Science

12 Aug 2023 18:01

⚔️⚡️Comparison of Spark Dataframe and Pandas Dataframe: advantages and disadvantages
Dataframes are structured data objects that allow you to analyze and manipulate large amounts of information. The two most popular dataframe tools are Spark Dataframe and Pandas Dataframe.
Pandas is a data analysis library in the Python programming language. Pandas Dataframe provides an easy and intuitive way to analyze and manipulate tabular data.
Benefits of Pandas Dataframe:
1. Ease of use: Pandas offers an intuitive and easy to use interface for data analysis. It allows you to quickly load, filter, transform and aggregate data.
2. Rich integration with the Python ecosystem: Pandas integrates well with other Python libraries such as NumPy, Matplotlib and Scikit-Learn, making it a handy tool for data analysis and model building.
3. Time series support: Pandas provides excellent tools for working with time series, including functions for resampling, time windows, data alignment and aggregation.
Disadvantages of Pandas Dataframe:
1. Limited scalability: Pandas runs on a single thread and may experience performance limitations when working with large amounts of data.
2. Memory: Pandas requires the entire dataset to be loaded into memory, which can be a problem when working with very large tables.
3. Not suitable for distributed computing: Pandas is not designed for distributed computing on server clusters and does not provide automatic scaling.

Apache Spark is a distributed computing platform designed to efficiently process large amounts of data. Spark Dataframe is a data abstraction that provides a similar interface to Pandas Dataframe, but with some critical differences.
Benefits of Spark Dataframe:
1. Scalability: Spark Dataframe provides distributed computing, which allows you to efficiently process large amounts of data on server clusters.
2. In-instant computing: Spark Dataframe supports "in-memory" operations, which can significantly speed up queries and data manipulation.
3. Language Support: Spark Dataframe supports multiple programming languages including Scala, Java, Python, and R.
Disadvantages of Spark Dataframe:
1. Slightly slower performance for small amounts of data: Due to the overhead of distributed computing, Spark Dataframe may show slightly slower performance when processing small amounts of data compared to Pandas.
2. Memory overhead: Due to its distributed nature, Spark Dataframe requires more RAM compared to Pandas Dataframe, which may require more powerful data processing servers.

Big Data Science

06 Aug 2023 17:59

💥ConvertCSV is a universal tool for working with CSV
ConvertCSV is an excellent solution for processing and converting CSV and TSV files into various formats, including: JSON, PDF, SQL, XML, HTML, etc.
It is important to note that all data processing takes place locally on your computer, which guarantees the security of user data. The service also provides support for Excel, as well as command-line tools and desktop applications.

Big Data Science

31 Jul 2023 17:59

💥🌎TOP DS-events all over the world in August
Aug 3-4 - ICCDS 2023 - Amsterdam, Netherlands - https://waset.org/cheminformatics-and-data-science-conference-in-august-2023-in-amsterdam
Aug 4-6 - 4th International Conference on Natural Language Processing and Artificial Intelligence - Urumqi, China - http://www.nlpai.org/
Aug 7-9 - Ai4 2023 - Las Vegas, USA - https://ai4.io/usa/
Aug 8-9 - Technology in Government Summit 2023 - Канберра, Австралия - https://www.terrapinn.com/conference/technology-in-government/index.stm
Aug 8-9 - CDAO Chicago - Chicago, USA - https://da-metro-chicago.coriniumintelligence.com/
Aug 10-11 - ICSADS 2023 - New York, USA - https://waset.org/sports-analytics-and-data-science-conference-in-august-2023-in-new-york
Aug 17-19 - 7th International Conference on Cloud and Big Data Computing - Manchester, UK - http://www.iccbdc.org/
Aug 19-20 - 4th International Conference on Data Science and Cloud Computing - Chennai, India - https://cse2023.org/dscc/index
Aug 20-24 - INTERSPEECH - Dublin, Ireland - https://www.interspeech2023.org/
Aug 22-25 - International Conference On Methods and Models In Automation and Robotics 2023 - Мендзыздрое, Польша - http://mmar.edu.pl/

Big Data Science

22 Jul 2023 17:58

😎📊Visualization no longer requires coding
Flourish Studio is a tool for creating interactive data visualizations without coding
With this tool, you can create dynamic and visual graphs, graphs, maps, and other visual elements.
Flourish Studio provides an extensive selection of pre-made templates and animations, as well as an easy-to-assemble visual editor. It can easily turn on and enjoy entertainment.
Cost: #free (no paid plans).

