Tuesday, April 11, 2023

Decaying Window

This algorithm allows you to identify the most popular elements (trending, in other words) in an incoming data stream.


The decaying window algorithm not only tracks the most recurring elements in an incoming data stream, but also discounts any random spikes or spam requests that might have boosted an element’s frequency. In a decaying window, you assign a score or weight to every element of the incoming data stream. Further, you need to calculate the aggregate sum for each distinct element by adding all the weights assigned to that element. The element with the highest total score is listed as trending or the most popular.


  1. Assign each element with a weight/score.
  2. Calculate aggregate sum for each distinct element by adding all the weights assigned to that element.


In a decaying window algorithm, you assign more weight to newer elements. For a new element, you first reduce the weight of all the existing elements by a constant factor k and then assign the new element with a specific weight. The aggregate sum of the decaying exponential weights can be calculated using the following formula:

t1i=0ati(1c)i

Here, c is usually a small constant of the order  or . Whenever a new element, say at+1 , arrives in the data stream you perform the following steps to achieve an updated sum:

1. Multiply the current sum/score by the value (1−c).
2. Add the weight corresponding to the new element.

Generally i is considered as 1 

Weight decays exponentially over time

In a data stream consisting of various elements, you maintain a separate sum for each distinct element. For every incoming element, you multiply the sum of all the existing elements by a value of (1−c). Further, you add the weight of the incoming element to its corresponding aggregate sum.

A threshold can be kept to, ignore elements of weight lesser than that.

Finally, the element with the highest aggregate score is listed as the most popular element.

Example

For example, consider a sequence of twitter tags below:
fifa, ipl, fifa, ipl, ipl, ipl, fifa

Also, let's say each element in sequence has weight of 1.
Let's c be 0.1
The aggregate sum of each tag in the end of above stream will be calculated as below:

fifa

fifa - 1 * (1-0.1) = 0.9
ipl - 0.9 * (1-0.1) + 0 = 0.81 (adding 0 because current tag is different than fifa)
fifa -  0.81 * (1-0.1) + 1 = 1.729 (adding 1 because current tag is fifa only)
ipl - 1.729 * (1-0.1) + 0 = 1.5561
ipl - 1.5561 * (1-0.1) + 0 = 1.4005
ipl - 1.4005 * (1-0.1) + 0 = 1.2605
fifa -  1.2605 * (1-0.1) + 1 = 2.135

ipl

fifa - 0 * (1-0.1) = 0
ipl - 0 * (1-0.1) + 1 = 1 
fifa -  1 * (1-0.1) + 0 = 0.9 (adding 0 because current tag is different than ipl)
ipl - 0.9 * (1-0.01) + 1 = 1.81
ipl - 1.81 * (1-0.01) + 1 = 2.7919
ipl - 2.7919 * (1-0.01) + 1 = 3.764
fifa - 3.764 * (1-0.01) + 0  = 3.7264

In the end of the sequence, we can see the score of fifa is 2.135 but ipl is 3.7264
So, ipl is more trending then fifa
Even though both of them occurred same number of times in input there score is still different.

Advantages of Decaying Window Algorithm:

  1. Sudden spikes or spam data is taken care.
  2. New element is given more weight by this mechanism, to achieve right trending output.

Similar Blog : Nitin Decaying Window

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Sampling + Reservoir Sampling Algorithm + Hot List Problem + Frequent Algorithm +Space Saving Algorithm


Sampling : subset of data to be analyzed such that it has approximately the same properties of the original data

Random Sampling:Each element has equal probability of being selected
Reservior Sampling : A technique to maintain online random sample

Reservior Sampling Algorithm

1.Used to maintain an online random sample
2.Maintains a sample of size k, known as reservoir
3.Every new element has a probability k/n of replacing an old element in the reservoir
4.Let us say, k=1: An item in a stream of length n replaces the element in the reservoir with probability 1/n




Hot List Problem

Goal to Achieve

1.continuously maintain a list of the top-k most frequent elements in a stream
2.rank the items and absolute count is immaterial

Hot List Problem +  Frequent Algorithm 



Hot List Problem - Space Saving Algorithm




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Saturday, April 8, 2023

Cassandra

Cassandra is a NoSQL database for write-heavy workload and eventual consistency












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Wednesday, April 5, 2023

Link Analysis

Link analysis for most IR functionality thus far based purely on text

Scoring and ranking
Link-based clustering – topical structure from links
Links as features in classification – documents that link to one another are likely to be on the same subject

Assumptions
1.Reputed Sites
2.Annotation of Target


Page Rank 
 Scoring measure based on the link structure of web pages
 PageRank = long-term visit rate = steady state probability.
 
