Life Long Programmer's Community Log: 2015-04-19

Quick Javascript Switcher Some website really show ads in very annoying way, so this is a great way ...

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Quick Javascript Switcher
Some website really show ads in very annoying way, so this is a great way to quickly disable javscript(ads) for specific sites
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Quick way to enable/disable Javascript

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The Huffington Post: When You Google 'Why Do Women ...' Some Very Interesting Results Come Up. http:...

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The Huffington Post: When You Google 'Why Do Women ...' Some Very Interesting Results Come Up. http://ift.tt/1EDar3v

When You Google 'Why Do Women...' Some Very Interesting Results Come Up | Sasha Bronner

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Reshared post from Travis True:

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Alice Keeler puts out some great Google resources. She is a must follow on twitter @alicekeeler http://ift.tt/1g73v2l

Graphic created in Google Draw. Access the poster here.

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Search Engine Land: Google Action Cards For Android & Search Integration. http://ift.tt/1eUavJA...

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Search Engine Land: Google Action Cards For Android & Search Integration. http://ift.tt/1bq6Ubt

Google Action Cards For Android & Search Integration

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Ubergizmo: Send Directions From Google From Your Computer To Your Phone. http://ift.tt/1eUavJA...

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Ubergizmo: Send Directions From Google From Your Computer To Your Phone. http://ift.tt/1OmfiKZ

Send Directions From Google From Your Computer To Your Phone

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24.04.2015 00:54

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You love Android—but how well do you really know Android? These power user tips dig deep into your system's hidden crannies, and surface super-cool features you can really use.

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Reshared post from Mickey McFetridge:

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Inside of Google Drive are a plethora of templates available for your use. The question is... Are you and your students using them? Check out the video below to see how to access them!

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The system should detect the abnormal, and prevent this from ever happening. Any charge more than $500...

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The system should detect the abnormal, and prevent this from ever happening.
Any charge more than $500 or $amount/minutes > 5 should be noticed and reported to some team. +Uber

Chances are, whatever mobile device you currently use, you experience battery life issues. This is not an individual or device specific issue and instead i

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Scala implicit Implicit conversions implicit def stringWrapper(s: String) = new RandomAccessSeq[Char...

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Scala implicit
Implicit conversions
implicit def stringWrapper(s: String) =
new RandomAccessSeq[Char] {
def length = s.length
def apply(i: Int) = s.charAt(i)
}
stringWrapper("abc123") exists (_.isDigit)
"abc123" exists (_.isDigit)
Implicit parameters
import JoesPrefs._
Greeter.greet("Joe")
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if such a method misses arguments for its implicit parameters, such arguments will be automatically provided.
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implicit class StringImprovements(val s: String) {
def increment = s.map(c => (c + 1).toChar)
}
import com.alvinalexander.utils.StringUtils._
println("HAL".increment)
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For an implicit class to work, its name must be in scope and unambiguous, like any other implicit value or conversion.
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Saprk DataFrame RDDs are an immutable distributed collection of data. This collection can be of any ...

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Saprk DataFrame
RDDs are an immutable distributed collection of data. This collection can be of any datatype like String, Integer or tuples. For most of the production data, it ends up being the RDD of tuples.
RDD itself does not have any information about schema of the data it contains.
SchemaRDD is an RDD whose elements are Row objects. Along with that it also contain schema of these elements.
SchemaRDD = RDD [Row] + Schema

DataFrame is a distributed collection of data organized in named columns.
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Introducing DataFrames in Spark for Large Scale Data Science
a DataFrame is a distributed collection of data organized into named columns. It is conceptually equivalent to a table in a relational database or a data frame in R/Python, but with richer optimizations under the hood.

Under the Hood: Intelligent Optimization and Code Generation
Before any computation on a DataFrame starts, the Catalyst optimizer compiles the operations that were used to build the DataFrame into a physical plan for execution.
Catalyst applies logical optimizations such as predicate pushdown.

Catalyst compiles operations into physical plans for execution and generates JVM bytecode for those plans that is often more optimized than hand-written code.

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Spark: Simple Page Rank val iters = 10 val lines = sc.textFile("/Users/yyuan/jyuan/src/apache/spark/...

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Spark: Simple Page Rank
val iters = 10
val lines = sc.textFile("/Users/yyuan/jyuan/src/apache/spark/1.3.0/spark-1.3.0/graphx/data/followers.txt", 1)
val links = lines.map{ s =>
val parts = s.split("\\s+")
(parts(0), parts(1))
}.distinct().groupByKey().cache()
var ranks = links.mapValues(v => 1.0) //init value

for (i <- 1 to iters) {
val contribs = links.join(ranks).values.flatMap{ case (urls, rank) =>
val size = urls.size
urls.map(url => (url, rank / size))
}
ranks = contribs.reduceByKey(_ + _).mapValues(0.15 + 0.85 * _)
}

val output = ranks.sortBy( x=>x._2,false).collect()
output.foreach(tup => println(tup._1 + " has rank: " + tup._2 + "."))
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spark/SparkPageRank.scala at master · apache/spark · GitHub

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Hadoop: Page Rank http://ift.tt/1tI7CmB

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Hadoop: Page Rank
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In this tutorial we are going to create a PageRanking for Wikipedia with the use of Hadoop. This was a good hands-on excercise to get started with Hadoop. The page ranking is not a new thing, but a suitable usecase and way cooler than a word counter! The Wikipedia (en) has 3.7M articles at the moment …

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Page Rank A link to a page counts as a vote of support. http://ift.tt/hjdlSb If web...

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Page Rank
A link to a page counts as a vote of support.
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If web surfers who start on a random page have an 85% likelihood of choosing a random link from the page they are currently visiting, and a 15% likelihood of jumping to a page chosen at random from the entire web, they will reach Page E 8.1% of the time.

The PageRank algorithm outputs a probability distribution used to represent the likelihood that a person randomly clicking on links will arrive at any particular page.

Damping factor d 0.85

random surfer model
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what happens to a person (the random surfer) who randomly moves from page to page, either by typing a page name into the address bar or by clicking a link on the current page.

PageRank - Wikipedia, the free encyclopedia

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Google Express: search discounted items/sales/deals +Google Express Sometimes, we feel bored and want...

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Google Express: search discounted items/sales/deals +Google Express

Sometimes, we feel bored and want to check whether there are items discounted items or some great deals.

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