Big Data Science

17 Jul 2023 17:58

📊⚡️Open source data generators
Benerator - test data generation software solution for testing and training machine learning models
DataFactory is a project that makes it easy to generate test data to populate a database as well as test AI models
MockNeat - provides a simple API that allows developers to programmatically create data in json, xml, csv and sql formats.
Spawner is a data generator for various databases and AI models. It includes many types of fields, including those manually configured by the user

Big Data Science

30 Jun 2023 17:59

💥📖TOP DS-events all over the world in July:
Jul 7-9 - 2023 IEEE the 6th International Conference on Big Data and Artificial Intelligence (BDAI) - Zheijiang, China - http://www.bdai.net/
Jul 11-13 - International Conference on Data Science, Technology and Applications (DATA) - Rome, Italy - https://data.scitevents.org/
Jul 12-16 - ICDM 2022: 23th Industrial Conf. on Data Mining - New York, NY, USA - https://www.data-mining-forum.de/icdm2023.php
Jul 14-16 - 6th International Conference on Sustainable Sciences and Technology - Istanbul, Turkey - https://icsusat.net/home
Jul 15-19 - MLDM 2023: 19th Int. Conf. on Machine Learning and Data Mining. New York, NY, USA - New York, USA - http://www.mldm.de/mldm2023.php
Jul 21-23 - 2023 7th International Conference on Artificial Intelligence and Virtual Reality (AIVR2023) - Kumamoto, Japan - http://aivr.org/
Jul 23-29 - ICML - International Conference on Machine Learning - Honolulu, Hawai'I - https://icml.cc/
Jul 27-29 - 7th International Conference on Deep Learning Technologies - Dalian, China - http://www.icdlt.org/
Jul 31-Aug 1 - Gartner Data & Analytics Summit - Sydney, Australia - https://www.gartner.com/en/conferences/apac/data-analytics-australia

Big Data Science

23 Jun 2023 17:59

📊📈📉🤖Pandas AI - AI library for Big Data analysis
Pandas AI is a Python library with built-in generative artificial intelligence or language model.
How it works: in the code editor, you can ask any question about data in natural language and, without writing code, you will get a ready-made answer based on your data.
You can install Pandas AI with the following command:
pip install pandasai
After installation, you need to import the pandasai library and the LLM (Large Language Model) function:
import pandas as pd
from pandasai import PandasAI
from pandasai.llm.openai import OpenAI
However, Pandas AI does not position itself as a replacement for Pandas. As the developers note, this is more of an improvement for the standard Pandas.
The developers also warn that the entire data frame is transmitted along with the question each time, so the solution is far from ideal for processing large data sets.

Big Data Science

16 Jun 2023 17:59

😎🧠⚡️One of the best startups for generating synthetic data for various industries
Hazy is a UK-based synthetic data generation startup that aims to train raw banking data for fintech industries.
Tonic.ai - offers an automated and anonymous way to synthesize data for use in testing and developing various software. This platform also implements database de-identification, which means filtering personal data (PII) from real data, as well as protecting customer privacy.
Mostly.AI is a Vienna-based synthetic data platform that serves industries such as insurance, banking, and telecommunications. It provides cutting-edge AI and top-notch privacy by extracting patterns and structure from source data to prepare vastly different datasets.
YData is a Portuguese startup that helps data scientists solve the problems of poor data quality or access to large user data with scalable AI solutions. When performing tests such as inference attacks, YData engineers are responsible for any risks of leaking or re-identifying an identity. Therefore, they use the TSTR (Train Synthetic Test Real) method, which evaluates the possibility of using AI-generated data to train predictive models.
Anyverse - creates a synthetic 3D environment. Anyverse renders and sets up various scenarios for sample data using a ray tracing engine. The technology calculates the interaction of light rays with scene objects at the physical level.
Rendered.AI is a startup that generates physics-based synthetic datasets for satellites, autonomous vehicles, robotics and healthcare.
Oneview is an Israeli data science platform that uses satellite imagery and remote sensing technologies for defense intelligence.

Big Data Science

09 Jun 2023 17:59

📖💡🤔 Top 6 Datasets for Computer Vision
CIFAR-10 - contains 60 thousand 32x32 color images with 10 classes (animals and real world objects). Each class consists of 6000 images. This dataset contains 50,000 training images and 10,000 test images. The classes are mutually exclusive and there is no overlap between them.
Kinetics-700 - This is a large array of videos, consisting of 650,000 clips describing 700 classes of human actions. The video includes human-thing interactions such as playing musical instruments and human-human interactions such as hugging. Each activity class contains at least 700 video clips, and each clip is annotated with an activity class that is longer than 10 seconds.
IMDB-Wiki - One of the largest publicly available datasets of human faces with gender, age and name. In total it contains 523051 images, 460723 faces are photos of 20284 celebrities from IMDb and 62328 celebrities from Wikipedia.
Cityscapes is a database containing a diverse set of stereographic video clips recorded on the streets of fifty cities. The clips were filmed for a long time under various lighting and weather conditions. Cityscapes contains semantic segmentation of object instances with pixel precision for 30 classes divided into 8 categories. It provides 5000 frame per pixel annotation and 20000 frame approximate annotation.
Fire and Smoke Dataset - This is a dataset of over seven thousand unique HD resolution images. It consists of photos of starting fires and smoke taken by mobile phones in real situations. The pictures were taken in a wide range of lighting and weather conditions. This data set can be used for fire and smoke recognition and detection, as well as anomaly recognition.
FloodNet Dataset - This array consists of high resolution images taken from unmanned drones. The images contain detailed semantic annotations of damage caused by hurricanes.