Markov chains
 Markov chain is a discrete-time stochastic process: a process that occurs in a series of time-steps in each of which a random choice is made.
 A Markov chain consists of N states, plus an N × N transition probability matrix P.
 state = page
 At each step, we are on exactly one of the pages.



Teleporting – to get us out of dead ends






HITS – Hyperlink-Induced Topic Search

Hubs:  A hub page is a good list of links to pages answering the information need
Authorities:  An authority page is a direct answer to the information need

A good hub page for a topic links to many authority pages for that topic
A good authority page for a topic is linked to by many hub pages for that topic




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Tuesday, April 4, 2023

Recommender Systems

Long tail effect :  Many popular products are found in both Retail / Online 
                    less popular products are found only online  

---------------------------------
Modelling Recommender Systems 

U = {USERS}
I = {ITEMS}
F is a utility function, measures the usefulness of items I to user U.
F:UxI -> R where R is the rating 

--------------------------------

Characteristics of recommendation system



Types of recommender system 





SVD - Singular value decomposition







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Sunday, April 2, 2023

Web Crawler

Web Crawler : It is a software for  downloading pages from the Web. Also known as Web Spider, Web Robot,  or simply Bot.

Web Crawler Applications

1.Create an index covering broad topics (General  Web search )
2.Create an index covering specific topics (Vertical  Web search )
3.Archive content :(Web archival, URL: http://www.archive.org/ )
4.Analyze Web sites for extracting aggregate  statistics (Web characterization )
5.Keep copies or replicate Web sites  (Web mirroring-daily or weekly)
6.Web site analysis (broken links, site not available)

Crawler Taxonomy




Basic Web Crawler Architecture
 3 components in Web Crawler

Scheduler - Maintains a queue of URLS to Visit 
downloader - downloads the pages
Storage - makes indexing of pages and provides scheduler with metadata on the pages retrieved


Crawling complications 

1.Malicious Pages - spam pages & spider traps (crawler traps)
2.Non-malicious pages - 
      Latency / Bandwidth  to remote servers vary 
      Webmasters stipulations -- how deep one has to crawl in a website.
3.Site mirrors and duplicate pages 
4.Politness --> how frequently we should hit the server
         Explicit politeness: specifications from  webmasters on what portions of site  can be crawled
                                            robots.txt
        Implicit politeness: even with no  specification, avoid hitting any site too  often
 
--------------------------------------------------------------------------------------------------------------------- 
  
Crawler should be distributed / scalable / performance & efficiency 
                   fetch higher quality pages first
   continuous operation -- fetch fresh copies of previous pages 
   Extensible : Adapt to new data formats.
 
robots.txt --> avoids overloading of the site.

----------------------------------------------------------------------------------------------------------------------
URL frontier





1.The URL frontier is the data structure that holds and  manages URLs we’ve seen, but that have not been  crawled yet.
2.Can include multiple pages from the same host
3.Must avoid trying to fetch them all at the same time
4.Must keep all crawling threads busy

Considerations 

Politeness: do not hit a web server too  frequently
Freshness: crawl some pages more often  than others


-------------------------------------------------------------------------------------------------------------
Basic crawl architecture 


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Friday, March 31, 2023

Websearch

 Search engine

 1. Crawler Based 
 2. Directory 
 3. Metasearch 
 
Search Types

 1. General Search / Horizontal Search : ex : google --> results are very broad and results might not be relevant sometimes.
 2. Vertical search - very specific search or specific part of internet ; ex: google images / Amazon product search.
 



 
 Web challenges for IR 
 ---------------------
 1.Distributed Data: Documents spread over millions of  different web servers.
 2.Volatile Data: Many documents change or disappear  rapidly (e.g. dead links).
 3.Large Volume: Billions of separate documents.
 4.Unstructured and Redundant Data: No uniform  structure, HTML errors, up to 30% (near) duplicate  documents.
 5.Quality of Data: No editorial control, false information,  poor quality writing, typos, etc.
 6.Heterogeneous Data: Multiple media types (images,  video, VRML), languages, character sets, etc.
 
