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Understanding Apache Spark's Execution Model Using SparkListeners

Understanding Apache Spark’s Execution Model Using SparkListeners

November 6, 2015/in Big data & Spark /by Jacek Laskowski

When you execute an action on a RDD, Apache Spark runs a job that in turn triggers tasks using DAGScheduler and TaskScheduler, respectively. They are all low-level details that may be often useful to understand when a simple transformation is no longer simple performance-wise and takes ages to complete.

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https://deepsense.ai/wp-content/uploads/2019/02/understanding-apache-sparks-execution-model-using-sparklisteners-part-1.jpg 217 750 Jacek Laskowski https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Jacek Laskowski2015-11-06 12:14:512021-01-05 16:52:30Understanding Apache Spark’s Execution Model Using SparkListeners
Machine Learning for Greater Fire Scene Safety

Machine Learning for Greater Fire Scene Safety

October 22, 2015/in Data science, Machine learning /by Jan Lasek

The lives of brave firemen are threatened during dangerous emergency missions while they try to save other people and their property. In this post I would like to share my experiences and winning strategy for the AAIA’15 Data Mining Competition: Tagging Firefighter Activities at a Fire Scene, in which I took first place.

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https://deepsense.ai/wp-content/uploads/2019/02/machine-learning-greater-fire-scene-safety.jpg 217 750 Jan Lasek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Jan Lasek2015-10-22 11:41:482021-01-05 16:52:35Machine Learning for Greater Fire Scene Safety
Data mining of the votes of Members of Parliament

Data mining of the votes of Members of Parliament

October 22, 2015/in Data science /by Przemyslaw Biecek

7th term of the Sejm has already come to its end. It would be nice to see how have the Members of Polish Parliament voted for these last 4 years! In total they took part in over 6000 votings. Did the representatives of the same clubs voted more similarly to each other? Did the Members of Polish Parliament who changed the clubs they belonged to voted in a different way than the Members of Parliament from their former clubs? Let’s see!

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https://deepsense.ai/wp-content/uploads/2019/02/data-mining-of-the-votes-of-members-of-parliament.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-10-22 09:41:422021-01-05 16:52:39Data mining of the votes of Members of Parliament
Do cats or dogs live longer?

Do cats or dogs live longer?

October 15, 2015/in Data science /by Przemyslaw Biecek

Some time ago our herd has expanded by a guinea pig called Hugo. It turns out that the presence of a pet at home is a great pretext for discussing with children the concepts of randomness, distribution functions and distribution in general.

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https://deepsense.ai/wp-content/uploads/2019/02/Do-cats-or-dogs-live-longer.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-10-15 10:42:402021-01-05 16:52:43Do cats or dogs live longer?
Statistician like a shoemaker

Statistician like a shoemaker

October 9, 2015/in Data science /by Przemyslaw Biecek

Children bring from school strange home assignments, like for example a question: What is your dad’s job similar to? After several hits (a cosmonaut, Formula 1 driver, firefighter) it turns out that the work performed by a statistician is very much similar to the work of a shoemaker. Why?

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https://deepsense.ai/wp-content/uploads/2019/02/Statistician-like-a-shoemaker.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-10-09 08:53:002021-01-05 16:52:47Statistician like a shoemaker
Multilevel classification, Cohen kappa and Krippendorff alpha

Multilevel classification, Cohen kappa and Krippendorff alpha

September 24, 2015/in Data science /by Przemyslaw Biecek

I was facing an interesting problem last week. Playing with data from The Genome Cancer Atlas (full genetic and clinical data for thousands of patients) I was building a classifier that predicts the type of cancer based on sets of genetic signatures.

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https://deepsense.ai/wp-content/uploads/2019/02/Multilevel-classification-Cohen-kappa-and-Krippendorff-alpha.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-09-24 21:38:192021-01-05 16:52:52Multilevel classification, Cohen kappa and Krippendorff alpha
Biplots, correspondence analysis and ggplot2

Biplots, correspondence analysis and ggplot2

September 18, 2015/in Data science /by Przemyslaw Biecek

I was looking for biplots created with the use of ggplot2 library (because they look good and are customisable).
It turns out that there are some nice solutions for PCA (like sinhrks/ggfortify; kassambara/factoextra; vqv/ggbiplot; fawda123/ggord) but I could not find suitable solution for correspondence analysis.
So I create one….

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https://deepsense.ai/wp-content/uploads/2019/02/Biplots-correspondence-analysis-and-ggplot2.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-09-18 21:55:262021-01-05 16:52:56Biplots, correspondence analysis and ggplot2
Are you in favour of abolition of compulsory education for six-year-old children and return to compulsory education for seven-year-old children?

Are you in favour of abolition of compulsory education for six-year-old children and return to compulsory education for seven-year-old children?

September 10, 2015/in Data science /by Przemyslaw Biecek

1st September was just few days ago. After the reform ‘lowering the age at which children start their school education’ the second group of 6 and 7-year-old children started attending the freshmen classes. And since we are in the ‘pre-election’ mode there are some votes about a reform reestablishing the previous age for starting school education.

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https://deepsense.ai/wp-content/uploads/2019/02/Are-you-in-favour-of-abolition-of-compulsory-education-for-six-year-old-children-and-return-to-compulsory-education-for-seven-year-old-children.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-09-10 11:28:232021-01-05 16:53:00Are you in favour of abolition of compulsory education for six-year-old children and return to compulsory education for seven-year-old children?
Diagnosing diabetic retinopathy with deep learning

Diagnosing diabetic retinopathy with deep learning

September 3, 2015/in Data science, Deep learning, Machine learning /by Robert Bogucki

What is the difference between these 2 images? The one on the left has no signs of diabetic retinopathy, while the other one has severe signs of it. If you are not a trained clinician, the chances are, you will find it quite hard to correctly identify the signs of this disease.

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https://deepsense.ai/wp-content/uploads/2019/02/Diagnosing-diabetic-retinopathy-with-deep-learning.jpg 217 750 Robert Bogucki https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Robert Bogucki2015-09-03 16:30:472021-01-05 16:53:05Diagnosing diabetic retinopathy with deep learning
You’re doing it wrong: surveys concerning the referendum which is to take place on 6th September

You’re doing it wrong: surveys concerning the referendum which is to take place on 6th September

August 27, 2015/in Data science /by Przemyslaw Biecek

I recently came across the presentations of the results of the surveys concerning participation in the planned referenda published by the portal Gazeta.pl.
My attention was caught by the diagram presented below which displays a distribution of answers to the question: “Are you going to vote in the referendum scheduled for 6th September?”

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https://deepsense.ai/wp-content/uploads/2019/02/You’re-doing-it-wrong-surveys-concerning-the-referendum-which-is-to-take-place-on-6th-September.jpg 337 1140 Przemyslaw Biecek https://deepsense.ai/wp-content/uploads/2019/04/DS_logo_color.svg Przemyslaw Biecek2015-08-27 09:42:482021-01-05 16:53:12You’re doing it wrong: surveys concerning the referendum which is to take place on 6th September
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