Big Data Science

04 Jun 2023 17:59

📉📊📈Top 6 tools to analyze data of any nature
DataRobot is a tool for scaling machine learning capabilities. Contains a massive library of open source and in-house models. Solves complex problems in the field of Data Science. Delivers fully explainable AI through human-friendly visual representations. The downside is the price, but a free trial is available
Alteryx combines analytics, machine learning, data science and process automation into a single end-to-end platform. The platform accepts data from hundreds of other data stores (including Oracle, Amazon, and Salesforce), allowing you to spend more time analyzing and less searching. Alteryx allows you to quickly prototype machine learning models and pipelines using automated model training blocks. It helps you easily visualize data throughout the entire problem solving and modeling journey.
H2O is an open source distributed memory machine learning tool with linear scalability. It supports almost all popular statistical and machine learning algorithms, including generalized linear models, deep learning, and gradient boosted machines. H2O takes data directly from Spark, Azure, Spark, HDFS, and various other sources into its distributed in-memory key value store.
SPSS Statistics - designed to solve business and research problems through detailed analysis, hypothesis testing and predictive analytics. SPSS can read and write data from spreadsheets, databases, ASCII text files, and other statistical packages. It can read and write data to external relational database tables via SQL and ODBC.
RapidMiner - supports all stages of the machine learning method, including data preparation, result visualization, model validation, and optimization. In addition to its own collection of datasets, RapidMiner provides several options for creating a database in the cloud to store huge amounts of data. It is possible to store and load data from various platforms such as NoSQL, Hadoop, RDBMS, etc.
Weka is a set of visualization tools and algorithms for data analysis and predictive modeling. All of them are available free of charge under the GNU General Public License. Users can experiment with their datasets by applying different algorithms to see which model gives the best result. They can then use visualization tools to explore the data.

Big Data Science

26 May 2023 17:59

🔥💥Sufficiently useful web data analytics platforms today
Segment is a web platform and API for web analytics and collecting user data to send it to hundreds of tools or data stores. With Segment, you can export data to any internal system and application, play historical data, view real-time events, such as when someone makes a purchase on a website or application.
Metabase is an open source business intelligence tool. Users ask questions about the data, and Metabase displays the answers in meaningful formats like a bar chart or table. Data questions are saved and grouped into informative dashboards that the entire team uses.
Matomo is a web analytics platform that includes a built-in tag manager that allows you to monitor and control the performance of various marketing campaigns. Features include custom data storage, SAML and LDAP authentication, activity logs, media analytics, and custom reports.
SimilarWeb is a cloud-based website traffic analysis platform. Features include data export, performance metrics, custom dashboards, and conversion analysis. Marketing teams benefit from the ability to view demographic data, analyze customer behavior, and discover new opportunities.
Amplitude is a popular product analytics suite that tracks website visitors through collaborative analysis. The software uses custom behavior reports and notifications to offer a better understanding of how visitors interact, as well as provide actionable insights to speed up product development. Amplitude also allows you to define product strategies, improve customer engagement and optimize conversions.

Big Data Science

19 May 2023 17:59

💥⚡️Data markup services today
1. Hasty.ai - this platform has a lot of "smart" tools like GrabCut, Contour and Dextr that recognize the edges or contours of objects, which can be manually adjusted with a threshold value for the best segmentation Images. It also supports markup prediction after annotating enough data. The second feature of the platform is the ability to train your own object recognizer, semantic segmentation and object segmentation. The only drawback is that processing takes time (up to 10-20 seconds), and it could be spent on the markup itself.
2. Superannotate is a Silicon Valley startup that provides vector annotations (rectangles, polygons, lines, ellipses, pattern keypoints, and cuboids) and pixel-by-pixel brush annotation. The best part of this tool is the super pixel function. It is able to recognize the edges of objects with extremely high accuracy, which greatly speeds up semantic and object segmentation compared to other tools. The only problem is that if the boundaries between the subject and the background are fuzzy, she spends more time manipulating the segments than doing the actual work.
3. Datasaur is a data markup program that focuses on text markup. If you need a data markup tool for natural language processing, then this is a pretty interesting option.
4. Clarifai - provides many useful opportunities for AI training. It can mark up data in pictures, videos and text.
5. V7 Darwin - this tool is actively used for annotating images. It allows you to recognize any area or object. It can even be used in videos to automatically annotate keyframes.

Big Data Science

12 May 2023 17:59

😎🔎Several useful geodata Python libraries
gmaps is a library for working with Google maps. Designed for visualization and interaction with Google geodata.
Leafmap is an open source Python package for creating interactive maps and geospatial analysis. It allows you to analyze and visualize geodata in a few lines of code in the Jupyter environment (Google Colab, Jupyter Notebook and JupyterLab)
ipyleaflet is an interactive widget library that allows you to visualize maps
Folium is a Python library for easy geodata visualization. It provides a Python interface to leaflet.js, one of the best JavaScript libraries for creating interactive maps. This library also allows you to work with GeoJSON and TopoJSON files, create background cartograms with different palettes, customize tooltips and interactive inset maps.
geopandas is a library for working with spatial data in Python. The main object of the GeoPandas module is the geodataframe, which is exactly the same as the Pandas dataframe definition, but also includes a Geometry field that contains the definition of the feature.