 
Modeling the Web
----------------

Heaps’ and Zipf’s laws are also valid in the Web.
»In particular, the vocabulary grows faster (larger) and the word
distribution should be more biased (larger)

Heaps’ Law
» An empirical rule which describes the vocabulary growth as a  function of the text size.
» It establishes that a text of n words has a vocabulary of size O(n𝛽) for
0< 𝛽 <1

Zipf’s Law
» An empirical rule that describes the frequency of the text words.
» It states that the i-th most frequent word appears as many times as
the most frequent one divided by i 𝛽, for some 𝛽 >1


Different types of queries 

1. Informational queries : learn about something - 40%
2. Navigational queries : take to a page - 25%
3. Transactional queries : want to do something - 35%

Essential Characteristics for  user-friendliness of  a website 
1.Mobile Compatibility
2.Accessible to All Users
3.Well Planned Information Architecture
4.Well-Formatted Content That Is Easy to Scan
5.Fast Load Times
6.Browser Consistency
7.Effective Navigation
8.Good Error Handling
9.Contrasting Color Scheme
10.Usable forms


Centralized Architecture - Crawler-Indexer Architecture
important components
1.Crawler / spider 
2.Indexer 
3.Query Engine  




Indexing process
1. text acquisition 
2. text transformation
3. Index creation

Query Process
1.User Interaction
2.Ranking
3.Evaluations



Distributed Architecture - 
Harvest 
  Gathers and Brokers


 
  
User Interface 
 query interface
 Answer interface 


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Ranked Retrieval Evaluation - Rank Based Measures - Non- Binary relevance

Non- Binary relevance

Documents are rarely entirely relevant or non-relevant  to a query
Many sources of graded relevance judgments
Relevance judgments on a 5-point scale
Multiple judges
Click distribution and deviation from expected levels
(but click-through != relevance judgments)





Normalized Discounted  Cumulative Gain (NDCG)















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Ranked Retrieval Evaluation - Rank Based Measures - Binary relevance

Binary relevance -->  we are only worried if it is relevant or not 


Precision@K (P@K) -- only top documents ie compute  % relevant documents are picked in K


Practical Example : Practical Example

-----------------------------------------------------------------
Mean Average Precision (MAP): 






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Mean Reciprocal Rank (MRR)







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Wednesday, March 29, 2023

Unranked Retrieval Evaluation- Precision and Recall based on documents and F-Measure

Unranked Retrival Information
important measures are 

Precision:The ability to retrieve top-ranked documents that are mostly relevant. 

Recall:The ability of the search to find all of the  relevant items in the corpus.




F-measure : 
1.Takes into  account both recall and precision.
2. Harmonic mean of recall and precision










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TREC Benchmark / Measuring Relevance / Evaluating IR system

Measures for Search Engine
1. Latency of search
2. Expressiveness of query Language 
Ability to express complex information needs
Speed on complex queries

Measuring Releavance based on User 
Three elements:
1. A benchmark document collection
2. A benchmark suite of queries
3. An assessment of either Relevant or  Nonrelevant for each query and each  document

TREC Benchmark - Text REtrieval Conference 





Evaluating IR system -- need to verify if retrived document is relaveant or not

Difficulties in Evaluating IR Systems
1.Effectiveness is related to the relevancy of  retrieved items.
2.Relevancy is not typically binary but continuous.
3.Even if relevancy is binary, it can be a  difficult judgment to make.
Relevancy, from a human standpoint, is:
Subjective: Depends upon a specific user’s  judgment.
Situational: Relates to user’s current needs.
Cognitive: Depends on human perception and  behavior.
Dynamic: Changes over time.
Evaluating IR systems 
1. Gold Standard (Human Labeled Corpora) : Using Humans to create Gold standard - Manual


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Tuesday, March 28, 2023

Anu's NLP Session on BITS WILP Pre Mid Semester Topic - 2 - DSECLZG525



Below vedio has the complete numerical explanation for NLP topics 
1.Grammars and Parsing
2.A Top Down Parser
3. A Bottom- Up Chart Parser
4.Parsing Techniques 
5.Context Free Grammars
5. Probabilistic CKY Parsing of PCFGs
6.Problems with PCFGs.




Session 1 video : Session 1 

Anu Garg linkedin : https://www.linkedin.com/in/anu-garg-9ab13962 





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Anu's NLP Session on BITS WILP Pre Mid Semester Topic - 1 - DSECLZG525


Below Video has complete numerical explanation for NLP topics like 
1.Natural Language Understanding and Generation
2.N-gram Language Modelling
3.Part-of-Speech Tagging
4.Hidden Markov Model Algorithms
5.The Forward Algorithm
6.The Viterbi Algorithm 
7.The Forward-Backward Algorithm
8.Maximum Entropy Markov Model
9. Laplace smoothing.



Part 2 Session Link : Session 2












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Thursday, March 9, 2023

INSTALLING HADOOP, HIVE IN WINDOWS & WORKING WITH HDFS -- Ramana (Along with recording)

########-----------INSTALLING HADOOP, HIVE IN WINDOWS & WORKING WITH HDFS -------------- ########
################ ------------ AKULA VENKATA RAMANA ------------ #################

Link to download Java JDK 8: https://www.oracle.com/java/technologies/downloads/#java8 (go for java version 1.8.0_261)
Link to download Hadoop(hadoop - 2.8.0): https://muhammadbilalyar.github.io/blogs/How-to-install-Hadoop-on-Window-10/


HIVE Installtion on WINDOWS:
https://www.youtube.com/watch?v=npyRXkMhrgk

Download Hive -
https://archive.apache.org/dist/hive/hive-2.1.0/

Download Derby Metastore-
https://archive.apache.org/dist/db/derby/db-derby-10.12.1.1/

Download hive-site.xml-
https://drive.google.com/file/d/1qqAo7RQfr5Q6O-GTom6Rji3TdufP81zd/view


# How to extract .tar.gz files on Windows 11
Run cmd as Admin:
tar -xvzf source file path -C destination path


# Format the HDFS filesystem: Run the following command in the admin command prompt to format the HDFS filesystem: 
hdfs namenode -format

# Start Hadoop services: Run the following command in the command prompt to start the Hadoop services: start-dfs & start-yarn
start-dfs
start-yarn

# Verify installation: run the following command in the command prompt to verify that the Hadoop cluster is running: jps
C:\hadoop-2.8.0\sbin>jps
16592 ResourceManager
19296 DataNode
15096 Jps
18776 NameNode
27644 NodeManager

if we get all nodes & jps printed on console that means you have now successfully configured Hadoop in pseudo-distributed mode on Windows.
pseudo nodes means:  In Hadoop, the pseudo-distributed mode is a single-node Hadoop cluster, where all the Hadoop daemons run on a single machine. 
This mode is useful for testing and development purposes when we want to simulate a distributed Hadoop environment on a single machine.

In pseudo-distributed mode, all the Hadoop daemons such as NameNode, DataNode, ResourceManager, and NodeManager run in separate Java Virtual Machines (JVMs) 
on the same machine. This means that we can use Hadoop commands and APIs to perform the same tasks as we would in a fully distributed mode cluster.

********************************************** Installation completed *****************************************************************************

What next? Once the Hadoop cluster running.....

# Start Derby > bin
derby-10.12.1.1

# Start the port:
startNetworkServer -h 0.0.0.0    

to get the below connections on port 1527
Fri Mar 03 14:51:19 IST 2023 : Security manager installed using the Basic server security policy.
Fri Mar 03 14:51:19 IST 2023 : Apache Derby Network Server - 10.12.1.1 - (1704137) started and ready to accept connections on port 1527

# Start Hive: hive-2.1.0

# If you get this error: C:\hive-2.1.0\bin>hive
"Missing hadoop installation: C:\hadoop-2.8.0\bin must be set" then go to hadoop directory and set the below path:

set HADOOP_HOME=C:\hadoop-2.8.0

Now start Hive:


C:\hive-2.1.0\bin>hive
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/hive-2.1.0/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/hadoop-2.8.0/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
Connecting to jdbc:hive2://
Connected to: Apache Hive (version 2.1.0)
Driver: Hive JDBC (version 2.1.0)
Transaction isolation: TRANSACTION_REPEATABLE_READ
Beeline version 2.1.0 by Apache Hive
hive> 


# Show Databases / Dropping Tables / Dropping Databases etc
show databases;
use bdsassignment;
DROP TABLE ret_table_data;
DROP DATABASE bdsassignment;


# Creating a data base in Hive
create database bdsassignment;

# Use that database
use bdsassignment;

# Creating table in Hive
CREATE TABLE ret_table_data (
  record_no INT,
    invoice STRING,
    stockcode STRING,
    description STRING,
    quantity INT,
    invoicedate TIMESTAMP,
    price DOUBLE,
    customer_id INT,
    country STRING
)
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde' 
WITH SERDEPROPERTIES ( 
  "separatorChar" = ",", 
  "quoteChar"     = "\"", 
  "escapeChar"    = "\\" 
STORED AS TEXTFILE
TBLPROPERTIES ("skip.header.line.count"="1");



# Now load the data intot the Hive table
load data local inpath 'C:\Assignment -2  2023 BDS DATA SET online_retail_data.csv' into table ret_table_data;


# To check if the data is propely loaded
select * from ret_table_data limit 20;


# For checking the Table description
describe formatted ret_table_data;


# Location where it is stored in hdfs: (check this in hadoop-2.8.0 command)
hdfs://localhost:9001/user/hive/warehouse/bdsassignment.db/ret_table_data