Big Data Science

05 May 2023 17:59

😳😱Sber has published a dataset for emotion recognition in Russian
Dusha is a huge open dataset for recognizing emotions in oral speech in Russian.
Dusha is suitable for recognizing emotions in oral speech in Russian. The dataset consists of over 300,000 audio recordings with transcripts and emotional tags. The duration is about 350 hours of audio. The team chose four main emotions that usually appear in a dialogue with a voice assistant: joy, sadness, anger, and a neutral emotion. Since each record was marked up by several annotators, who from time to time still performed various control tasks, the markup turned out to be about 1.5 million records.
Read more about the Dusha dataset in the publication: https://habr.com/ru/companies/sberdevices/articles/715468/

Big Data Science

30 Apr 2023 17:59

DS books for the newest ones
1. Data science. John Kelleher, Brendan Tierney - the book covers the main aspects, from the moment of setting up data collection and analysis, to addressing the ethical revelations that are growing due to privacy policies. The reader will walk you through how to run neural networks and machine learning, and guide you through case studies of business problems and how to solve them. Additionally, they will talk about technical requirements that can be transferred to a greater extent.
2. Practical statistics for Data Science specialists. Peter Bruce, Bruce Bruce - A hands-on textbook presented for data scientists with programming language skills and familiarity with the definition of mathematical statistics. Here, in an accessible way, the main points from the statistics of data science are presented, as well as an explanation of what are the important needs and sides of data analysis.
3. We study the spark. Holden Karau, Matei Zachariah, Patrick Wendell, Andy Konwinski - The authors of the books are the developers of the Spark system. They will talk about the analysis of the execution of tasks with a few lines of code, as well as understand the scheme through examples.
4. Data science. Data science from scratch. Joel Gras - Joel Gras talks about the Python language, elements of linear algebra, mathematical statistics, methods for collecting, normalizing and processing data. Additionally, it provides an information base for machine learning. Describes mathematical models and ways to develop them according to the "k" recipe.
5. Fundamentals of Data Science and Big Data. Davy Silen, Arno Meisman, Mohamed Ali - Readers are introduced to theoretical framework, machine learning sequencing, working with large datasets, NoSQL, detailed text analysis and computational information. Examples are Data Science scripts in Python.

Big Data Science

09 Aug 2023 17:59

📝🔎Data Observability: advantages and disadvantages
Data Observability is the concept and practice of providing transparency, control and understanding of data in information systems and analytical processes. It aims to ensure that data is accessible, accurate, up-to-date, and understandable to everyone who interacts with it, from analysts and engineers to business users.
Benefits of Data Observability:
1. Quickly identify and fix problems: Data Observability helps you quickly find and fix errors and problems in your data. This is especially important in cases where even small failures can lead to serious errors in analytical conclusions.
2. Improve the quality of analytics: Through data control, analysts can be confident in the accuracy and reliability of their work results. This contributes to making more informed decisions.
3. Improve Collaboration: Data Observability creates a common language and understanding of data across teams ranging from engineers to business users. This contributes to better cooperation and a more efficient exchange of information.
4. Risk Mitigation: By ensuring data reliability, Data Observability helps to mitigate the risks associated with bad decisions based on inaccurate or incorrect data.
Disadvantages of Data Observability:
1. Complexity of implementation: Implementing a Data Observability system can be complex and require time and effort. This may require changes in the data architecture and the addition of additional tools.
2. Costs: Implementing and maintaining a data observability system can be a costly process. This includes both the financial costs of tools and the costs of training and staff maintenance.
3. Difficulty of scaling: As the volume of data and system complexity grows, it can be difficult to scale the data observability system.
4. Difficulty in training staff: Staff will need to learn new tools and practices, which may require time and training.

In general, Data Observability plays an important role in ensuring the reliability and quality of data, but its implementation requires careful planning and balancing between benefits and costs.

Big Data Science

02 Aug 2023 17:59

📝🔎Problems and solutions of text data markup
Text data markup is an important task in machine learning and natural language processing. However, she may encounter various problems that can make the process difficult and complicated. Some of these problems and possible solutions are listed below:
1. Subjectivity and ambiguity: Text markup can be subjective and ambiguous, as different people may interpret the content differently. This can lead to inconsistencies between markups.
Solution: To reduce subjectivity, it is necessary to provide markers with clear marking instructions and rules. Discussing and revising the results between scalers can also help identify and resolve ambiguities.
2. High cost and time consuming: Labeling text data can be costly and time consuming, especially when working with large datasets.
Solution: Using automatic labeling and machine learning methods for the initial phase can significantly reduce the amount of human work. It is also worth paying attention to the possibility of using crowdsourcing platforms to attract more markers and speed up the process.
3. Lack of standards and formats: There is no single standard for markup of textual data, and different projects may use different markup formats.
Solution: Define standards and formats for marking up data in your project. Follow common standards such as XML, JSON, or IOB (Inside-Outside-Beginning) to ensure compatibility and easy interoperability with other tools and libraries.
4. Lack of training for markups: Marking up textual data may require expert knowledge or experience in a particular subject area, and it is not always possible to find markups with the necessary competence.
Solution: Provide markups with learning material and access to resources to help them better understand the context and specifics of the task. You can also consider training markups within the team to improve markup quality.
5. Heterogeneity and imbalance in data: In some cases, labeling can be heterogeneous or unbalanced, which can affect the quality of training models.
Solution: Make an effort to balance the data and eliminate heterogeneity. This may include collecting additional data for smaller classes or applying data augmentation techniques.
6. Retraining of labelers: Labelers can adapt to the training dataset, which leads to overfitting and poor quality labeling of new data.
Solution: Regularly monitor markup quality and provide feedback to markers. Use cross-validation methods to check the stability and consistency of markups.

Thus, successful markup of textual data requires attention to detail, careful planning, and constant quality control. A combination of automatic and manual labeling methods can greatly improve the process and provide high quality data for model training.

Big Data Science

28 Jul 2023 17:58

📝💡What is CDC: advantages and disadvantages
CDC (Change Data Capture) is a technology for tracking and capturing data changes occurring in a data source, which allows you to efficiently replicate or synchronize data between different systems without the need to completely transfer the entire database. The main goal of CDC is to identify and retrieve only data changes that have occurred since the last capture. This makes the data replication process faster, more efficient, and more scalable.
CDC Benefits:
1. Efficiency of data replication: CDC allows only changed data to be sent, which significantly reduces the amount of data required for synchronization between the data source and the target system. This reduces network load and speeds up the replication process.
2. Scalability: CDC technology is highly scalable, which can handle large amounts of data and high load.
3. Improved Reliability: CDC improves the reliability of the replication system by minimizing the possibility of errors in transmission and forwarding of data.
Disadvantages of CDC:
1. Additional complexity: CDC implementation requires additional configuration and infrastructure, which can increase the complexity of the system and expose it to additional risks of failure.
2. Dependency on the data source: CDC depends on the ability of the data source to capture and provide changed data. If the source does not support CDC, this may be a barrier to its implementation.
3. Data schema conflicts: When synchronizing between systems with different data schemas, conflicts can occur that require additional processing and resolution.
Thus, CDC is a powerful tool for efficient data management and information replication between different systems. However, its successful implementation requires careful planning, tuning and testing to minimize potential risks and ensure reliable system operation.

Big Data Science

20 Jul 2023 17:58

📝💡A few tips for preparing datasets for video analytics
1. Do not require a strict definition to include data in the set: provide a variety of frames so that you can learn about different situations. The higher the diversity of the data set, the better the model will generalize the essence of the detected object.
2. Plan for testing in possible conditions: prepare a list of sites and contacts where you can offer to shoot.
3. Annotate the data: When preparing data for video analytics, it can be useful to annotate the events in the video. This helps to recognize and classify objects more accurately.
4. Time Synchronization: Make sure all cameras are time synchronized. This will help to restore the sequence of events and link the action, which is natural on different cameras.
5. Dividing videos into segments: If you have a search engine for large video files, divide them into smaller segments. This simplifies data processing and analysis, and improves system performance.
6. Video metadata: Create metadata for videos, including timestamps, location information, and other time period data. This is in organizing and searching for video files and events in the subsequent analysis.

Big Data Science

05 Jul 2023 17:59

😎💥YouTube-ASL repository has been made available to the public
This repository provides information about the YouTube-ASL dataset, which is an extensive open source dataset. It contains videos showing American Sign Language with English subtitles.
This dataset includes 11,093 American Sign Language (ASL) footage and has a total length of 984 hours of footage. In addition, there are 610,193 English subtitles in the set.
The repository contains a link to a text document with the video data ID.
This repository is located at the link: https://github.com/google-research/google-research/tree/master/youtube_asl

Big Data Science

28 Jun 2023 17:59

🔎📝Datasets for Natural Language Processing
Sentiment analysis - a set of different datasets, each of which contains the necessary information for analyzing the sentiment of a text. So, the data taken from IMDb is a binary set for sentiment analysis. It consists of 50,000 reviews from the Movie Database (IMDb), marked as either positive or negative.
WikiQA is a collection of question and suggestion pairs. They were collected and annotated to investigate responses to questions in open domains. WikiQA is created using a more natural process. It includes questions for which there are no correct sentences, allowing researchers to work on the response trigger, a critical component of any QA system.
Amazon Reviews dataset - This dataset consists of several million Amazon customer reviews and their ratings. The dataset is used to enable fastText to learn by analyzing consumer sentiment. The idea is that despite the huge amount of data, this is a real business challenge. The model is trained in minutes. This is what sets Amazon Reviews apart from its peers.
Yelp dataset - The Yelp dataset is a collection of businesses, testimonials, and user data that can be applied to a Pet project and academia. You can also use Yelp to teach students how to work with databases, when learning NLP, and as a sample of production data. The dataset is available as JSON files and is a "classic" in natural language processing.
Text classification - Text classification is the task of assigning an appropriate category to a sentence or document. The categories depend on the selected dataset and may vary depending on the topics. For example, TREC is a question classification dataset that consists of fact-based open-ended questions. They are divided into broad semantic categories. The dataset has six-grade (TREC-6) and fifty-grade (TREC-50) versions. Both versions include 5452 training and 500 test cases.