# To check the lehgth of the data set
select count(*) from ret_table_data;

# 2) Country from which the maximum revenue was collected from sales in the month of March 2010

SELECT country, SUM(quantity*price) AS revenue
FROM (
  SELECT country, quantity, price,
         substr(invoicedate, 1, 10) AS inv_date
  FROM ret_table_data
  WHERE ((invoicedate LIKE '%03-2010%') OR (invoicedate LIKE '%03/2010%'))
) t
GROUP BY country
ORDER BY revenue DESC
LIMIT 1;

# To monitor the Job status
http://localhost:8088

http://localhost:50070


# add the following line to your mapred-site.xml file, replacing the path with the correct path to your Python executable:
<property>
  <name>mapreduce.executable</name>
  <value>C:\Users\venka\anaconda3\pkgs\python-3.9.12-h6244533_0\python.exe</value>
</property>

# To leave the safemode
hdfs dfsadmin -safemode leave

# Run the MapReduce job using the following command: ensure to have py files of mapper & reducer on specified path:

# Now run the below command in Hadoop:

 hadoop jar C:\hadoop-2.8.0\share\hadoop\tools\lib\hadoop-streaming-2.8.0.jar ^
-files "file:///C:/wordcoutmapper.py,file:///C:/wordcoutreducer.py" ^
-mapper " C:\Users\venka\anaconda3\pkgs\python-3.9.12-h6244533_0\python.exe wordcoutmapper.py" ^
-reducer "C:\Users\venka\anaconda3\pkgs\python-3.9.12-h6244533_0\python.exe wordcoutreducer.py" ^
-input /BDS_Assignment2/word_count_data.txt ^
-output /BDS_Assignment2/result

 hadoop jar C:\hadoop-2.8.0\share\hadoop\tools\lib\hadoop-streaming-2.8.0.jar ^
-files "file:///C:/Q1mapper.py,file:///C:/Q1reducer.py" ^
-mapper " C:\Users\venka\anaconda3\pkgs\python-3.9.12-h6244533_0\python.exe Q1mapper.py" ^
-reducer "C:\Users\venka\anaconda3\pkgs\python-3.9.12-h6244533_0\python.exe Q1reducer.py" ^
-input hdfs://localhost:9001/user/hive/warehouse/bdsassignment.db/ret_table_data ^
-output /BDS_Assignment2/result

# Command to list the contents of the /BDS_Assignment2/result directory:
hadoop fs -ls /BDS_Assignment2/result

# Once the MapReduce job completes, you can view the output using the following command:
hadoop fs -cat /BDS_Assignment2/result/part-00000



# To delete the directory /BDS_Assignment2/result in HDFS,
hadoop fs -rm -r /BDS_Assignment2/result

stop-dfs
stop-yarn




*********************************************************** THANK YOU **************************************************************************



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Friday, March 3, 2023

Install Hive/Derby on top of Hadoop in Windows


To install Hive/Derby on top of Hadoop, you can follow these general steps:

Versions which are compatible are 
Hadoop : 2.8.0
Hive : 2.1.0
Derby : 10.12.1.1

1.Download and install Hadoop: You can download the Hadoop distribution from the Apache Hadoop website (https://hadoop.apache.org/
and follow the installation instructions.

file name : hadoop-2.8.0.tar.gz


2.Download and install Hive: You can download the Hive distribution from the Apache Hive website (https://hive.apache.org/
and follow the installation instructions.
file name : apache-hive-2.1.0-bin.tar.gz


3.Configure Hive to work with Hadoop: In the Hive configuration files, you need to set the location of the Hadoop 
installation and configure other parameters such as the database location and the Hive metastore.
4.Start the Hadoop services: Start the Hadoop services using the start-all.sh script located in the Hadoop bin directory.
Start the Hive services: Start the Hive services using the hive command.
5.Download and install Derby:  You can download the Derby distribution from the Derby website 
and follow the installation instructions.
file name : db-derby-10.12.1.1-bin.tar.gz

Quick commands:

http://localhost:50070/dfshealth.html#tab-overview
http://localhost:8088/cluster
C:\hadoop\hadoop-2.8.0\sbin>start-all.cmd
C:\hive\apache-hive-2.1.0-bin\bin>hive
C:\derby\db-derby-10.12.1.1-bin\bin>startNetworkServer -h 0.0.0.0



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Saturday, February 18, 2023

Makeup - Mid Semester- Questions and answers - Deep Learning - DSECLZG524 - Jan 2023










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Regular - Mid Semester - Deep Learning- questions and answers - DSECLZG524 - 7th Jan 2023