Big Data Science

21 Jun 2023 17:58

⚔️⚡️🤖MDS vs PCA or what is better to use when reducing data dimensionality
Multidimensional Scaling (MDS) and Principal Component Analysis (PCA) are two popular data analysis techniques that are widely used in statistics, machine learning, and data visualization. Both methods aim to compress the information contained in multidimensional data and present it in a form convenient for analysis. Despite similarities in their goals, MDS and PCA have significant differences in their approach and applicability.
Principal Component Analysis (PCA) is a statistical technique used to reduce the dimensionality of data. It looks for linear combinations of the original variables, called principal components, that explain the largest amount of variance in the data.
Benefits of PCA:
1. Eliminate multicollinearity: PCA can be used to eliminate multicollinearity inherent in a set of original variables. It allows you to combine related variables into principal components, eliminating information redundancy.
2. Computational speed: PCA is usually quite efficient in terms of computational costs.
3. Resilience to noise: PCA exhibits greater resilience to noise in the data. In PCA, the dominant components (principal components) explain most of the variance in the data, while the less significant components can represent noise. This allows PCA to better separate signals and noise, which is especially useful when analyzing data with a low signal-to-noise ratio.
Disadvantages of PCA:
1. Linear relationship: PCA is based on the assumption of a linear relationship between variables. In the case of a non-linear relationship, PCA may not detect an important data structure.
2. Loss of interpretability: after projecting the data onto the space of principal components, their interpretation can be difficult, since the new variables are linear combinations of the original variables.
3. Sensitivity to outliers: PCA can be sensitive to the presence of outliers in the data, as they can strongly influence the distribution of principal components.

Multidimensional scaling (MDS) is a data visualization technique that seeks to preserve the relative distances between features in the original data when projected into low-dimensional space.
Advantages of MDS:
1. Accounting for non-linear relationships: MDS does not require the assumption of a linear relationship between variables and can detect non-linear relationships in the data.
2. Preserve relative distances: MDS strives to preserve the relative distances between objects in the source data when rendered. This allows you to detect a data structure that may be lost in the process of dimensionality reduction.
3. Interpretability: MDS makes it relatively easy to interpret low-dimensional projections of data because they preserve the relative distances of the original data.
Disadvantages of MDS:
1. Computational Complexity: MDS can be computationally complex when dealing with large datasets, especially when accurate relative distances between all pairs of objects need to be maintained.
2. Dependency on the metric: MDS requires the definition of a distance metric between objects. Choosing the wrong metric can lead to skewed results.

Thus, PCA and MDS are quite effective data analysis tools. PCA is widely used to reduce data dimensionality and reveal structure in linearly dependent variables, while MDS provides the ability to preserve relative distances and detect non-linear relationships between objects. The choice between these methods depends on the specifics of the data and the goals of the analysis. Where dimensionality reduction and principal component detection is required, PCA may be the preferred choice, while MDS is recommended for visualizing and maintaining relative distances in data.

Big Data Science

14 Jun 2023 17:59

🤔🤖Is Trino so good: advantages and disadvantages
Trino is a distributed SQL query engine for large-scale data analysis. It is designed to run analytical queries on large amounts of data that can be distributed across multiple nodes or clusters.
Trino Benefits:
1. Scalable: Trino can handle huge amounts of data efficiently across multiple nodes. It can scale horizontally by adding new nodes to the cluster and load balancing to process requests.
2. High performance with Big Data: Trino is optimized for analytic queries on big data. It uses parallel query processing to speed up complex queries and improve overall performance.
3. Flexibility and compatibility: Trino supports the SQL standard and can work with various data sources such as Hadoop HDFS, Amazon S3, Apache Kafka, MySQL, PostgreSQL and many more. It also integrates with various data analysis tools and platforms.
Trino Disadvantages:
1. Difficult to set up: Setting up and managing the Trino can be a difficult task, especially for non-professionals. It requires skilled professionals to properly tune and optimize performance.
2. Limited support for administrative functions: Trino is focused on executing analytical queries and processing data, so it may have limited support for administrative functions such as monitoring, data backup and recovery. You may need additional tools or settings for these tasks.
3. No built-in resource management system: Trino does not have a built-in resource management system or scheduler. This means that you must use third party tools or tweaks to efficiently allocate resources between queries and control cluster performance.
4. Dependency on Third Party Tools and Platforms: Trino integrates with various data analysis tools and platforms, but its functionality may depend on these third party components. This can make it difficult to manage and update the entire ecosystem, especially when using new versions or additional integrations.
5. Not suitable for transactional operations: Trino is not designed to perform transactional operations such as inserting, updating, and deleting data. If you require transaction processing, you should consider other systems that specialize in this area.

All in all, Trino is a powerful tool for large-scale data analysis, especially in the realm of executing analytical queries on large volumes of data. It provides high performance and flexibility, allows you to work with various data sources and integrate with other data analysis tools and platforms. However, when using Trino, it is necessary to take into account its disadvantages and take into account the specific requirements of the project and infrastructure.

Big Data Science

08 Jun 2023 17:59

⚔️🤖🧠Spark DataFrame vs Pandas Dataframe: Advantages and Disadvantages
Spark DataFrame and Pandas DataFrame are data structures designed to make it easy to work with tabular data in Python, but they have some differences in their functionality and the way they process data.
Spark DataFrame is the core component of Apache Spark, a distributed computing platform for processing large amounts of data. It is a distributed collection of data organized in named columns.
Pandas DataFrame is a data structure provided by the Pandas library that provides powerful tools for parsing and manipulating tabular data. Pandas DataFrame is a two-dimensional labeled array of rows and columns, similar to a database table or spreadsheet.
Benefits of Spark Dataframe:
1. Distributed data processing: Spark Dataframe is designed to process large amounts of data and can work with data that does not fit in the memory of a single node. It distributes data and calculations across the cluster, which allows you to achieve high performance.
2. Programming language support: Spark Dataframe supports multiple programming languages, including Python, Scala, Java, and R. This allows developers to use their preferred language when working with data.
3. Support for different data sources: Spark Dataframe can work with different data sources such as Hadoop Distributed File System (HDFS), Apache Hive, Apache HBase, Apache Cassandra and many more. It provides convenient APIs for working with different data formats.
Disadvantages of Spark Dataframe:
1. Difficulty in setting up and managing a cluster: Spark requires setting up and managing a cluster for distributed data processing. This can be difficult for first time users or projects with limited resources.
2. Slow startup: Starting a Spark cluster can take time, especially if networking and other settings need to be configured. For small datasets, this can be inefficient and take longer than processing the data by Spark itself.

Benefits of Pandas Dataframe:
1. Ease of use: Pandas Dataframe provides a simple and intuitive API for working with data. It offers many features for filtering, sorting, grouping, and aggregating data, making it convenient for data analysis.
2. Large user community: Pandas is a very popular tool in the data analytics and machine learning community. This means that there are many resources, documentation and communities where you can get help and support.
3. High performance on small datasets: Pandas is optimized to work with relatively small datasets that can fit in the memory of a single node. In such cases, Pandas can be faster than Spark.
Disadvantages of Pandas Dataframe:
1. Memory Limits: Pandas Dataframe stores all data in memory, so working with large datasets can be limited by the available memory on your computer. This can cause performance issues or even crash the program.
2. Limited scalability: Pandas is designed to run on a single node and cannot scale efficiently for distributed processing. If you have a large amount of data that doesn't fit in a single node's memory, Pandas can become inefficient.
Thus, the choice between Spark Dataframe and Pandas Dataframe depends on specific needs. If there are large amounts of data and distributed processing is required, then Spark Dataframe may be preferable. If you are working with small datasets and looking for a simple and fast way to analyze your data, then Pandas Dataframe might be the best choice.

Big Data Science

31 May 2023 17:59

💥TOP-7 DS-events all over the world in June:
Jun 2-4 - Machine Learning Prague - Prague, Czech - https://mlprague.com/
Jun 7-8 - Data Science Salon NYC | AI and ML in Finance & Technology - New York, NY, USA - https://www.datascience.salon/nyc/
Jun 8 - DATA CENTER 2023 - Любляна, Словения - https://datacenter.palsit.com/en/
Jun 14-15 - AI Summit London 2023 - London, Great Britain - https://london.theaisummit.com/
Jun 18-22 - Machine Learning Week - Las Vegas, USA - https://www.predictiveanalyticsworld.com/machinelearningweek/
Jun 19-22 - The Event for Machine Learning Technologies & Innovations - Munich, Germany - https://mlconference.ai/munich/
Jun 30 - Jul 2 - 4th Int. Conf. on Artificial Intelligence in Education Technology - Berlin, Germany - https://www.aiet.org/index.html

Big Data Science

24 May 2023 17:59

🧐📝🤖Clickhouse data processing: advantages and disadvantages
ClickHouse is an open column database for analytics and processing of large amounts of data. It was developed by Yandex and is designed for processing and analyzing Big Data in real time.
Clickhouse Benefits:
1. High performance: ClickHouse is designed to handle very large amounts of data at high speed. It can efficiently handle queries that require complex aggregations and analytics on billions of rows of data.
2. Scalability: ClickHouse provides horizontal scaling, which means that it can be easily scaled by adding new cluster nodes to increase performance and handle large amounts of data.
3. Low latency: ClickHouse provides low latency query execution due to its columnar architecture that allows you to quickly filter and aggregate the data needed to answer queries.
4. Efficient use of resources: ClickHouse is optimized to work on high-load systems and offers various mechanisms for data compression and memory management, which allows efficient use of server resources.
5. SQL query support: ClickHouse supports the standard SQL query language, which makes it easy to develop and integrate existing tools and applications.

However, despite all the advantages, Clickhouse has a number of disadvantages:
1. Focused on analytics: ClickHouse is the best choice for analytical tasks, but may be less suitable for operational or transactional workloads where frequent data changes or the recording of a large number of small transactions are required.
2. Complexity of configuration and management: Setting up and managing ClickHouse can be a complex process, especially for beginners. Some aspects, such as data distribution, require careful planning and experience to achieve optimal performance.
3. Lack of full support for transactions: ClickHouse does not provide full support for transactions, which may be a disadvantage for some applications that require data consistency and atomic operations.
4. Difficulty in making data schema changes: Making data schema changes in ClickHouse can be complex and require reloading data or rebuilding tables, which can be time and resource consuming.
Thus, ClickHouse is a powerful and efficient system for analytics on large volumes of data, but requires careful planning and configuration for optimal performance.

Big Data Science

17 May 2023 17:59

😱YouTube video has been turned into a data warehouse
The AKA ISG algorithm was created by enthusiasts to turn YouTube videos into free and virtually unlimited data storage. The essence of the algorithm is that it allows you to embed files in videos and upload them to YouTube as part of the video. Each file is made up of bytes, which can be represented as numbers. In turn, each pixel in the video can be interpreted as either white (1) or black (0).
The result is a video, each frame of which contains information.
According to the developers, YouTube has no limit on the number of videos that can be uploaded. This means that, in this way, it is effectively infinite cloud storage.

Big Data Science

10 May 2023 17:59

⚔️🤖Pandas vs Datatable: features of comparison when working with big data
Pandas and Datatable are two popular libraries for working with data in the Python programming language. However, they have some features that are used to choose one or another library for a specific task.
Pandas is one of the most common and popular data manipulation libraries in Python. It provides a wide and flexible toolkit for working with large data types, including tables, time series, multidimensional arrays, and more. Pandas also provides many data manipulation features such as filtering, sorting, grouping, aggregation, and more.
Pandas Benefits:
1. Powerful tools for working with large data types, including tables, time series, multidimensional arrays, and more.
2. Widespread community support that often causes bugs and library updates.
3. A rich set of functions for working with data, such as filtering, sorting, grouping, aggregation and more.
4. Fairly extensive documentation
Disadvantages of pandas:
1. Poor performance when working with large amounts of data.
2. Inconvenience when dealing with high column averages.

Datatable is a library designed to improve the performance and efficiency of working with data in Python. It provides faster data handling than Pandas, especially when working with large amounts of data. Datable provides a syntax very similar to Pandas that makes it easier to switch from one library to another.
Advantages
1. Sufficiently high performance when working with large amounts of data.
2. Syntax very similar to Pandas, which makes it easier to switch from one library to another.
Disadvantages of Datatable:
1. More limited functionality than Pandas
2. Limited cross-platform: some functions in Datatable may work differently on different textures, which can cause problems during development and testing.
3. Small community: Datatable is not as widely used as Pandas, which means that there is relatively little community and users who can help with issues and issues involved with the library.

Thus, the choice between Pandas and Datatable depends on the specific task and performance guarantee. If you need to work with large amounts of data and need maximum performance, then Datatable may be the best choice. If you need to work with data type discovery and operations, then Pandas is the best choice.

Big Data Science

03 May 2023 17:59

🤓🧐Data consistency and its types
The concept of data consistency is complex and ambiguous, and its definition may vary depending on the context. In his article, which was translated by the VK Cloud team, the author discusses the concept of "consistency" in the context of distributed databases and offers his own definition of this term. In this article, the author identifies 3 types of data consistency:
1. Consistency in Brewer's theorem - According to this theorem, in a distributed system it is possible to guarantee only two of the following three properties:
Consistency: the system provides an up-to-date version of the data when it is read
Availability: every request to a node that is functioning properly results in a correct response
Partition Tolerance: The system continues to function even if there are network traffic failures between some nodes
2. Consistency in ACID transactions - In this category, consistency means that a transaction cannot lead to an invalid state, since the following components must be observed:
Atomicity: any operation will be performed completely or will not be performed at all
Consistency: after the completion of the transaction, the database is in a correct state
Isolation: when one transaction is executed, all other parallel transactions should not have any effect on it
Reliability: even in the event of a failure (no matter what), the completed transaction is saved
3. Data Consistency Models - This definition of the term also applies to databases and is related to the concept of consistency models. There are two main elements in the database consistency model:
Linearizability - replication of a single piece of data across multiple nodes affects its processing in the database
Serializability - simultaneous execution of transactions that work with several pieces of data affects their processing in the database
More details can be found in the source: https://habr.com/ru/companies/vk/articles/723734/

Big Data Science

28 Apr 2023 17:59

😎TOP-10 DS-events all over the world in May:
May 1-5 - ICLR - International Conference on Learning Representations - Kigali, Rwanda - https://iclr.cc/
May 8-9 - Gartner Data & Analytics Summit - Mumbai, India - https://www.gartner.com/en/conferences/apac/data-analytics-india
May 9-11 - Open Data Science Conference EAST - Boston, USA - https://odsc.com/boston/
May 10-11 - Big Data & AI World - Frankfurt, Germany - https://www.bigdataworldfrankfurt.de/
May 11-12 - Data Innovation Summit 2023 - Stockholm, Sweden - https://datainnovationsummit.com/
May 17-19 - World Data Summit - Amsterdam, The Netherlands - https://worlddatasummit.com/
May 19-22 - The 15th International Conference on Digital Image Processing - Nanjing, China - http://www.icdip.org/
May 23-25 - Software Quality Days 2023 - Munich, Germany - https://www.software-quality-days.com/en/
May 25-26 - The Data Science Conference - Chicago, USA - https://www.thedatascienceconference.com//
May 26-29 - 2023 The 6th International Conference on Artificial Intelligence and Big Data - Chengdu, China - http://icaibd.org/index.html